P89LPC920/921/922 8-bit microcontrollers with two-clock 80C51 core 2 kB/4 kB/8 kB 3 V low-power Flash with 256-byte data RAM Rev. 06 — 21 November 2003 Product data 1. General description The P89LPC920/921/922 are single-chip microcontrollers designed for applications demanding high-integration, low cost solutions over a wide range of performance requirements. The P89LPC920/921/922 is based on a high performance processor architecture that executes instructions in two to four clocks, six times the rate of standard 80C51 devices. Many system-level functions have been incorporated into the P89LPC920/921/922 in order to reduce component count, board space, and system cost. 2. Features 2.1 Principal features ■ 2 kB/4 kB/8 kB Flash code memory with 1 kB erasable sectors, 64-byte erasable page size, and single byte erase. ■ 256-byte RAM data memory. ■ Two 16-bit counter/timers. Each timer may be configured to toggle a port output upon timer overflow or to become a PWM output. ■ Real-Time clock that can also be used as a system timer. ■ Two analog comparators with selectable inputs and reference source. ■ Enhanced UART with fractional baud rate generator, break detect, framing error detection, automatic address detection and versatile interrupt capabilities. ■ 400 kHz byte-wide I2C-bus communication port. ■ Configurable on-chip oscillator with frequency range and RC oscillator options (selected by user programmed Flash configuration bits). The RC oscillator option allows operation without external oscillator components. Oscillator options support frequencies from 20 kHz to the maximum operating frequency of 12 MHz. The RC oscillator option is selectable and fine tunable. ■ 2.4 V to 3.6 V VDD operating range. I/O pins are 5 V tolerant (may be pulled up or driven to 5.5 V). ■ 15 I/O pins minimum. Up to 18 I/O pins while using on-chip oscillator and reset options. 2.2 Additional features ■ 20-pin TSSOP and DIP packages. ■ A high performance 80C51 CPU provides instruction cycle times of 167 ns to 333 ns for all instructions except multiply and divide when executing at 12 MHz. This is 6 times the performance of the standard 80C51 running at the same clock frequency. A lower clock frequency for the same performance results in power savings and reduced EMI. P89LPC920/921/922 Philips Semiconductors 8-bit microcontrollers with two-clock 80C51 core ■ In-Application Programming of the Flash code memory. This allows changing the code in a running application. ■ Serial Flash programming allows simple in-circuit production coding. Flash security bits prevent reading of sensitive application programs. ■ Watchdog timer with separate on-chip oscillator, requiring no external components. The watchdog prescaler is selectable from 8 values. ■ Low voltage reset (Brownout detect) allows a graceful system shutdown when power fails. May optionally be configured as an interrupt. ■ Idle and two different Power-down reduced power modes. Improved wake-up from Power-down mode (a low interrupt input starts execution). Typical Power-down current is 1 µA (total Power-down with voltage comparators disabled). ■ Active-LOW reset. On-chip power-on reset allows operation without external reset components. A reset counter and reset glitch suppression circuitry prevent spurious and incomplete resets. A software reset function is also available. ■ Oscillator Fail Detect. The watchdog timer has a separate fully on-chip oscillator allowing it to perform an oscillator fail detect function. ■ Programmable port output configuration options: ◆ quasi-bidirectional, ◆ open drain, ◆ push-pull, ◆ input-only. ■ Port ‘input pattern match’ detect. Port 0 may generate an interrupt when the value of the pins match or do not match a programmable pattern. ■ LED drive capability (20 mA) on all port pins. A maximum limit is specified for the entire chip. ■ Controlled slew rate port outputs to reduce EMI. Outputs have approximately 10 ns minimum ramp times. ■ Only power and ground connections are required to operate the P89LPC920/921/922 when internal reset option is selected. ■ Four interrupt priority levels. ■ Eight keypad interrupt inputs, plus two additional external interrupt inputs. ■ Second data pointer. ■ Schmitt trigger port inputs. ■ Emulation support. © Koninklijke Philips Electronics N.V. 2003. All rights reserved. 9397 750 12285 Product data Rev. 06 — 21 November 2003 2 of 45 P89LPC920/921/922 Philips Semiconductors 8-bit microcontrollers with two-clock 80C51 core 3. Ordering information Table 1: Ordering information Type number Package Name Description Version P89LPC920FDH TSSOP20 plastic thin shrink small outline package; 20 leads; body width 4.4 mm SOT360-1 P89LPC921FDH TSSOP20 plastic thin shrink small outline package; 20 leads; body width 4.4 mm SOT360-1 P89LPC922FDH TSSOP20 plastic thin shrink small outline package; 20 leads; body width 4.4 mm SOT360-1 P89LPC922FN DIP20 plastic dual in-line package; 20 leads (300 mil) SOT146-1 3.1 Ordering options Table 2: Part options Type number Flash memory Temperature range Frequency P89LPC920FDH 2 kB −40 °C to +85 °C 0 to 12 MHz P89LPC921FDH 4 kB −40 °C to +85 °C 0 to 12 MHz P89LPC922FDH 8 kB −40 °C to +85 °C 0 to 12 MHz P89LPC922FN 8 kB −40 °C to +85 °C 0 to 12 MHz © Koninklijke Philips Electronics N.V. 2003. All rights reserved. 9397 750 12285 Product data Rev. 06 — 21 November 2003 3 of 45 P89LPC920/921/922 Philips Semiconductors 8-bit microcontrollers with two-clock 80C51 core 4. Block diagram P89LPC920/921/922 HIGH PERFORMANCE ACCELERATED 2-CLOCK 80C51 CPU 2 kB/4 kB/8 kB CODE FLASH UART INTERNAL BUS 256-BYTE DATA RAM REAL-TIME CLOCK/ SYSTEM TIMER PORT 3 CONFIGURABLE I/Os I2C PORT 1 CONFIGURABLE I/Os TIMER 0 TIMER 1 PORT 0 CONFIGURABLE I/Os WATCHDOG TIMER AND OSCILLATOR KEYPAD INTERRUPT ANALOG COMPARATORS PROGRAMMABLE OSCILLATOR DIVIDER CRYSTAL OR RESONATOR CONFIGURABLE OSCILLATOR CPU CLOCK ON-CHIP RC OSCILLATOR POWER MONITOR (POWER-ON RESET, BROWNOUT RESET) 002aaa410 Fig 1. Block diagram. © Koninklijke Philips Electronics N.V. 2003. All rights reserved. 9397 750 12285 Product data Rev. 06 — 21 November 2003 4 of 45 P89LPC920/921/922 Philips Semiconductors 8-bit microcontrollers with two-clock 80C51 core 5. Pinning information 5.1 Pinning handbook, halfpage 20 P0.1/CIN2B/KBI1 P1.7 2 19 P0.2/CIN2A/KBI2 P1.6 3 18 P0.3/CIN1B/KBI3 RST/P1.5 4 17 P0.4/CIN1A/KBI4 VSS 5 XTAL1/P3.1 6 CLKOUT/XTAL2/P3.0 7 P89LPC920FDH P89LPC921FDH P89LPC922FDH KBI0/CMP2/P0.0 1 16 P0.5/CMPREF/KBI5 15 VDD 14 P0.6/CMP1/KBI6 13 P0.7/T1/KBI7 INT1/P1.4 8 SDA/INT0/P1.3 9 12 P1.0/TXD SCL/T0/P1.2 10 11 P1.1/RXD 002aaa408 Fig 2. TSSOP20 pin configuration. handbook, halfpage 20 P0.1/CIN2B/KBI1 P1.7 2 19 P0.2/CIN2A/KBI2 P1.6 3 18 P0.3/CIN1B/KBI3 RST/P1.5 4 17 P0.4/CIN1A/KBI4 VSS 5 XTAL1/P3.1 6 CLKOUT/XTAL2/P3.0 7 P89LPC922FN KBI0/CMP2/P0.0 1 16 P0.5/CMPREF/KBI5 15 VDD 14 P0.6/CMP1/KBI6 13 P0.7/T1/KBI7 INT1/P1.4 8 SDA/INT0/P1.3 9 12 P1.0/TXD SCL/T0/P1.2 10 11 P1.1/RXD 002aaa407 Fig 3. DIP20 pin configuration. © Koninklijke Philips Electronics N.V. 2003. All rights reserved. 9397 750 12285 Product data Rev. 06 — 21 November 2003 5 of 45 P89LPC920/921/922 Philips Semiconductors 8-bit microcontrollers with two-clock 80C51 core 5.2 Pin description Table 3: Pin description Symbol Pin Type P0.0 - P0.7 1, 20, 19, I/O 18, 17, 16, 14, 13 Description Port 0: Port 0 is an 8-bit I/O port with a user-configurable output type. During reset Port 0 latches are configured in the input only mode with the internal pull-up disabled. The operation of Port 0 pins as inputs and outputs depends upon the port configuration selected. Each port pin is configured independently. Refer to Section 8.12.1 “Port configurations” and Table 8 “DC electrical characteristics” for details. The Keypad Interrupt feature operates with Port 0 pins. All pins have Schmitt triggered inputs. Port 0 also provides various special functions as described below: 1 20 19 18 17 16 14 13 I/O P0.0 — Port 0 bit 0. O CMP2 — Comparator 2 output. I KBI0 — Keyboard input 0. I/O P0.1 — Port 0 bit 1. I CIN2B — Comparator 2 positive input B. I KBI1 — Keyboard input 1. I/O P0.2 — Port 0 bit 2. I CIN2A — Comparator 2 positive input A. I KBI2 — Keyboard input 2. I/O P0.3 — Port 0 bit 3. I CIN1B — Comparator 1 positive input B. I KBI3 — Keyboard input 3. I/O P0.4 — Port 0 bit 4. I CIN1A — Comparator 1 positive input A. I KBI4 — Keyboard input 4. I/O P0.5 — Port 0 bit 5. I CMPREF — Comparator reference (negative) input. I KBI5 — Keyboard input 5. I/O P0.6 — Port 0 bit 6. O CMP1 — Comparator 1 output. I KBI6 — Keyboard input 6. I/O P0.7 — Port 0 bit 7. I/O T1 — Timer/counter 1 external count input or overflow output. I KBI7 — Keyboard input 7. © Koninklijke Philips Electronics N.V. 2003. All rights reserved. 9397 750 12285 Product data Rev. 06 — 21 November 2003 6 of 45 P89LPC920/921/922 Philips Semiconductors 8-bit microcontrollers with two-clock 80C51 core Table 3: Pin description…continued Symbol Pin P1.0 - P1.7 12, 11, 10, I/O, I [1] Port 1: Port 1 is an 8-bit I/O port with a user-configurable output type, except for three 9, 8, 4, 3, pins as noted below. During reset Port 1 latches are configured in the input only mode 2 with the internal pull-up disabled. The operation of the configurable Port 1 pins as inputs and outputs depends upon the port configuration selected. Each of the configurable port pins are programmed independently. Refer to Section 8.12.1 “Port configurations” and Table 8 “DC electrical characteristics” for details. P1.2 - P1.3 are open drain when used as outputs. P1.5 is input only. Type Description All pins have Schmitt triggered inputs. Port 1 also provides various special functions as described below: 12 11 10 9 8 4 I/O P1.0 — Port 1 bit 0. O TXD — Transmitter output for the serial port. I/O P1.1 — Port 1 bit 1. I RXD — Receiver input for the serial port. I/O P1.2 — Port 1 bit 2 (open-drain when used as output). I/O T0 — Timer/counter 0 external count input or overflow output (open-drain when used as output). I/O SCL — I2C serial clock input/output. I/O P1.3 — Port 1 bit 3 (open-drain when used as output). I INT0 — External interrupt 0 input. I/O SDA — I2C serial data input/output. I/O P1.4 — Port 1 bit 4. I INT1 — External interrupt 1 input. I P1.5 — Port 1 bit 5 (input only). I RST — External Reset input (if selected via FLASH configuration). A LOW on this pin resets the microcontroller, causing I/O ports and peripherals to take on their default states, and the processor begins execution at address 0. 3 I/O P1.6 — Port 1 bit 6. 2 I/O P1.7 — Port 1 bit 7. © Koninklijke Philips Electronics N.V. 2003. All rights reserved. 9397 750 12285 Product data Rev. 06 — 21 November 2003 7 of 45 P89LPC920/921/922 Philips Semiconductors 8-bit microcontrollers with two-clock 80C51 core Table 3: Pin description…continued Symbol Pin Type Description P3.0 - P3.1 7, 6 I/O Port 3: Port 3 is an 2-bit I/O port with a user-configurable output type. During reset Port 3 latches are configured in the input only mode with the internal pull-up disabled. The operation of Port 3 pins as inputs and outputs depends upon the port configuration selected. Each port pin is configured independently. Refer to Section 8.12.1 “Port configurations” and Table 8 “DC electrical characteristics” for details. All pins have Schmitt triggered inputs. Port 3 also provides various special functions as described below: 7 6 I/O P3.0 — Port 3 bit 0. O XTAL2 — Output from the oscillator amplifier (when a crystal oscillator option is selected via the FLASH configuration. O CLKOUT — CPU clock divided by 2 when enabled via SFR bit (ENCLK - TRIM.6). It can be used if the CPU clock is the internal RC oscillator, watchdog oscillator or external clock input, except when XTAL1/XTAL2 are used to generate clock source for the real time clock/system timer. I/O P3.1 — Port 3 bit 1. I XTAL1 — Input to the oscillator circuit and internal clock generator circuits (when selected via the FLASH configuration). It can be a port pin if internal RC oscillator or watchdog oscillator is used as the CPU clock source, and if XTAL1/XTAL2 are not used to generate the clock for the real time clock/system timer. VSS 5 I Ground: 0 V reference. VDD 15 I Power Supply: This is the power supply voltage for normal operation as well as Idle and Power Down modes. [1] Input/Output for P1.0-P1.4, P1.6, P1.7. Input for P1.5. 