SC9351 AUDIO SYSTEM CONTROL MCU DESCRIPTION SC9351 is an 8051-based MCU with built-in 64KByte FLASH, 8KByte 2 RAM and abundant on-chip periphery modules including I C, UART, SPI, ADC and RTC, etc. FEATURES * In system programming(ISP) LQFP-64-10x10-0.5 * 2.7-3.6V supply voltage for chip core, together with internal or external LDO. * 8051 architecture compatible with MCS51 instructions 2~4 clock cycles for per instruction Dual data pointer to improve the data processing efficiency * Built-in 64Kx8 FLASH programmed by on-chip program or APPLICATIONS programmer for program memory or data memory * Data memory IDATA : 256Byte(compatible with 8051) + * Desktop audio, car audio 64Byte(save data when power down) XDATA: 8Kbyte external data memory, low 4K of which can be program memory for Flash programming * Integrate RTC providing calendar, clock, auto leap-year adjustment, timing alarm clock and clock adjustment. Built-in 8-bit timer for max. 256 seconds long time timing. * Maximum 40 general IO pins * Four 8-bit timers T0/T1/T2/T3, where T0/T1 is the same as that of 8051; T2 supports PWM function * Extended interrupt module with four external interrupts * Two UART interfaces. * One SPI interface. * 3-channel 8-bit AD converter. 2 * One I C interface * Various operating modes with low power dissipation ORDERING INFORMATION Part No. Package Marking SC9351 LQFP-64-10 x 10-0.5 SC9351 Resource list Part No. SC9351 Timer 4 ADC channel 3 SPI UART I2C IO Qty.Note1 1 2 1 40 External interrupt 4 Note 1: three pins of P7 port are shared with debug ports. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: //www.silan.com.cn REV:1.0 2009.02.16 Page 1 of 19 SC9351 VSSA VDDA AN0-AN2 P9.1 P9.2 P9.3 P9.4 P9.5 nTST P7.7 P7.6 P7.5 nDBG VDD2o5 VDD VSS XTOUT LDO_EN P9.6 P9.7 P10.0 XTIN XOUT XIN LOWDET P10.1 BLOCK DIAGRAM ABSOLUTE MAXIMUM RATING Characteristics Symbol Ratings Unit Power supply VDD -0.3~+5.0 V Input voltage VIN -0.3~VDD+0.3 V TSTG -65~+150 °C TOPR -40~+85 °C Vesd 2 KV Storage temperature Operating temperature ESD HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: //www.silan.com.cn REV:1.0 2009.02.16 Page 2 of 19 SC9351 ELECTRICAL CHARACTERISTICS (Unless otherwise specified, VCC=3.3V, Tamb=25°C) Characteristics Symbol Test conditions Min. Typ. Max. Unit 3.6 V Power Supply VDD - 2.7 3.3 I/O Pull-Up Resistor Rpu - -- 50 KΩ Operating Frequency FCPU - 12 MHz RTC Input Frequency FRTC - -- 75K Hz -- 7.5 -- mA -- 8 -- mA -- 70 -- μA -- 400 -- μA -- 1.5 -- mA -- 40 -- μA -- 360 -- μA High-Frequency Operating Current1 High-Frequency Operating Current2 FCPU = 12MHz (Other modules are IOPH1 closed except for MCU and SRAM is used as program memory.) FCPU = 12MHz (Other modules are IOPH2 closed except for MCU and FLASH is used as program memory.) FCPU = 75KHz (Other modules are closed except for MCU and RTC is Low-Frequency Operating Current1 IOPL1 powered by external LDO, and SRAM is used as program memory (LDO power dissipation is not included)) FCPU = 75KHz (Other modules are Low-Frequency Operating Current2 IOPL2 closed except for MCU and RTC is powered by internal LDO, and SRAM is used as program memory) FCPU = 75KHz (Other modules are Low-Frequency Operating Current3 IOPL3 closed except for MCU and RTC is powered by internal LDO, and FLASH is used as program memory) FCPU = 75KHz (MCU is in sleep mode, other modules are closed Sleep Current 1 Is1 except for RTC powered by external LDO, and SRAM is used as program memory (LDO power dissipation is not included) ) FCPU = 75KHz (MCU is in sleep mode, other modules are closed Sleep Current 2 Is2 except for RTC powered by internal LDO, and SRAM is used as program memory) HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: //www.silan.com.cn REV:1.0 2009.02.16 Page 3 of 19 SC9351 Characteristics Symbol Test conditions Min. Typ. Max. Unit -- 3.5 -- mA - 14 -- μA FCPU = 12MHz (MCU is in sleep mode, other modules are closed Sleep Current 3 Is3 except for RTC powered by internal LDO, and