6. Logic symbol XTAL2 XTAL1 PORT 1 CLKOUT VSS P89LPC920/921/922 CMP2 CIN2B CIN2A CIN1B CIN1A CMPREF CMP1 T1 PORT 3 KBI0 KBI1 KBI2 KBI3 KBI4 KBI5 KBI6 KBI7 PORT 0 VDD TxD RxD T0 INT0 INT1 RST SCL SDA 002aaa409 Fig 4. Logic symbol. © Koninklijke Philips Electronics N.V. 2003. All rights reserved. 9397 750 12285 Product data Rev. 06 — 21 November 2003 8 of 45 P89LPC920/921/922 Philips Semiconductors 8-bit microcontrollers with two-clock 80C51 core 7. Special function registers Remark: Special Function Registers (SFRs) accesses are restricted in the following ways: • User must not attempt to access any SFR locations not defined. • Accesses to any defined SFR locations must be strictly for the functions for the SFRs. • SFR bits labeled ‘-’, ‘0’ or ‘1’ can only be written and read as follows: – ‘-’ Unless otherwise specified, must be written with ‘0’, but can return any value when read (even if it was written with ‘0’). It is a reserved bit and may be used in future derivatives. – ‘0’ must be written with ‘0’, and will return a ‘0’ when read. – ‘1’ must be written with ‘1’, and will return a ‘1’ when read. © Koninklijke Philips Electronics N.V. 2003. All rights reserved. 9397 750 12285 Product data Rev. 06 — 21 November 2003 9 of 45 xxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxx x x x xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxx xx xx xxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxx xxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxx x x xxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxx xxx Philips Semiconductors 9397 750 12285 Product data Table 4: Special function registers * indicates SFRs that are bit addressable. Name Description SFR Bit functions and addresses addr. MSB Hex Binary E0H 00 00000000 A2H 00[1] 000000x0 Bit address ACC* AUXR1 Accumulator Auxiliary function register Reset value Bit address E7 E6 E5 LSB E4 E3 E2 E1 E0 CLKLP EBRR ENT1 ENT0 SRST 0 - DPS F7 F6 F5 F4 F3 F2 F1 F0 B register F0H 00 00000000 BRGR0[2] Baud rate generator rate LOW BEH 00 00000000 BRGR1[2] Baud rate generator rate HIGH BFH 00 00000000 BRGCON Baud rate generator control BDH 00 xxxxxx00 CMF1 00[1] xx000000 CMF2 00[1] xx000000 CMP1 Comparator 1 control register ACH - - CE1 CP1 CP2 CN1 CN2 OE1 OE2 SBRGS CO1 CO2 BRGEN Comparator 2 control register ADH CPU clock divide-by-M control 95H 00 00000000 DPTR Data pointer (2 bytes) 83H 00 00000000 DPL CE2 - DIVM Data pointer HIGH - - CMP2 DPH - - 82H 00 00000000 Program Flash address HIGH E7H 00 00000000 FMADRL Program Flash address LOW E6H 00 00000000 FMCON Program Flash control (Read) E4H BUSY - - - HVA HVE SV OI 70 01110000 Program Flash control (Write) E4H FMCMD. 7 FMCMD. 6 FMCMD. 5 FMCMD. 4 FMCMD. 3 FMCMD. 2 FMCMD. 1 FMCMD. 0 FMDATA Program Flash data E5H 00 00000000 I2ADR I2C DBH 00 00000000 I2CON* I2C control register D8H 00 x00000x0 I2DAT I2C DAH I2SCLH Serial clock generator/SCL duty cycle register HIGH 00 00000000 slave address register Bit address data register DDH I2ADR.6 I2ADR.5 I2ADR.4 I2ADR.3 I2ADR.2 I2ADR.1 I2ADR.0 GC DF DE DD DC DB DA D9 D8 - I2EN STA STO SI AA - CRSEL P89LPC920/921/922 10 of 45 © Koninklijke Philips Electronics N.V. 2003. All rights reserved. Data pointer LOW FMADRH 8-bit microcontrollers with two-clock 80C51 core Rev. 06 — 21 November 2003 B* xxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxx x x x xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxx xx xx xxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxx xxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxx x x xxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxx xxx Name Description SFR Bit functions and addresses addr. MSB I2SCLL Serial clock generator/SCL duty cycle register LOW DCH I2STAT I2C status register D9H Bit address IEN0* Interrupt enable 0 IEN1* Interrupt enable 1 A8H Bit address E8H Bit address IP0* Interrupt priority 0 HIGH B8H B7H Bit address IP1* Interrupt priority 1 F8H Reset value LSB Hex Binary 00 00000000 F8 11111000 00[1] 00000000 00[1] 00x00000 STA.4 STA.3 STA.2 STA.1 STA.0 0 0 0 AF AE AD AC AB AA A9 A8 EA EWDRT EBO ES/ESR ET1 EX1 ET0 EX0 EF EE ED EC EB EA E9 E8 - EST - - - EC EKBI EI2C BF BE BD BC BB BA B9 B8 - PWDRT PBO PS/PSR PT1 PX1 PT0 PX0 00[1] x0000000 00[1] x0000000 - PWDRT H PBOH PSH/ PSRH PT1H PX1H PT0H PX0H FF FE FD FC FB FA F9 F8 - PST - - - PC PKBI PI2C 00[1] 00x00000 00x00000 Interrupt priority 1 HIGH F7H - PSTH - - - PCH PKBIH PI2CH KBCON Keypad control register 94H - - - - - - PATN _SEL KBIF 00[1] xxxxxx00 KBMASK Keypad interrupt mask register 86H 00 00000000 KBPATN Keypad pattern register FF 11111111 93H Bit address P0* Port 0 80H 11 of 45 © Koninklijke Philips Electronics N.V. 2003. All rights reserved. Bit address P1* Port 1 90H Bit address 87 86 85 84 83 82 81 80 T1/KB7 CMP1 /KB6 CMPREF /KB5 CIN1A /KB4 CIN1B /KB3 CIN2A /KB2 CIN2B /KB1 CMP2 /KB0 97 96 95 94 93 92 91 90 - - RST INT1 INT0/ SDA T0/SCL RXD TXD B7 B6 B5 B4 B3 B2 B1 B0 - - - - - - XTAL1 XTAL2 [1] [1] [1] P3* Port 3 B0H P0M1 Port 0 output mode 1 84H (P0M1.7) (P0M1.6) (P0M1.5) (P0M1.4) (P0M1.3) (P0M1.2) (P0M1.1) (P0M1.0) FF 11111111 P0M2 Port 0 output mode 2 85H (P0M2.7) (P0M2.6) (P0M2.5) (P0M2.4) (P0M2.3) (P0M2.2) (P0M2.1) (P0M2.0) 00 00000000 P1M1 Port 1 output mode 1 91H (P1M1.7) (P1M1.6) - (P1M1.4) (P1M1.3) (P1M1.2) (P1M1.1) (P1M1.0) D3[1] 11x1xx11 P89LPC920/921/922 IP1H 00[1] 8-bit microcontrollers with two-clock 80C51 core Rev. 06 — 21 November 2003 IP0H Interrupt priority 0 Philips Semiconductors 9397 750 12285 Product data Table 4: Special function registers…continued * indicates SFRs that are bit addressable. xxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxx x x x xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxx xx xx xxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxx xxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxx x x xxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxx xxx Name Description SFR Bit functions and addresses addr. MSB P1M2 Port 1 output mode 2 92H P3M1 Port 3 output mode 1 B1H (P1M2.7) (P1M2.6) - - - Reset value LSB Hex Binary 00[1] 00x0xx00 - (P3M1.1) (P3M1.0) 03[1] xxxxxx11 (P3M2.1) (P3M2.0) 00[1] xxxxxx00 PMOD1 00 00000000 00[1] 00000000 (P1M2.4) (P1M2.3) (P1M2.2) (P1M2.1) (P1M2.0) - - P3M2 Port 3 output mode 2 B2H - - - - - - PCON Power control register 87H SMOD1 SMOD0 BOPD BOI GF1 GF0 PCONA Power control register A B5H Bit address PMOD0 RTCPD - VCPD - I2PD - SPD - D7 D6 D5 D4 D3 D2 D1 D0 F0 RS1 RS0 OV F1 P 00H 00000000 - 00H xx00000x Program status word D0H CY AC PT0AD Port 0 digital input disable F6H - - RSTSRC Reset source register DFH - - BOF POF R_BK R_WD R_SF R_EX RTCCON Real-time clock control D1H RTCF RTCS1 RTCS0 - - - ERTC RTCEN RTCH Real-time clock register HIGH D2H 00[6] 00000000 RTCL Real-time clock register LOW D3H 00[6] 00000000 SADDR Serial port address register A9H 00 00000000 SADEN Serial port address enable B9H 00 00000000 SBUF Serial Port data buffer register 99H xx xxxxxxxx 9F 9E 9D 9C 9B 9A 99 98 SCON* Serial port control 98H SM0/FE SM1 SM2 REN TB8 RB8 TI RI 00 00000000 SSTAT Serial port extended status register BAH DBMOD INTLO CIDIS DBISEL FE BR OE STINT 00 00000000 SP Stack pointer 81H 07 00000111 TAMOD Timer 0 and 1 auxiliary mode 00 xxx0xxx0 00 00000000 - - - T1M2 - - - T0M2 8F 8E 8D 8C 8B 8A 89 88 TF1 TR1 TF0 TR0 IE1 IT1 IE0 IT0 [3] 60[1][6] TCON* Timer 0 and 1 control 88H TH0 Timer 0 HIGH 8CH 00 00000000 TH1 Timer 1 HIGH 8DH 00 00000000 TL0 Timer 0 LOW 8AH 00 00000000 TL1 Timer 1 LOW 8BH 00 00000000 TMOD Timer 0 and 1 mode 89H 00 00000000 T1GATE T1C/T T1M1 T1M0 T0GATE T0C/T T0M1 T0M0 P89LPC920/921/922 12 of 45 © Koninklijke Philips Electronics N.V. 2003. All rights reserved. 8FH Bit address PT0AD.5 PT0AD.4 PT0AD.3 PT0AD.2 PT0AD.1 8-bit microcontrollers with two-clock 80C51 core Rev. 06 — 21 November 2003 PSW* Bit address Philips Semiconductors 9397 750 12285 Product data Table 4: Special function registers…continued * indicates SFRs that are bit addressable. xxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxx x x x xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxx xx xx xxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxx xxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxx x x xxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxx xxx Name Description SFR Bit functions and addresses addr. MSB Reset value LSB Hex Binary TRIM Internal oscillator trim register 96H - ENCLK TRIM.5 TRIM.4 TRIM.3 TRIM.2 TRIM.1 TRIM.0 [5] [6] WDCON Watchdog control register A7H PRE2 PRE1 PRE0 - - WDRUN WDTOF WDCLK [4] [6] WDL Watchdog load C1H WFEED1 Watchdog feed 1 C2H WFEED2 Watchdog feed 2 C3H [1] [2] [3] [4] FF 11111111 All ports are in input only (high impedance) state after power-up. BRGR1 and BRGR0 must only be written if BRGEN in BRGCON SFR is ‘0’. If any are written while BRGEN = 1, the result is unpredictable. The RSTSRC register reflects the cause of the P89LPC920/921/922 reset. Upon a power-up reset, all reset source flags are cleared except POF and BOF; the power-on reset value is xx110000. After reset, the value is 111001x1, i.e., PRE2-PRE0 are all ‘1’, WDRUN = 1 and WDCLK = 1. WDTOF bit is ‘1’ after watchdog reset and is ‘0’ after power-on reset. Other resets will not affect WDTOF. On power-on reset, the TRIM SFR is initialized with a factory preprogrammed value. Other resets will not cause initialization of the TRIM register. The only reset source that affects these SFRs is power-on reset. P89LPC920/921/922 13 of 45 © Koninklijke Philips Electronics N.V. 2003. All rights reserved. 8-bit microcontrollers with two-clock 80C51 core Rev. 06 — 21 November 2003 [5] [6] Philips Semiconductors 9397 750 12285 Product data Table 4: Special function registers…continued * indicates SFRs that are bit addressable. P89LPC920/921/922 Philips Semiconductors 8-bit microcontrollers with two-clock 80C51 core 8. Functional description Remark: Please refer to the P89LPC920/921/922 User’s Manual for a more detailed functional description. 8.1 Enhanced CPU The P89LPC920/921/922 uses an enhanced 80C51 CPU which runs at 6 times the speed of standard 80C51 devices. A machine cycle consists of two CPU clock cycles, and most instructions execute in one or two machine cycles. 8.2 Clocks 8.2.1 Clock definitions The P89LPC920/921/922 device has several internal clocks as defined below: OSCCLK — Input to the DIVM clock divider. OSCCLK is selected from one of four clock sources (see Figure 5) and can also be optionally divided to a slower frequency (see Section 8.7 “CPU Clock (CCLK) modification: DIVM register”). Note: fOSC is defined as the OSCCLK frequency. CCLK — CPU clock; output of the clock divider. There are two CCLK cycles per machine cycle, and most instructions are executed in one to two machine cycles (two or four CCLK cycles). RCCLK — The internal 7.373 MHz RC oscillator output. PCLK — Clock for the various peripheral devices and is CCLK/2 8.2.2 CPU clock (OSCCLK) The P89LPC920/921/922 provides several user-selectable oscillator options in generating the CPU clock. This allows optimization for a range of needs from high precision to lowest possible cost. These options are configured when the FLASH is programmed and include an on-chip watchdog oscillator, an on-chip RC oscillator, an oscillator using an external crystal, or an external clock source. The crystal oscillator can be optimized for low, medium, or high frequency crystals covering a range from 20 kHz to 12 MHz. 8.2.3 Low speed oscillator option This option supports an external crystal in the range of 20 kHz to 100 kHz. Ceramic resonators are also supported in this configuration. 8.2.4 Medium speed oscillator option This option supports an external crystal in the range of 100 kHz to 4 MHz. Ceramic resonators are also supported in this configuration. 8.2.5 High speed oscillator option This option supports an external crystal in the range of 4 MHz to 12 MHz. Ceramic resonators are also supported in this configuration. © Koninklijke Philips Electronics N.V. 2003. All rights reserved. 9397 750 12285 Product data Rev. 06 — 21 November 2003 14 of 45 P89LPC920/921/922 Philips Semiconductors 8-bit microcontrollers with two-clock 80C51 core 8.2.6 Clock output The P89LPC920/921/922 supports a user-selectable clock output function on the XTAL2/CLKOUT pin when crystal oscillator is not being used. This condition occurs if another clock source has been selected (on-chip RC oscillator, watchdog oscillator, external clock input on X1) and if the Real-Time clock is not using the crystal oscillator as its clock source. This allows external devices to synchronize to the P89LPC920/921/922. This output is enabled by the ENCLK bit in the TRIM register. The frequency of this clock output is 1⁄2 that of the CCLK. If the clock output is not needed in Idle mode, it may be turned off prior to entering Idle, saving additional power. 8.3 On-chip RC oscillator option The P89LPC920/921/922 has a 6-bit TRIM register that can be used to tune the frequency of the RC oscillator. During reset, the TRIM value is initialized to a factory pre-programmed value to adjust the oscillator frequency to 7.373 MHz, ±1% at room temperature. End-user applications can write to the Trim register to adjust the on-chip RC oscillator to other frequencies. 8.4 Watchdog oscillator option The watchdog has a separate oscillator which has a frequency of 400 kHz. This oscillator can be used to save power when a high clock frequency is not needed. 8.5 External clock input option In this configuration, the processor clock is derived from an external source driving the XTAL1/P3.1 pin. The rate may be from 0 Hz up to 12 MHz. The XTAL2/P3.0 pin may be used as a standard port pin or a clock output. XTAL1 XTAL2 High freq. Med. freq. Low freq. RTC OSCCLK DIVM RC OSCILLATOR CCLK CPU ÷2 (7.3728 MHz) WDT WATCHDOG OSCILLATOR (400 kHz) PCLK TIMER 0 and TIMER 1 I2C BAUD RATE GENERATOR UART 002aaa424 Fig 5. Block diagram of oscillator control. © Koninklijke Philips Electronics N.V. 2003. All rights reserved. 9397 750 12285 Product data Rev. 06 — 21 November 2003 15 of 45 P89LPC920/921/922 Philips Semiconductors 8-bit microcontrollers with two-clock 80C51 core 8.6 CPU Clock (CCLK) wake-up delay The P89LPC920/921/922 has an internal wake-up timer that delays the clock until it stabilizes depending to the clock source used. If the clock source is any of the three crystal selections (low, medium and high frequencies) the delay is 992 OSCCLK cycles plus 60 to 100 µs. If the clock source is either the internal RC oscillator, watchdog oscillator, or external clock, the delay is 224 OSCCLK cycles plus 60 to 100 µs. 8.7 CPU Clock (CCLK) modification: DIVM register The OSCCLK frequency can be divided down up to 510 times by configuring a dividing register, DIVM, to generate CCLK. This feature makes it possible to temporarily run the CPU at a lower rate, reducing power consumption. By dividing the clock, the CPU can retain the ability to respond to events that would not exit Idle mode by executing its normal program at a lower rate. This can also allow bypassing the oscillator start-up time in cases where Power-down mode would otherwise be used. The value of DIVM may be changed by the program at any time without interrupting code execution. 8.8 Low power select The P89LPC920/921/922 is designed to run at 12 MHz (CCLK) maximum. However, if CCLK is 8 MHz or slower, the CLKLP SFR bit (AUXR1.7) can be set to ‘1’ to lower the power consumption further. On any reset, CLKLP is ‘0’ allowing highest performance access. This bit can then be set in software if CCLK is running at 8 MHz or slower. 8.9 Memory organization The various P89LPC920/921/922 memory spaces are as follows: • DATA 128 bytes of internal data memory space (00h:7Fh) accessed via direct or indirect addressing, using instruction other than MOVX and MOVC. All or part of the Stack may be in this area. • IDATA Indirect Data. 256 bytes of internal data memory space (00h:FFh) accessed via indirect addressing using instructions other than MOVX and MOVC. All or part of the Stack may be in this area. This area includes the DATA area and the 128 bytes immediately above it. • SFR Special Function Registers. Selected CPU registers and peripheral control and status registers, accessible only via direct addressing. • CODE 64 kB of Code memory space, accessed as part of program execution and via the MOVC instruction. The P89LPC920/921/922 has 2 kB/4 kB/8 kB of on-chip Code memory. © Koninklijke Philips Electronics N.V. 2003. All rights reserved. 9397 750 12285 Product data Rev. 06 — 21 November 2003 16 of 45 P89LPC920/921/922 Philips Semiconductors 8-bit microcontrollers with two-clock 80C51 core 8.10 Data RAM arrangement The 256 bytes of on-chip RAM are organized as shown in Table 5. Table 5: On-chip data memory usages Type Data RAM Size (bytes) DATA Memory that can be addressed directly and indirectly 128 IDATA Memory that can be addressed indirectly 256 8.11 Interrupts The P89LPC920/921/922 uses a four priority level interrupt structure. This allows great flexibility in controlling the handling of the many interrupt sources. The P89LPC920/921/922 supports 12 interrupt sources: external interrupts 0 and 1, timers 0 and 1, serial port Tx, serial port Rx, combined serial port Rx/Tx, brownout detect, watchdog/real-time clock, I2C, keyboard, and comparators 1 and 2. Each interrupt source can be individually enabled or disabled by setting or clearing a bit in the interrupt enable registers IEN0 or IEN1. The IEN0 register also contains a global disable bit, EA, which disables all interrupts. Each interrupt source can be individually programmed to one of four priority levels by setting or clearing bits in the interrupt priority registers IP0, IP0H, IP1, and IP1H. An interrupt service routine in progress can be interrupted by a higher priority interrupt, but not by another interrupt of the same or lower priority. The highest priority interrupt service cannot be interrupted by any other interrupt source. If two requests of different priority levels are pending at the start of an instruction, the request of higher priority level is serviced. If requests of the same priority level are pending at the start of an instruction, an internal polling sequence determines which request is serviced. This is called the arbitration ranking. Note that the arbitration ranking is only used to resolve pending requests of the same priority level. 8.11.1 External interrupt inputs The P89LPC920/921/922 has two external interrupt inputs as well as the Keypad Interrupt function. The two interrupt inputs are identical to those present on the standard 80C51 microcontrollers. These external interrupts can be programmed to be level-triggered or edge-triggered by setting or clearing bit IT1 or IT0 in Register TCON. In edge-triggered mode if successive samples of the INTn pin show a HIGH in one cycle and a LOW in the next cycle, the interrupt request flag IEn in TCON is set, causing an interrupt request. If an external interrupt is enabled when the P89LPC920/921/922 is put into Power-down or Idle mode, the interrupt will cause the processor to wake-up and resume operation. Refer to Section 8.14 “Power reduction modes” for details. © Koninklijke Philips Electronics N.V. 2003. All rights reserved. 9397 750 12285 Product data Rev. 06 — 21 November 2003 17 of 45 P89LPC920/921/922 Philips Semiconductors 8-bit microcontrollers with two-clock 80C51 core IE0 EX0 IE1 EX1 BOPD EBO RTCF ERTC (RTCCON.1) WDOVF WAKE-UP (IF IN POWER-DOWN) KBIF EKBI EWDRT CMF2 CMF1 EC EA (IE0.7) TF0 ET0 TF1 ET1 TI & RI/RI ES/ESR INTERRUPT TO CPU TI EST SI EI2C 002aaa418 Fig 6. Interrupt sources, interrupt enables, and power-down wake-up sources. 8.12 I/O ports The P89LPC920/921/922 has three I/O ports: Port 0, Port 1, and Port 3. Ports 0 and 1 are 8-bit ports, and Port 3 is a 2-bit port. The exact number of I/O pins available depend upon the clock and reset options chosen, as shown in Table 6. Table 6: Number of I/O pins available Clock source On-chip oscillator or watchdog oscillator External clock input Low/medium/high speed oscillator (external crystal or resonator) 8.12.1 Reset option Number of I/O pins (20-pin package) No external reset (except during power-up) 18 External RST pin supported 17 No external reset (except during power-up) 17 External RST pin supported 16 No external reset (except during power-up) 16 External RST pin supported 15 Port configurations All but three I/O port pins on the P89LPC920/921/922 may be configured by software to one of four types on a bit-by-bit basis. These are: quasi-bidirectional (standard 80C51 port outputs), push-pull, open drain, and input-only. Two configuration registers for each port select the output type for each port pin. P1.5 (RST) can only be an input and cannot be configured. P1.2 (SCL/T0) and P1.3 (SDA/INT0) may only be configured to be either input-only or open-drain. © Koninklijke Philips Electronics N.V. 2003. All rights reserved. 9397 750 12285 Product data Rev. 06 — 21 November 2003 18 of 45 P89LPC920/921/922 Philips Semiconductors 8-bit microcontrollers with two-clock 80C51 core 8.12.2 Quasi-bidirectional output configuration Quasi-bidirectional output type can be used as both an input and output without the need to reconfigure the port. This is possible because when the port outputs a logic HIGH, it is weakly driven, allowing an external device to pull the pin LOW. When the pin is driven LOW, it is driven strongly and able to sink a fairly large current. These features are somewhat similar to an open-drain output except that there are three pull-up transistors in the quasi-bidirectional output that serve different purposes. The P89LPC920/921/922 is a 3 V device, but the pins are 5 V-tolerant. In quasi-bidirectional mode, if a user applies 5 V on the pin, there will be a current flowing from the pin to VDD, causing extra power consumption. Therefore, applying 5 V in quasi-bidirectional mode is discouraged. A quasi-bidirectional port pin has a Schmitt-triggered input that also has a glitch suppression circuit. 8.12.3 Open-drain output configuration The open-drain output configuration turns off all pull-ups and only drives the pull-down transistor of the port driver when the port latch contains a logic ‘0’. To be used as a logic output, a port configured in this manner must have an external pull-up, typically a resistor tied to VDD. An open-drain port pin has a Schmitt-triggered input that also has a glitch suppression circuit. 8.12.4 Input-only configuration The input-only port configuration has no output drivers. It is a Schmitt-triggered input that also has a glitch suppression circuit. 8.12.5 Push-pull output configuration The push-pull output configuration has the same pull-down structure as both the open-drain and the quasi-bidirectional output modes, but provides a continuous strong pull-up when the port latch contains a logic ‘1’. The push-pull mode may be used when more source current is needed from a port output. A push-pull port pin has a Schmitt-triggered input that also has a glitch suppression circuit. 8.12.6 Port 0 analog functions The P89LPC920/921/922 incorporates two Analog Comparators. In order to give the best analog function performance and to minimize power consumption, pins that are being used for analog functions must have the digital outputs and digital inputs disabled. Digital outputs are disabled by putting the port output into the Input-Only (high impedance) mode as described in Section 8.12.4. Digital inputs on Port 0 may be disabled through the use of the PT0AD register, bits 1:5. On any reset, PT0AD1:5 defaults to ‘0’s to enable digital functions. © Koninklijke Philips Electronics N.V. 2003. All rights reserved. 9397 750 12285 Product data Rev. 06 — 21 November 2003 19 of 45 P89LPC920/921/922 Philips Semiconductors 8-bit microcontrollers with two-clock 80C51 core 8.12.7 Additional port features After power-up, all pins are in Input-Only mode. Please note that this is different from the LPC76x series of devices. • After power-up, all I/O pins except P1.5, may be configured by software. • Pin P1.5 is input only. Pins P1.2 and P1.3 and are configurable for either input-only or open-drain. Every output on the P89LPC920/921/922 has been designed to sink typical LED drive current. However, there is a maximum total output current for all ports which must not be exceeded. Please refer to Table 8 “DC electrical characteristics” for detailed specifications. All ports pins that can function as an output have slew rate controlled outputs to limit noise generated by quickly switching output signals. The slew rate is factory-set to approximately 10 ns rise and fall times. 8.13 Power monitoring functions The P89LPC920/921/922 incorporates power monitoring functions designed to prevent incorrect operation during initial power-up and power loss or reduction during operation. This is accomplished with two hardware functions: Power-on Detect and Brownout detect. 8.13.1 Brownout detection The Brownout detect function determines if the power supply voltage drops below a certain level. The default operation is for a Brownout detection to cause a processor reset, however it may alternatively be configured to generate an interrupt. Brownout detection may be enabled or disabled in software. If Brownout detection is enabled, the operating voltage range for VDD is 2.7 V to 3.6 V, and the brownout condition occurs when VDD falls below the brownout trip voltage, VBO (see Table 8 “DC electrical characteristics”), and is negated when VDD rises above VBO. If brownout detection is disabled, the operating voltage range for VDD is 2.4 V to 3.6 V. If the P89LPC920/921/922 device is to operate with a power supply that can be below 2.7 V, BOE should be left in the unprogrammed state so that the device can operate at 2.4 V, otherwise continuous brownout reset may prevent the device from operating. For correct activation of Brownout detect, the VDD rise and fall times must be observed. Please see Table 8 “DC electrical characteristics” for specifications. 8.13.2 Power-on detection The Power-on Detect has a function similar to the Brownout detect, but is designed to work as power comes up initially, before the power supply voltage reaches a level where Brownout detect can work. The POF flag in the RSTSRC register is set to indicate an initial power-up condition. The POF flag will remain set until cleared by software. © Koninklijke Philips Electronics N.V. 2003. All rights reserved. 9397 750 12285 Product data Rev. 06 — 21 November 2003 20 of 45 P89LPC920/921/922 Philips Semiconductors 8-bit microcontrollers with two-clock 80C51 core 8.14 Power reduction modes The P89LPC920/921/922 supports three different power reduction modes. These modes are Idle mode, Power-down mode, and total Power-down mode. 8.14.1 Idle mode Idle mode leaves peripherals running in order to allow them to activate the processor when an interrupt is generated. Any enabled interrupt source or reset may terminate Idle mode. 8.14.2 Power-down mode The Power-down mode stops the oscillator in order to minimize power consumption. The P89LPC920/921/922 exits Power-down mode via any reset, or certain interrupts. In Power-down mode, the power supply voltage may be reduced to the RAM keep-alive voltage VRAM. This retains the RAM contents at the point where Power-down mode was entered. SFR contents are not guaranteed after VDD has been lowered to VRAM, therefore it is highly recommended to wake up the processor via reset in this case. VDD must be raised to within the operating range before the Power-down mode is exited. Some chip functions continue to operate and draw power during Power-down mode, increasing the total power used during Power-down. These include: Brownout detect, Watchdog Timer, Comparators (note that Comparators can be powered-down separately), and Real-Time Clock (RTC)/System Timer. The internal RC oscillator is disabled unless both the RC oscillator has been selected as the system clock AND the RTC is enabled. 8.14.3 Total Power-down mode This is the same as Power-down mode except that the brownout detection circuitry and the voltage comparators are also disabled to conserve additional power. The internal RC oscillator is disabled unless both the RC oscillator has been selected as the system clock and the RTC is enabled. If the internal RC oscillator is used to clock the RTC during Power-down, there will be high power consumption. Please use an external low frequency clock to achieve low power with the Real-Time Clock running during Power-down. 8.15 Reset The P1.5/RST pin can function as either an active-LOW reset input or as a digital input, P1.5. The RPE (Reset Pin Enable) bit in UCFG1, when set to ‘1’, enables the external reset input function on P1.5. When cleared, P1.5 may be used as an input pin. Remark: During a power-up sequence, the RPE selection is overridden and this pin will always function as a reset input. An external circuit connected to this pin should not hold this pin LOW during a power-on sequence as this will keep the device in reset. After power-up this input will function either as an external reset input or as a digital input as defined by the RPE bit. Only a power-up reset will temporarily override the selection defined by RPE bit. Other sources of reset will not override the RPE bit. © Koninklijke Philips Electronics N.V. 2003. All rights reserved. 9397 750 12285 Product data Rev. 06 — 21 November 2003 21 of 45 P89LPC920/921/922 Philips Semiconductors 8-bit microcontrollers with two-clock 80C51 core Remark: During a power cycle, VDD must fall below VPOR (see Table 8 “DC electrical characteristics” on page 35) before power is reapplied, in order to ensure a power-on reset. Reset can be triggered from the following sources: • • • • • • External reset pin (during power-up or if user configured via UCFG1); Power-on detect; Brownout detect; Watchdog Timer; Software reset; UART break character detect reset. For every reset source, there is a flag in the Reset Register, RSTSRC. The user can read this register to determine the most recent reset source. These flag bits can be cleared in software by writing a ‘0’ to the corresponding bit. More than one flag bit may be set: • During a power-on reset, both POF and BOF are set but the other flag bits are cleared. • For any other reset, previously set flag bits that have not been cleared will remain set. 8.15.1 Reset vector Following reset, the P89LPC920/921/922 will fetch instructions from either address 0000h or the Boot address. The Boot address is formed by using the Boot Vector as the high byte of the address and the low byte of the address = 00h. The Boot address will be used if a UART break reset occurs, or the non-volatile Boot Status bit (BOOTSTAT.0) = 1, or the device is forced into ISP mode during power-on (see P89LPC920/921/922 User’s Manual). Otherwise, instructions will be fetched from address 0000H. 8.16 Timers/counters 0 and 1 The P89LPC920/921/922 has two general purpose counter/timers which are upward compatible with the standard 80C51 Timer 0 and Timer 1. Both can be configured to operate either as timers or event counter. An option to automatically toggle the T0 and/or T1 pins upon timer overflow has been added. In the ‘Timer’ function, the register is incremented every machine cycle. In the ‘Counter’ function, the register is incremented in response to a 1-to-0 transition at its corresponding external input pin, T0 or T1. In this function, the external input is sampled once during every machine cycle. Timer 0 and Timer 1 have five operating modes (modes 0, 1, 2, 3 and 6). Modes 0, 1, 2 and 6 are the same for both Timers/Counters. Mode 3 is different. © Koninklijke Philips Electronics N.V. 2003. All rights reserved. 9397 750 12285 Product data Rev. 06 — 21 November 2003 22 of 45 P89LPC920/921/922 Philips Semiconductors 8-bit microcontrollers with two-clock 80C51 core 8.16.1 Mode 0 Putting either Timer into Mode 0 makes it look like an 8048 Timer, which is an 8-bit Counter with a divide-by-32 prescaler. In this mode, the Timer register is configured as a 13-bit register. Mode 0 operation is the same for Timer 0 and Timer 1. 8.16.2 Mode 1 Mode 1 is the same as Mode 0, except that all 16 bits of the timer register are used. 8.16.3 Mode 2 Mode 2 configures the Timer register as an 8-bit Counter with automatic reload. Mode 2 operation is the same for Timer 0 and Timer 1. 8.16.4 Mode 3 When Timer 1 is in Mode 3 it is stopped. Timer 0 in Mode 3 forms two separate 8-bit counters and is provided for applications that require an extra 8-bit timer. When Timer 1 is in Mode 3 it can still be used by the serial port as a baud rate generator. 8.16.5 Mode 6 In this mode, the corresponding timer can be changed to a PWM with a full period of 256 timer clocks. 8.16.6 Timer overflow toggle output Timers 0 and 1 can be configured to automatically toggle a port output whenever a timer overflow occurs. The same device pins that are used for the T0 and T1 count inputs are also used for the timer toggle outputs. The port outputs will be a logic 1 prior to the first timer overflow when this mode is turned on. 8.17 Real-Time clock/system timer The P89LPC920/921/922 has a simple Real-Time clock that allows a user to continue running an accurate timer while the rest of the device is powered-down. The Real-Time clock can be a wake-up or an interrupt source. The Real-Time clock is a 23-bit down counter comprised of a 7-bit prescaler and a 16-bit loadable down counter. When it reaches all ‘0’s, the counter will be reloaded again and the RTCF flag will be set. The clock source for this counter can be either the CPU clock (CCLK) or the XTAL oscillator, provided that the XTAL oscillator is not being used as the CPU clock. If the XTAL oscillator is used as the CPU clock, then the RTC will use CCLK as its clock source. Only power-on reset will reset the Real-Time clock and its associated SFRs to the default state. 8.18 UART The P89LPC920/921/922 has an enhanced UART that is compatible with the conventional 80C51 UART except that Timer 2 overflow cannot be used as a baud rate source. The P89LPC920/921/922 does include an independent Baud Rate Generator. The baud rate can be selected from the oscillator (divided by a constant), Timer 1 overflow, or the independent Baud Rate Generator. In addition to the baud rate generation, enhancements over the standard 80C51 UART include Framing Error detection, automatic address recognition, selectable double buffering and several interrupt options.The UART can be operated in 4 modes: shift register, 8-bit UART, 9-bit UART, and CPU clock/32 or CPU clock/16. © Koninklijke Philips Electronics N.V. 2003. All rights reserved. 9397 750 12285 Product data Rev. 06 — 21 November 2003 23 of 45 P89LPC920/921/922 Philips Semiconductors 8-bit microcontrollers with two-clock 80C51 core 8.18.1 Mode 0 Serial data enters and exits through RxD. TxD outputs the shift clock. 8 bits are transmitted or received, LSB first. The baud rate is fixed at 1⁄16 of the CPU clock frequency. 8.18.2 Mode 1 10 bits are transmitted (through TxD) or received (through RxD): a start bit (logical ‘0’), 8 data bits (LSB first), and a stop bit (logical ‘1’). When data is received, the stop bit is stored in RB8 in Special Function Register SCON. The baud rate is variable and is determined by the Timer 1 overflow rate or the Baud Rate Generator (described in Section 8.18.5 “Baud rate generator and selection”). 8.18.3 Mode 2 11 bits are transmitted (through TxD) or received (through RxD): start bit (logical ‘0’), 8 data bits (LSB first), a programmable 9th data bit, and a stop bit (logical ‘1’). When data is transmitted, the 9th data bit (TB8 in SCON) can be assigned the value of ‘0’ or ‘1’. Or, for example, the parity bit (P, in the PSW) could be moved into TB8. When data is received, the 9th data bit goes into RB8 in Special Function Register SCON, while the stop bit is not saved. The baud rate is programmable to either 1⁄16 or 1⁄32 of the CPU clock frequency, as determined by the SMOD1 bit in PCON. 8.18.4 Mode 3 11 bits are transmitted (through TxD) or received (through RxD): a start bit (logical ‘0’), 8 data bits (LSB first), a programmable 9th data bit, and a stop bit (logical ‘1’). In fact, Mode 3 is the same as Mode 2 in all respects except baud rate. The baud rate in Mode 3 is variable and is determined by the Timer 1 overflow rate or the Baud Rate Generator (described in Section 8.18.5 “Baud rate generator and selection”). 8.18.5 Baud rate generator and selection The P89LPC920/921/922 enhanced UART has an independent Baud Rate Generator. The baud rate is determined by a baud-rate preprogrammed into the BRGR1 and BRGR0 SFRs which together form a 16-bit baud rate divisor value that works in a similar manner as Timer 1 but is much more accurate. If the baud rate generator is used, Timer 1 can be used for other timing functions. The UART can use either Timer 1 or the baud rate generator output (see Figure 7). Note that Timer T1 is further divided by 2 if the SMOD1 bit (PCON.7) is set. The independent Baud Rate Generator uses OSCCLK. Timer 1 Overflow (PCLK-based) SMOD1 = 1 ¸2 SBRGS = 0 Baud Rate Modes 1 and 3 SMOD1 = 0 Baud Rate Generator (CCLK-based) SBRGS = 1 002aaa419 Fig 7. Baud rate sources for UART (Modes 1, 3). © Koninklijke Philips Electronics N.V. 2003. All rights reserved. 9397 750 12285 Product data Rev. 06 — 21 November 2003 24 of 45 P89LPC920/921/922 Philips Semiconductors 8-bit microcontrollers with two-clock 80C51 core 8.18.6 Framing error Framing error is reported in the status register (SSTAT). In addition, if SMOD0 (PCON.6) is ‘1’, framing errors can be made available in SCON.7 respectively. If SMOD0 is ‘0’, SCON.7 is SM0. It is recommended that SM0 and SM1 (SCON.7:6) are set up when SMOD0 is ‘0’. 8.18.7 Break detect Break detect is reported in the status register (SSTAT). A break is detected when 11 consecutive bits are sensed LOW. The break detect can be used to reset the device and force the device into ISP mode. 8.18.8 Double buffering The UART has a transmit double buffer that allows buffering of the next character to be written to SBUF while the first character is being transmitted. Double buffering allows transmission of a string of characters with only one stop bit between any two characters, as long as the next character is written between the start bit and the stop bit of the previous character. Double buffering can be disabled. If disabled (DBMOD, i.e., SSTAT.7 = ‘0’), the UART is compatible with the conventional 80C51 UART. If enabled, the UART allows writing to SnBUF while the previous data is being shifted out. Double buffering is only allowed in Modes 1, 2 and 3. When operated in Mode 0, double buffering must be disabled (DBMOD = ‘0’). 8.18.9 Transmit interrupts with double buffering enabled (Modes 1, 2 and 3) Unlike the conventional UART, in double buffering mode, the Tx interrupt is generated when the double buffer is ready to receive new data. 8.18.10 The 9th bit (bit 8) in double buffering (Modes 1, 2 and 3) If double buffering is disabled TB8 can be written before or after SBUF is written, as long as TB8 is updated some time before that bit is shifted out. TB8 must not be changed until the bit is shifted out, as indicated by the Tx interrupt. If double buffering is enabled, TB8 must be updated before SBUF is written, as TB8 will be double-buffered together with SBUF data. © Koninklijke Philips Electronics N.V. 2003. All rights reserved. 9397 750 12285 Product data Rev. 06 — 21 November 2003 25 of 45 P89LPC920/921/922 Philips Semiconductors 8-bit microcontrollers with two-clock 80C51 core 8.19 I2C-bus serial interface I2C-bus uses two wires (SDA and SCL) to transfer information between devices connected to the bus, and it has the following features: • Bidirectional data transfer between masters and slaves • Multimaster bus (no central master) • Arbitration between simultaneously transmitting masters without corruption of serial data on the bus • Serial clock synchronization allows devices with different bit rates to communicate via one serial bus • Serial clock synchronization can be used as a handshake mechanism to suspend and resume serial transfer • The I2C-bus may be used for test and diagnostic purposes. A typical I2C-bus configuration is shown in Figure 8. The P89LPC920/921/922 device provides a byte-oriented I2C-bus interface that supports data transfers up to 400 kHz. RP RP SDA I2C-BUS SCL P1.3/SDA P1.2/SCL P89LPC920/921/922 OTHER DEVICE WITH I2C-BUS INTERFACE OTHER DEVICE WITH I2C-BUS INTERFACE 002aaa420 Fig 8. I2C-bus configuration. © Koninklijke Philips Electronics N.V. 2003. All rights reserved. 9397 750 12285 Product data Rev. 06 — 21 November 2003 26 of 45 P89LPC920/921/922 Philips Semiconductors 8-bit microcontrollers with two-clock 80C51 core 8 I2ADR ADDRESS REGISTER INTERNAL BUS P1.3 COMPARATOR INPUT FILTER P1.3/SDA SHIFT REGISTER OUTPUT STAGE ACK I2DAT 8 BIT COUNTER / ARBITRATION & SYNC LOGIC INPUT FILTER P1.2/SCL SERIAL CLOCK GENERATOR OUTPUT STAGE CCLK TIMING & CONTROL LOGIC INTERRUPT TIMER 1 OVERFLOW P1.2 I2CON I2SCLH I2SCLL CONTROL REGISTERS & SCL DUTY CYCLE REGISTERS 8 STATUS BUS I2STAT STATUS DECODER STATUS REGISTER 8 002aaa421 Fig 9. I2C-bus serial interface block diagram. © Koninklijke Philips Electronics N.V. 2003. All rights reserved. 9397 750 12285 Product data Rev. 06 — 21 November 2003 27 of 45 P89LPC920/921/922 Philips Semiconductors 8-bit microcontrollers with two-clock 80C51 core 8.20 Analog comparators Two analog comparators are provided on the P89LPC920/921/922. Input and output options allow use of the comparators in a number of different configurations. Comparator operation is such that the output is a logical one (which may be read in a register and/or routed to a pin) when the positive input (one of two selectable pins) is greater than the negative input (selectable from a pin or an internal reference voltage). Otherwise the output is a zero. Each comparator may be configured to cause an interrupt when the output value changes. The overall connections to both comparators are shown in Figure 10. The comparators function to VDD = 2.4 V. When each comparator is first enabled, the comparator output and interrupt flag are not guaranteed to be stable for 10 microseconds. The corresponding comparator interrupt should not be enabled during that time, and the comparator interrupt flag must be cleared before the interrupt is enabled in order to prevent an immediate interrupt service. When a comparator is disabled the comparator’s output, COx, goes HIGH. If the comparator output was LOW and then is disabled, the resulting transition of the comparator output from a LOW to HIGH state will set the comparator flag, CMFx. This will cause an interrupt if the comparator interrupt is enabled. The user should therefore disable the comparator interrupt prior to disabling the comparator. Additionally, the user should clear the comparator flag, CMFx, after disabling the comparator. CP1 Comparator 1 OE1 (P0.4) CIN1A (P0.3) CIN1B CO1 CMP1 (P0.6) (P0.5) CMPREF Change Detect VREF CMF1 CN1 Interrupt Change Detect CP2 Comparator 2 EC CMF2 (P0.2) CIN2A (P0.1) CIN2B CMP2 (P0.0) CO2 OE2 002aaa422 CN2 Fig 10. Comparator input and output connections. 8.20.1 Internal reference voltage An internal reference voltage generator may supply a default reference when a single comparator input pin is used. The value of the internal reference voltage, referred to as VREF, is 1.23 V ±10%. © Koninklijke Philips Electronics N.V. 2003. All rights reserved. 9397 750 12285 Product data Rev. 06 — 21 November 2003 28 of 45 P89LPC920/921/922 Philips Semiconductors 8-bit microcontrollers with two-clock 80C51 core 8.20.2 Comparator interrupt Each comparator has an interrupt flag contained in its configuration register. This flag is set whenever the comparator output changes state. The flag may be polled by software or may be used to generate an interrupt. The two comparators use one common interrupt vector. If both comparators enable interrupts, after entering the interrupt service routine, the user needs to read the flags to determine which comparator caused the interrupt. 8.20.3 Comparators and power reduction modes Either or both comparators may remain enabled when Power-down or Idle mode is activated, but both comparators are disabled automatically in Total Power-down mode. If a comparator interrupt is enabled (except in Total Power-down mode), a change of the comparator output state will generate an interrupt and wake up the processor. If the comparator output to a pin is enabled, the pin should be configured in the push-pull mode in order to obtain fast switching times while in Power-down mode. The reason is that with the oscillator stopped, the temporary strong pull-up that normally occurs during switching on a quasi-bidirectional port pin does not take place. Comparators consume power in Power-down and Idle modes, as well as in the normal operating mode. This fact should be taken into account when system power consumption is an issue. To minimize power consumption, the user can disable the comparators via PCONA.5, or put the device in Total Power-down mode. 8.21 Keypad interrupt (KBI) The Keypad Interrupt function is intended primarily to allow a single interrupt to be generated when Port 0 is equal to or not equal to a certain pattern. This function can be used for bus address recognition or keypad recognition. The user can configure the port via SFRs for different tasks. The Keypad Interrupt Mask Register (KBMASK) is used to define which input pins connected to Port 0 can trigger the interrupt. The Keypad Pattern Register (KBPATN) is used to define a pattern that is compared to the value of Port 0. The Keypad Interrupt Flag (KBIF) in the Keypad Interrupt Control Register (KBCON) is set when the condition is matched while the Keypad Interrupt function is active. An interrupt will be generated if enabled. The PATN_SEL bit in the Keypad Interrupt Control Register (KBCON) is used to define equal or not-equal for the comparison. In order to use the Keypad Interrupt as an original KBI function like in 87LPC76x series, the user needs to set KBPATN = 0FFH and PATN_SEL = 1 (not equal), then any key connected to Port 0 which is enabled by the KBMASK register will cause the hardware to set KBIF and generate an interrupt if it has been enabled. The interrupt may be used to wake up the CPU from Idle or Power-down modes. This feature is particularly useful in handheld, battery-powered systems that need to carefully manage power consumption yet also need to be convenient to use. In order to set the flag and cause an interrupt, the pattern on Port 0 must be held longer than 6 CCLKs. © Koninklijke Philips Electronics N.V. 2003. All rights reserved. 9397 750 12285 Product data Rev. 06 — 21 November 2003 29 of 45 P89LPC920/921/922 Philips Semiconductors 8-bit microcontrollers with two-clock 80C51 core 8.22 Watchdog timer The Watchdog timer causes a system reset when it underflows as a result of a failure to feed the timer prior to the timer reaching its terminal count. It consists of a programmable 12-bit prescaler, and an 8-bit down counter. The down counter is decremented by a tap taken from the prescaler. The clock source for the prescaler is either the PCLK or the nominal 400 kHz Watchdog oscillator. The Watchdog timer can only be reset by a power-on reset. When the watchdog feature is disabled, it can be used as an interval timer and may generate an interrupt. Figure 11 shows the Watchdog timer in watchdog mode. Feeding the watchdog requires a two-byte sequence. If PCLK is selected as the watchdog clock and the CPU is powered-down, the watchdog is disabled. The Watchdog timer has a time-out period that ranges from a few µs to a few seconds. Please refer to the P89LPC920/921/922 User’s Manual for more details. WDL (C1H) MOV WFEED1, #0A5H MOV WFEED2, #05AH Watchdog oscillator PCLK ÷32 8-BIT DOWN COUNTER PRESCALER RESET see note (1) SHADOW REGISTER FOR WDCON CONTROL REGISTER WDCON (A7H) PRE2 PRE1 PRE0 – – WDRUN WDTOF WDCLK 002aaa423 (1) Watchdog reset can also be caused by an invalid feed sequence, or by writing to WDCON not immediately followed by a feed sequence. Fig 11. Watchdog timer in watchdog mode (WDTE = ‘1’). 8.23 Additional features 8.23.1 Software reset The SRST bit in AUXR1 gives software the opportunity to reset the processor completely, as if an external reset or watchdog reset had occurred. Care should be taken when writing to AUXR1 to avoid accidental software resets. 8.23.2 Dual data pointers The dual Data Pointers (DPTR) provides two different Data Pointers to specify the address used with certain instructions. The DPS bit in the AUXR1 register selects one of the two Data Pointers. Bit 2 of AUXR1 is permanently wired as a logic ‘0’ so that the DPS bit may be toggled (thereby switching Data Pointers) simply by incrementing the AUXR1 register, without the possibility of inadvertently altering other bits in the register. © Koninklijke Philips Electronics N.V. 2003. All rights reserved. 9397 750 12285 Product data Rev. 06 — 21 November 2003 30 of 45 P89LPC920/921/922 Philips Semiconductors 8-bit microcontrollers with two-clock 80C51 core 8.24 Flash program memory 8.24.1 General description The P89LPC920/921/922 Flash memory provides in-circuit electrical erasure and programming. The Flash can be read, erased, or written as bytes. The Sector and Page Erase functions can erase any Flash sector (1 kB) or page (64 bytes). The Chip Erase operation will erase the entire program memory. In-System Programming and standard parallel programming are both available. On-chip erase and write timing generation contribute to a user-friendly programming interface. The P89LPC920/921/922 Flash reliably stores memory contents even after 10,000 erase and program cycles. The cell is designed to optimize the erase and programming mechanisms. The P89LPC920/921/922 uses VDD as the supply voltage to perform the Program/Erase algorithms. 8.24.2 Features • Parallel programming with industry-standard commercial programmers. • In-Circuit serial Programming (ICP) with industry-standard commercial programmers. • IAP-Lite allows individual and multiple bytes of code memory to be used for data storage and programmed under control of the end application. • Internal fixed boot ROM, containing low-level In-Application Programming (IAP) routines that can be called from the end application (in addition to IAP-Lite). • Default serial loader providing In-System Programming (ISP) via the serial port, located in upper end of user program memory. • Boot vector allows user-provided Flash loader code to reside anywhere in the Flash memory space, providing flexibility to the user. • • • • • • 8.24.3 Programming and erase over the full operating voltage range. Read/Programming/Erase using ISP/IAP/IAP-Lite. Any flash program or erase operation in 2 ms. Programmable security for the code in the Flash for each sector. >100,000 typical erase/program cycles for each byte. 10 year minimum data retention. ISP and IAP capabilities of the P89LPC920/921/922 Flash organization: The P89LPC920/921/922 program memory consists of two/four/eight 1 kB sectors. Each sector can be further divided into 64-byte pages. In addition to sector erase, page erase, and byte erase, a 64-byte page register is included which allows from 1 to 64 bytes of a given page to be programmed at the same time, substantially reducing overall programming time. An In-Application Programming (IAP) interface is provided to allow the end user’s application to erase and reprogram the user code memory. In addition, erasing and reprogramming of user-programmable bytes including UCFG1, the Boot Status Bit and the Boot Vector are supported. As shipped from the factory, the upper 512 bytes of user code space contains a serial In-System Programming (ISP) routine allowing for the device to be programmed in circuit through the serial port. © Koninklijke Philips Electronics N.V. 2003. All rights reserved. 9397 750 12285 Product data Rev. 06 — 21 November 2003 31 of 45 P89LPC920/921/922 Philips Semiconductors 8-bit microcontrollers with two-clock 80C51 core Flash programming and erasing: There are three methods of erasing or programming of the Flash memory that may be used. First, the Flash may be programmed or erased in the end-user application by calling low-level routines through a common entry point. Second, the on-chip ISP boot loader may be invoked. This ISP boot loader will, in turn, call low-level routines through the same common entry point that can be used by the end-user application. Third, the Flash may be programmed or erased using the parallel method by using a commercially available EPROM programmer which supports this device. This device does not provide for direct verification of code memory contents. Instead this device provides a 32-bit CRC result on either a sector or the entire 4 kB/8 kB of user code space. Boot ROM: When the microcontroller programs its own Flash memory, all of the low-level details are handled by code that is contained in a Boot ROM that is separate from the Flash memory. A user program simply calls the common entry point in the Boot ROM with appropriate parameters to accomplish the desired operation. The Boot ROM include operations such as erase sector, erase page, program page, CRC, program security bit, etc. The Boot ROM occupies the program memory space at the top of the address space from FF00 to FFFF hex, thereby not conflicting with the user program memory space. Power-on reset code execution: The P89LPC920/921/922 contains two special Flash elements: the Boot Vector and the Boot Status Bit. Following reset, the P89LPC920/921/922 examines the contents of the Boot Status Bit. If the Boot Status Bit is set to zero, power-up execution starts at location 0000H, which is the normal start address of the user’s application code. When the Boot Status Bit is set to a one, the contents of the Boot Vector is used as the high byte of the execution address and the low byte is set to 00H. The factory default setting is 1FH for the P89LPC922 and corresponds to the address 1F00H for the default ISP boot loader. The factory default setting is 0FH for the P89LPC921 and corresponds to the address 0F00H for the default ISP boot loader. The factory default setting for the LPC920 is 07H and corresponds to the address 0700H. This boot loader is pre-programmed at the factory into this address space and can be erased by the user. Users who wish to use this loader should take precautions to avoid erasing the 1 kB sector from 1C00H to 1FFFH in the P89LPC922 or the 1 kB sector from 0C00H to 0FFFH in the P89LPC921, or the 1 kB sector from 0400H to 07FFH in the P89LPC920. Instead, the page erase function can be used to erase the eight 64-byte pages which comprise the lower 512 bytes of the sector. A custom boot loader can be written with the Boot Vector set to the custom boot loader, if desired. Hardware activation of the boot loader: The boot loader can also be executed by forcing the device into ISP mode during a power-on sequence (see the P89LPC920/921/922 User’s Manual for specific information). This has the same effect as having a non-zero Boot Status Bit. This allows an application to be built that will normally execute user code but can be manually forced into ISP operation. If the factory default setting for the Boot Vector is changed, it will no longer point to the factory pre-programmed ISP boot loader code. If this happens, the only way it is possible to change the contents of the Boot Vector is through the parallel programming method, provided that the end user application does not contain a customized loader that provides for erasing and reprogramming of the Boot Vector and Boot Status Bit. After programming the Flash, the Boot Status Bit should be programmed to zero in order to allow execution of the user’s application code beginning at address 0000H. © Koninklijke Philips Electronics N.V. 2003. All rights reserved. 9397 750 12285 Product data Rev. 06 — 21 November 2003 32 of 45 P89LPC920/921/922 Philips Semiconductors 8-bit microcontrollers with two-clock 80C51 core In-System Programming (ISP): In-System Programming is performed without removing the microcontroller from the system. The In-System Programming facility consists of a series of internal hardware resources coupled with internal firmware to facilitate remote programming of the P89LPC920/921/922 through the serial port. This firmware is provided by Philips and embedded within each P89LPC920/921/922 device. The Philips In-System Programming facility has made in-system programming in an embedded application possible with a minimum of additional expense in components and circuit board area. The ISP function uses five pins (VDD, VSS, TXD, RXD, and RST). Only a small connector needs to be available to interface your application to an external circuit in order to use this feature. Please see the P89LPC920/921/922 User’s Manual for additional details. In-Application Programming (IAP): Several In-Application Programming (IAP) calls are available for use by an application program to permit selective erasing and programming of Flash sectors, pages, security bits, configuration bytes, and device identification. All calls are made through a common interface, PGM_MTP. The programming functions are selected by setting up the microcontroller’s registers before making a call to PGM_MTP at FF00H. Please see the P89LPC920/921/922 User’s Manual for additional details. In-Circuit Programming (ICP): In-Circuit Programming is a method intended to allow commercial programmers to program and erase these devices without removing the microcontroller from the system. The In-Circuit Programming facility consists of a series of internal hardware resources to facilitate remote programming of the P89LPC920/921/922 through a two-wire serial interface. Philips has made in-circuit programming in an embedded application possible with a minimum of additional expense in components and circuit board area. The ICP function uses five pins (VDD, VSS, P0.5, P0.4, and RST). Only a small connector needs to be available to interface your application to an external programmer in order to use this feature. 8.25 User configuration bytes A number of user-configurable features of the P89LPC920/921/922 must be defined at power-up and therefore cannot be set by the program after start of execution. These features are configured through the use of the Flash byte UCFG1. Please see the P89LPC920/921/922 User’s Manual for additional details. 8.26 User sector security bytes There are two/four/eight User Sector Security Bytes, each corresponding to one sector. Please see the P89LPC920/921/922 User’s Manual for additional details. © Koninklijke Philips Electronics N.V. 2003. All rights reserved. 9397 750 12285 Product data Rev. 06 — 21 November 2003 33 of 45 P89LPC920/921/922 Philips Semiconductors 8-bit microcontrollers with two-clock 80C51 core 9. Limiting values Table 7: Limiting values In accordance with the Absolute Maximum Rating System (IEC 60134). Symbol Parameter Tamb(bias) Min Max Unit operating bias ambient temperature −55 +125 °C Tstg storage temperature range −65 +150 °C Vxtal voltage on XTAL1, XTAL2 pin to VSS - VDD + 0.5 V Vn voltage on any other pin to VSS −0.5 +5.5 V IOH(I/O) HIGH-level output current per I/O pin - 8 mA IOL(I/O) LOW-level output current per I/O pin - 20 mA II/O(tot)(max) maximum total I/O current Ptot(pack) total power dissipation per package [1] [2] [3] Conditions based on package heat transfer, not device power consumption - 80 mA - 1.5 W Stresses above those listed under Table 7 “Limiting values” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any conditions other than those described in Table 8 “DC electrical characteristics” and Table 9 “AC characteristics” of this specification are not implied. This product includes circuitry specifically designed for the protection of its internal devices from the damaging effects of excessive static charge. Nonetheless, it is suggested that conventional precautions be taken to avoid applying greater than the rated maximum. Parameters are valid over operating temperature range unless otherwise specified. All voltages are with respect to VSS unless otherwise noted. © Koninklijke Philips Electronics N.V. 2003. All rights reserved. 9397 750 12285 Product data Rev. 06 — 21 November 2003 34 of 45 P89LPC920/921/922 Philips Semiconductors 8-bit microcontrollers with two-clock 80C51 core 10. Static characteristics Table 8: DC electrical characteristics VDD = 2.4 V to 3.6 V unless otherwise specified. Tamb = −40 °C to +85 °C for industrial, unless otherwise specified. Symbol Parameter power supply current, operating IDD Min Typ[1] Max Unit 3.6 V; 12 MHz [2] - 9 18 mA Conditions IID power supply current, Idle mode 3.6 V; 12 MHz [2] - 3.25 5 mA IPD Power supply current, Power-down mode, voltage comparators powered-down 3.6 V [2] - - <t.b.d.> µA IPD1 Power supply current, Total Power-down mode 3.6 V [2] - 1 5 µA VDDR VDD rise time - - 2 mV/µs VDDF VDD fall time - - 50 mV/µs VPOR Power-on reset detect voltage - - 0.2 V VRAM RAM keep-alive voltage 1.5 - - V Vth(HL) negative-going threshold voltage (except SCL, SDA) 0.22VDD 0.4VDD - V VIL1 LOW-level input voltage (SCL, SDA only) −0.5 - 0.3VDD V Vth(LH) positive-going threshold voltage (except SCL, SDA) - 0.6VDD 0.7VDD V VIH1 HIGH-level input voltage (SCL, SDA only) 0.7VDD - 5.5 V Vhys hysteresis voltage - 0.2VDD - V VOL LOW-level output voltage; all ports, IOL = 20 mA all modes except Hi-Z[3] IOL = 3.2 mA - 0.6 1.0 V - 0.2 0.3 V VOH HIGH-level output voltage, all ports IOH = −20 mA; push-pull mode <t.b.d.> - - V IOH = −3.2 mA; push-pull mode VDD − 0.7 VDD − 0.4 - V IOH = −20 µA; quasi-bidirectional mode VDD − 0.3 VDD − 0.2 - V Cio IIL Port 1 input/output pin capacitance [4] - - 15 pF logical 0 input current, all ports VIN = 0.4 V [5] - - −80 µA - - ±10 µA −30 - −450 µA 10 - 30 kΩ 2.40 - 2.70 V ILI input leakage current, all ports VIN = VIL or VIH [6] ITL logical 1-to-0 transition current, all ports VIN = 2.0 V at VDD = 3.6 V [7], [8] RRST internal reset pull-up resistor VBO brownout trip voltage with BOV = ‘0’, BOPD = ‘1’ VREF bandgap reference voltage 1.11 1.23 1.34 V TC(VREF) bandgap temperature coefficient - 10 20 ppm/°C [1] 2.4 V < VDD < 3.6 V Typical ratings are not guaranteed. The values listed are at room temperature, 3 V. © Koninklijke Philips Electronics N.V. 2003. All rights reserved. 9397 750 12285 Product data Rev. 06 — 21 November 2003 35 of 45 P89LPC920/921/922 Philips Semiconductors 8-bit microcontrollers with two-clock 80C51 core [2] [3] [4] [5] [6] [7] [8] The IDD, IID, and IPD specifications are measured using an external clock with the following functions disabled: comparators, brownout detect, and Watchdog timer. See Table 7 “Limiting values” on page 34 for steady state (non-transient) limits on IOL or IOH. If IOL/IOH exceeds the test condition, VOL/VOH may exceed the related specification. Pin capacitance is characterized but not tested. Measured with port in quasi-bidirectional mode. Measured with port in high-impedance mode. Ports in quasi-bidirectional mode with weak pull-up (applies to all port pins with pull-ups). Does not apply to open-drain pins. Port pins source a transition current when used in quasi-bidirectional mode and externally driven from ‘1’ to ‘0’. This current is highest when VIN is approximately 2 V. 11. Dynamic characteristics Table 9: AC characteristics Tamb = −40 °C to +85 °C for industrial, unless otherwise specified.[1] Symbol Parameter Conditions trimmed to ±1% at Tamb = 25 °C Variable clock fOSC = 12 MHz Unit Min Max Min Max 7.189 7.557 7.189 7.557 MHz fRCOSC internal RC oscillator frequency (nominal f = 7.3728 MHz) fWDOSC internal Watchdog oscillator frequency (nominal f = 400 kHz) 280 480 280 480 kHz fOCS oscillator frequency 0 12 - - MHz tCLCL clock cycle 83 - - - ns fCLKP CLKLP active frequency 0 8 - - MHz - 50 - 50 ns see Figure 13 Glitch filter glitch rejection, P1.5/RST pin signal acceptance, P1.5/RST pin 125 - 125 - ns glitch rejection, any pin except P1.5/RST - 15 - 15 ns signal acceptance, any pin except P1.5/RST 50 - 50 - ns External clock tCHCX HIGH time see Figure 13 33 tCLCL − tCLCX 33 - ns tCLCX LOW time see Figure 13 33 tCLCL − tCHCX 33 - ns tCLCH rise time see Figure 13 - 8 - 8 ns tCHCL fall time see Figure 13 - 8 - 8 ns Shift register (UART mode 0) tXLXL serial port clock cycle time 16 tCLCL - 1333 - ns tQVXH output data set-up to clock rising edge 13 tCLCL - 1083 - ns tXHQX output data hold after clock rising edge - tCLCL + 20 - 103 ns tXHDX input data hold after clock rising edge - 0 - 0 ns tDVXH input data valid to clock rising edge 150 - 150 - ns [1] [2] Parameters are valid over operating temperature range unless otherwise specified. Parts are tested to 2 MHz, but are guaranteed to operate down to 0 Hz. © Koninklijke Philips Electronics N.V. 2003. All rights reserved. 9397 750 12285 Product data Rev. 06 — 21 November 2003 36 of 45 P89LPC920/921/922 Philips Semiconductors 8-bit microcontrollers with two-clock 80C51 core tXLXL Clock tXHQX tQVXH Output Data 0 Write to SBUF Input Data 1 2 3 4 5 6 7 Valid Valid Valid Valid Valid Valid tXHDX tXHDV Set TI Valid Valid Clear RI Set RI 002aaa425 Fig 12. Shift register mode timing. VDD - 0.5 V 0.2 VDD + 0.9 0.2 VDD - 0.1 V 0.45 V tCHCX tCHCL tCLCX tCLCH tC 002aaa416 Fig 13. External clock timing. Table 10: AC characteristics, ISP entry mode VDD = 2.4 V to 3.6 V, unless otherwise specified. Tamb = −40 °C to +85 °C for industrial, unless otherwise specified. Symbol Parameter Conditions Min Typ Max Unit tVR RST delay from VDD active 50 - - µs tRH RST HIGH time 1 - 32 µs tRL RST LOW time 1 - - µs VDD tVR tRH RST 002aaa426 tRL Fig 14. ISP entry waveform. © Koninklijke Philips Electronics N.V. 2003. All rights reserved. 9397 750 12285 Product data Rev. 06 — 21 November 2003 37 of 45 P89LPC920/921/922 Philips Semiconductors 8-bit microcontrollers with two-clock 80C51 core 12. Comparator electrical characteristics Table 11: Comparator electrical characteristics VDD = 2.4 V to 3.6 V, unless otherwise specified. Tamb = −40 °C to +85 °C for industrial, unless otherwise specified. Symbol Parameter VIO offset voltage comparator inputs VCR common mode range comparator inputs CMRR common mode rejection ratio [1] Min Typ Max Unit - - ±20 mV 0 - VDD − 0.3 V - - −50 dB response time - 250 500 ns comparator enable to output valid - - 10 µs - - ±10 µA input leakage current, comparator IIL Conditions [1] 0 < VIN < VDD This parameter is characterized, but not tested in production. © Koninklijke Philips Electronics N.V. 2003. All rights reserved. 9397 750 12285 Product data Rev. 06 — 21 November 2003 38 of 45 P89LPC920/921/922 Philips Semiconductors 8-bit microcontrollers with two-clock 80C51 core 13. Package outline TSSOP20: plastic thin shrink small outline package; 20 leads; body width 4.4 mm SOT360-1 E D A X c HE y v M A Z 11 20 Q A2 (A 3) A1 pin 1 index A θ Lp L 1 10 detail X w M bp e 0 2.5 5 mm scale DIMENSIONS (mm are the original dimensions) UNIT A max. A1 A2 A3 bp c D (1) E (2) e HE L Lp Q v w y Z (1) θ mm 1.1 0.15 0.05 0.95 0.80 0.25 0.30 0.19 0.2 0.1 6.6 6.4 4.5 4.3 0.65 6.6 6.2 1 0.75 0.50 0.4 0.3 0.2 0.13 0.1 0.5 0.2 8 0o o Notes 1. Plastic or metal protrusions of 0.15 mm maximum per side are not included. 2. Plastic interlead protrusions of 0.25 mm maximum per side are not included. OUTLINE VERSION REFERENCES IEC SOT360-1 JEDEC JEITA MO-153 EUROPEAN PROJECTION ISSUE DATE 99-12-27 03-02-19 Fig 15. TSSOP20 (SOT360-1). © Koninklijke Philips Electronics N.V. 2003. All rights reserved. 9397 750 12285 Product data Rev. 06 — 21 November 2003 39 of 45 P89LPC920/921/922 Philips Semiconductors 8-bit microcontrollers with two-clock 80C51 core DIP20: plastic dual in-line package; 20 leads (300 mil) SOT146-1 ME seating plane D A2 A A1 L c e Z b1 w M (e 1) b MH 11 20 pin 1 index E 1 10 0 5 10 mm scale DIMENSIONS (inch dimensions are derived from the original mm dimensions) UNIT A max. A1 min. A2 max. b b1 c mm 4.2 0.51 3.2 1.73 1.30 0.53 0.38 0.36 0.23 26.92 26.54 inches 0.17 0.02 0.13 0.068 0.051 0.021 0.015 0.014 0.009 1.060 1.045 D e e1 L ME MH w Z (1) max. 6.40 6.22 2.54 7.62 3.60 3.05 8.25 7.80 10.0 8.3 0.254 2 0.25 0.24 0.1 0.3 0.14 0.12 0.32 0.31 0.39 0.33 0.01 0.078 (1) E (1) Note 1. Plastic or metal protrusions of 0.25 mm (0.01 inch) maximum per side are not included. OUTLINE VERSION SOT146-1 REFERENCES IEC JEDEC JEITA MS-001 SC-603 EUROPEAN PROJECTION ISSUE DATE 99-12-27 03-02-13 Fig 16. DIP20 (SOT146-1). © Koninklijke Philips Electronics N.V. 2003. All rights reserved. 9397 750 12285 Product data Rev. 06 — 21 November 2003 40 of 45 P89LPC920/921/922 Philips Semiconductors 8-bit microcontrollers with two-clock 80C51 core 14. Soldering 14.1 Introduction to soldering surface mount packages This text gives a very brief insight to a complex technology. A more in-depth account of soldering ICs can be found in our Data Handbook IC26; Integrated Circuit Packages (document order number 9398 652 90011). There is no soldering method that is ideal for all IC packages. Wave soldering can still be used for certain surface mount ICs, but it is not suitable for fine pitch SMDs. In these situations reflow soldering is recommended. In these situations reflow soldering is recommended. 14.2 Reflow soldering Reflow soldering requires solder paste (a suspension of fine solder particles, flux and binding agent) to be applied to the printed-circuit board by screen printing, stencilling or pressure-syringe dispensing before package placement. Driven by legislation and environmental forces the worldwide use of lead-free solder pastes is increasing. Several methods exist for reflowing; for example, convection or convection/infrared heating in a conveyor type oven. Throughput times (preheating, soldering and cooling) vary between 100 and 200 seconds depending on heating method. Typical reflow peak temperatures range from 215 to 270 °C depending on solder paste material. The top-surface temperature of the packages should preferably be kept: • below 225 °C (SnPb process) or below 245 °C (Pb-free process) – for all BGA, HTSSON..T and SSOP..T packages – for packages with a thickness ≥ 2.5 mm – for packages with a thickness < 2.5 mm and a volume ≥ 350 mm3 so called thick/large packages. • below 240 °C (SnPb process) or below 260 °C (Pb-free process) for packages with a thickness < 2.5 mm and a volume < 350 mm3 so called small/thin packages. Moisture sensitivity precautions, as indicated on packing, must be respected at all times. 14.3 Wave soldering Conventional single wave soldering is not recommended for surface mount devices (SMDs) or printed-circuit boards with a high component density, as solder bridging and non-wetting can present major problems. To overcome these problems the double-wave soldering method was specifically developed. If wave soldering is used the following conditions must be observed for optimal results: • Use a double-wave soldering method comprising a turbulent wave with high upward pressure followed by a smooth laminar wave. © Koninklijke Philips Electronics N.V. 2003. All rights reserved. 9397 750 12285 Product data Rev. 06 — 21 November 2003 41 of 45 P89LPC920/921/922 Philips Semiconductors 8-bit microcontrollers with two-clock 80C51 core • For packages with leads on two sides and a pitch (e): – larger than or equal to 1.27 mm, the footprint longitudinal axis is preferred to be parallel to the transport direction of the printed-circuit board; – smaller than 1.27 mm, the footprint longitudinal axis must be parallel to the transport direction of the printed-circuit board. The footprint must incorporate solder thieves at the downstream end. • For packages with leads on four sides, the footprint must be placed at a 45° angle to the transport direction of the printed-circuit board. The footprint must incorporate solder thieves downstream and at the side corners. During placement and before soldering, the package must be fixed with a droplet of adhesive. The adhesive can be applied by screen printing, pin transfer or syringe dispensing. The package can be soldered after the adhesive is cured. Typical dwell time of the leads in the wave ranges from 3 to 4 seconds at 250 °C or 265 °C, depending on solder material applied, SnPb or Pb-free respectively. A mildly-activated flux will eliminate the need for removal of corrosive residues in most applications. 14.4 Manual soldering Fix the component by first soldering two diagonally-opposite end leads. Use a low voltage (24 V or less) soldering iron applied to the flat part of the lead. Contact time must be limited to 10 seconds at up to 300 °C. When using a dedicated tool, all other leads can be soldered in one operation within 2 to 5 seconds between 270 and 320 °C. 14.5 Package related soldering information Table 12: Suitability of surface mount IC packages for wave and reflow soldering methods Package[1] Soldering method BGA, HTSSON..T[3], LBGA, LFBGA, SQFP, SSOP..T[3], TFBGA, USON, VFBGA Reflow[2] not suitable suitable DHVQFN, HBCC, HBGA, HLQFP, HSO, HSOP, not suitable[4] HSQFP, HSSON, HTQFP, HTSSOP, HVQFN, HVSON, SMS suitable PLCC[5], SO, SOJ suitable suitable recommended[5][6] suitable LQFP, QFP, TQFP not SSOP, TSSOP, VSO, VSSOP not recommended[7] suitable CWQCCN..L[8], not suitable not suitable [1] [2] PMFP[9], WQCCN..L[8] For more detailed information on the BGA packages refer to the (LF)BGA Application Note (AN01026); order a copy from your Philips Semiconductors sales office. All surface mount (SMD) packages are moisture sensitive. Depending upon the moisture content, the maximum temperature (with respect to time) and body size of the package, there is a risk that internal or external package cracks may occur due to vaporization of the moisture in them (the so called popcorn effect). For details, refer to the Drypack information in the Data Handbook IC26; Integrated Circuit Packages; Section: Packing Methods. © Koninklijke Philips Electronics N.V. 2003. All rights reserved. 9397 750 12285 Product data Wave Rev. 06 — 21 November 2003 42 of 45 P89LPC920/921/922 Philips Semiconductors 8-bit microcontrollers with two-clock 80C51 core [3] These transparent plastic packages are extremely sensitive to reflow soldering conditions and must on no account be processed through more than one soldering cycle or subjected to infrared reflow soldering with peak temperature exceeding 217 °C ± 10 °C measured in the atmosphere of the reflow oven. The package body peak temperature must be kept as low as possible. These packages are not suitable for wave soldering. On versions with the heatsink on the bottom side, the solder cannot penetrate between the printed-circuit board and the heatsink. On versions with the heatsink on the top side, the solder might be deposited on the heatsink surface. If wave soldering is considered, then the package must be placed at a 45° angle to the solder wave direction. The package footprint must incorporate solder thieves downstream and at the side corners. Wave soldering is suitable for LQFP, QFP and TQFP packages with a pitch (e) larger than 0.8 mm; it is definitely not suitable for packages with a pitch (e) equal to or smaller than 0.65 mm. Wave soldering is suitable for SSOP and TSSOP packages with a pitch (e) equal to or larger than 0.65 mm; it is definitely not suitable for packages with a pitch (e) equal to or smaller than 0.5 mm. Image sensor packages in principle should not be soldered. They are mounted in sockets or delivered pre-mounted on flex foil. However, the image sensor package can be mounted by the client on a flex foil by using a hot bar soldering process. The appropriate soldering profile can be provided on request. Hot bar soldering or manual soldering is suitable for PMFP packages. [4] [5] [6] [7] [8] [9] 15. Revision history Table 13: Revision history Rev Date 06 20031121 CPCN Description - Product data (9397 750 12285); ECN 853-2403 01-A14557 of 18 November 2003 Modification: • Table 8 “DC electrical characteristics” on page 35: ITL VIN conditions, changed value from 1.5 V to 2.0 V 05 20031007 - Product data (9397 750 12121); ECN 853-2403 30391 of 30 September 2003 04 20030909 - Product data (9397 750 11945); ECN 853-2403 30305 of 5 September 2003 03 20030811 - Preliminary data (9397 750 11786) 02 20030522 - Objective data (9397 750 11532) 01 20030505 - Preliminary data (9397 750 11387) © Koninklijke Philips Electronics N.V. 2003. All rights reserved. 9397 750 12285 Product data Rev. 06 — 21 November 2003 43 of 45 P89LPC920/921/922 Philips Semiconductors 8-bit microcontrollers with two-clock 80C51 core 16. Data sheet status Level Data sheet status[1] Product status[2][3] Definition I Objective data Development This data sheet contains data from the objective specification for product development. Philips Semiconductors reserves the right to change the specification in any manner without notice. II Preliminary data Qualification This data sheet contains data from the preliminary specification. Supplementary data will be published at a later date. Philips Semiconductors reserves the right to change the specification without notice, in order to improve the design and supply the best possible product. III Product data Production This data sheet contains data from the product specification. Philips Semiconductors reserves the right to make changes at any time in order to improve the design, manufacturing and supply. Relevant changes will be communicated via a Customer Product/Process Change Notification (CPCN). [1] Please consult the most recently issued data sheet before initiating or completing a design. [2] The product status of the device(s) described in this data sheet may have changed since this data sheet was published. The latest information is available on the Internet at URL http://www.semiconductors.philips.com. [3] For data sheets describing multiple type numbers, the highest-level product status determines the data sheet status. 17. Definitions customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such application. Short-form specification — The data in a short-form specification is extracted from a full data sheet with the same type number and title. For detailed information see the relevant data sheet or data handbook. Right to make changes — Philips Semiconductors reserves the right to make changes in the products - including circuits, standard cells, and/or software - described or contained herein in order to improve design and/or performance. When the product is in full production (status ‘Production’), relevant changes will be communicated via a Customer Product/Process Change Notification (CPCN). Philips Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no licence or title under any patent, copyright, or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless otherwise specified. Limiting values definition — Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 60134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability. Application information — Applications that are described herein for any of these products are for illustrative purposes only. Philips Semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or modification. 18. Disclaimers 19. Licenses Purchase of Philips I2C components Life support — These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips Semiconductors Purchase of Philips I2C components conveys a license under the Philips’ I2C patent to use the components in the I2C system provided the system conforms to the I2C specification defined by Philips. This specification can be ordered using the code 9398 393 40011. Contact information For additional information, please visit http://www.semiconductors.philips.com. For sales office addresses, send e-mail to: [email protected]. Product data Fax: +31 40 27 24825 © Koninklijke Philips Electronics N.V. 2003. All rights reserved. 9397 750 12285 Rev. 06 — 21 November 2003 44 of 45 P89LPC920/921/922 Philips Semiconductors 8-bit microcontrollers with two-clock 80C51 core Contents 1 2 2.1 2.2 3 3.1 4 5 5.1 5.2 6 7 8 8.1 8.2 8.2.1 8.2.2 8.2.3 8.2.4 8.2.5 8.2.6 8.3 8.4 8.5 8.6 8.7 8.8 8.9 8.10 8.11 8.11.1 8.12 8.12.1 8.12.2 8.12.3 8.12.4 8.12.5 8.12.6 8.12.7 8.13 8.13.1 8.13.2 8.14 8.14.1 8.14.2 8.14.3 8.15 8.15.1 8.16 8.16.1 8.16.2 8.16.3 8.16.4 General description . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Principal features . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Additional features . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Ordering options . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Pinning information. . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Logic symbol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Special function registers. . . . . . . . . . . . . . . . . . . . . . 9 Functional description . . . . . . . . . . . . . . . . . . . . . . . 14 Enhanced CPU . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Clocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Clock definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 CPU clock (OSCCLK) . . . . . . . . . . . . . . . . . . . . . . . 14 Low speed oscillator option . . . . . . . . . . . . . . . . . . . 14 Medium speed oscillator option . . . . . . . . . . . . . . . . 14 High speed oscillator option . . . . . . . . . . . . . . . . . . . 14 Clock output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 On-chip RC oscillator option . . . . . . . . . . . . . . . . . . 15 Watchdog oscillator option . . . . . . . . . . . . . . . . . . . . 15 External clock input option . . . . . . . . . . . . . . . . . . . . 15 CPU Clock (CCLK) wake-up delay. . . . . . . . . . . . . . 16 CPU Clock (CCLK) modification: DIVM register . . . 16 Low power select . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Memory organization . . . . . . . . . . . . . . . . . . . . . . . . 16 Data RAM arrangement . . . . . . . . . . . . . . . . . . . . . . 17 Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 External interrupt inputs . . . . . . . . . . . . . . . . . . . . . . 17 I/O ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Port configurations . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Quasi-bidirectional output configuration. . . . . . . . . . 19 Open-drain output configuration. . . . . . . . . . . . . . . . 19 Input-only configuration . . . . . . . . . . . . . . . . . . . . . . 19 Push-pull output configuration . . . . . . . . . . . . . . . . . 19 Port 0 analog functions . . . . . . . . . . . . . . . . . . . . . . 19 Additional port features . . . . . . . . . . . . . . . . . . . . . . 20 Power monitoring functions . . . . . . . . . . . . . . . . . . . 20 Brownout detection . . . . . . . . . . . . . . . . . . . . . . . . . 20 Power-on detection . . . . . . . . . . . . . . . . . . . . . . . . . 20 Power reduction modes . . . . . . . . . . . . . . . . . . . . . . 21 Idle mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Power-down mode . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Total Power-down mode . . . . . . . . . . . . . . . . . . . . . . 21 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Reset vector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Timers/counters 0 and 1 . . . . . . . . . . . . . . . . . . . . . 22 Mode 0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Mode 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Mode 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Mode 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 © Koninklijke Philips Electronics N.V. 2003. Printed in the U.S.A. All rights are reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license under patent- or other industrial or intellectual property rights. Date of release: 21 November 2003 Document order number: 9397 750 12285 8.16.5 8.16.6 8.17 8.18 8.18.1 8.18.2 8.18.3 8.18.4 8.18.5 8.18.6 8.18.7 8.18.8 8.18.9 Mode 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Timer overflow toggle output. . . . . . . . . . . . . . . . . . . 23 Real-Time clock/system timer. . . . . . . . . . . . . . . . . . 23 UART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Mode 0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Mode 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Mode 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Mode 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Baud rate generator and selection . . . . . . . . . . . . . . 24 Framing error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Break detect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Double buffering . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Transmit interrupts with double buffering enabled (Modes 1, 2 and 3) . . . . . . . . . . . . . . . . . . . 25 8.18.10 The 9th bit (bit 8) in double buffering (Modes 1, 2 and 3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 8.19 I2C-bus serial interface . . . . . . . . . . . . . . . . . . . . . . . 26 8.20 Analog comparators . . . . . . . . . . . . . . . . . . . . . . . . . 28 8.20.1 Internal reference voltage . . . . . . . . . . . . . . . . . . . . . 28 8.20.2 Comparator interrupt. . . . . . . . . . . . . . . . . . . . . . . . . 29 8.20.3 Comparators and power reduction modes . . . . . . . . 29 8.21 Keypad interrupt (KBI) . . . . . . . . . . . . . . . . . . . . . . . 29 8.22 Watchdog timer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 8.23 Additional features . . . . . . . . . . . . . . . . . . . . . . . . . . 30 8.23.1 Software reset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 8.23.2 Dual data pointers. . . . . . . . . . . . . . . . . . . . . . . . . . . 30 8.24 Flash program memory. . . . . . . . . . . . . . . . . . . . . . . 31 8.24.1 General description. . . . . . . . . . . . . . . . . . . . . . . . . . 31 8.24.2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 8.24.3 ISP and IAP capabilities of the P89LPC920/921/922 31 8.25 User configuration bytes . . . . . . . . . . . . . . . . . . . . . . 33 8.26 User sector security bytes . . . . . . . . . . . . . . . . . . . . 33 9 Limiting values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 10 Static characteristics . . . . . . . . . . . . . . . . . . . . . . . . . 35 11 Dynamic characteristics . . . . . . . . . . . . . . . . . . . . . . 36 12 Comparator electrical characteristics . . . . . . . . . . . 38 13 Package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 14 Soldering. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 14.1 Introduction to soldering surface mount packages . . 41 14.2 Reflow soldering . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 14.3 Wave soldering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 14.4 Manual soldering . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 14.5 Package related soldering information . . . . . . . . . . . 42 15 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 16 Data sheet status . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 17 Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 18 Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 19 Licenses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44