SRAM or FLASH can both be program memory) Close main oscillator, LDO and other Quiescent Current IQ modules except for RTC working at 75K clock frequency. High-Level Output IOH VOH = 3V - -3.0 - mA IOL VOL = 0.3V - 4.0 - mA IOL VOL = 0.3V - 9.0 - mA Input High Voltage VIH P0/P1/P2/P9 2.0 - - V Input High Voltage VIH P5/P6/P7 1.5 - V Input High Voltage VIH P10 1.5 - V Input Low Voltage VIL P0/P1/P2/P9 - 0.7 V Input Low Voltage VIL P5/P6/P7 - 0.8 V Input Low Voltage VIL P10 - 0.8 V Current (Except For Port P10) Low-Level Output Current(Except For Port P10) Low-Level Output Current (Port P10) HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: //www.silan.com.cn REV:1.0 2009.02.16 Page 4 of 19 SC9351 PIN CONFIGURATION PIN DESCRIPTION Pin No. Pin Name I/O Pin Function 1 P2.2 I/O 2 VSSA -- Ground of ADC 3 VDDA -- Power supply of ADC 4~6 AN0~AN2 7 VSS -- Digital ground 8 VDD -- Power supply of IO, RTC and 64Byte RAM 9 XTIN I 75KHz oscillator input pin 10 XTOUT O 75KHz oscillator output pin 11 nTST I 12 nRST I 13 P2.4/INT0 I/O In extended bus mode, output notDMRD; alternate function is external interrupt InT2 Input channel 0~2 of ADC Test enable pin internally connected with pull-up resistor; High level is connected for normal use. Reset pin internally connected with pull-up resistor; low level reset. General I/O pin; alternate function is external interrupt input INT0 HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: //www.silan.com.cn REV:1.0 2009.02.16 Page 5 of 19 SC9351 Pin No. Pin Name I/O Pin Function 14 P2.5/INT1 I/O General I/O pin; alternate function is external interrupt input INT1 15 VDD2o5O -- 2.5V output pin of LDO with a 1~10uF capacitor to power the core 16 VDDLDO -- Power supply of LDO, input voltage is 2.7~3.3V 17 VSSLDO -- Ground of LDO 18~25 P5.0~5.7 I/O General I/O port P5 with 8 pins 26~28 P6.0~6.2 I/O General I/O port P6 with 3 pins 29 VDD -- 3.3V power supply 30 XIN I 12MHz oscillator input pin. 31 XOUT O 12MHz oscillator output pin. 32 VSS -- Ground 33 P7.5/DE_SI I/O General I/O pin; used as data serial-in in debug mode. 34 P7.6/DE_SO I/O General I/O pin; used as data serial-out in debug mode. 35 P7.7/DE_CLK I/O 36 VDD2o5 -- 2.5V power input 37 VSS -- Ground 38 P10.0/SDA I/O 2 General I/O pin; alternate function is data port of I C 39 P10.1/SCK I/O 2 General I/O pin; alternate function is clock of I C 40 nDBG I 41 P9.1/TXD0 I/O General I/O pin; alternate function is TXD of UART0 42 P9.2/RXD0 I/O General I/O pin; alternate function is RXD of UART0 43 P9.3/TXD1 I/O General I/O pin; alternate function is TXD of UART1 44 P9.4/RXD1 I/O General I/O pin; alternate function is RXD of UART1 45 P9.5/SDI I/O General I/O pin; alternate function is data-in of SPI 46 P9.6/SDO I/O General I/O pin; alternate function is data-out of SPI 47 P9.7/SCLK I/O General I/O pin; alternate function is clock of SPI 48 VDD -- 3.3V power supply 49 VSS -- Ground 50 VDD2o5 -- 2.5V power input 51~58 P0.0~0.7 I/O General I/O port P0 with 8 pins 59 P1.0/PWM I/O General I/O pin; alternate function is PWM waveform output 60 P1.1 I/O General I/O pin 61 P1.2 I/O General I/O pin 62 P1.6/INT6 I/O General I/O pin; alternate function is external interrupt input INT6 63 P1.7/INT7 I/O General I/O pin; multiplexing with external interrupt input INT7 64 P2.0/BUZ I/O General I/O pin; multiplexing with BUZ output General I/O pin; input synchronous communication clock in debug mode Debug mode selection with pull-up resistor; enter Debug mode when it is connected to ground. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: //www.silan.com.cn REV:1.0 2009.02.16 Page 6 of 19 SC9351 FUNCTION DESCRIPTIONS 1. MCU function description 1.1 Introduction to MCU SC9351 adopts S51 MCU core with embedded 64KByte FLASH, supporting external instruction memory and data memory extension. Standard 805x assembler and compiler can be used for software development and maximum 4 hardware breaks supported in Debug mode are convenient for program development. 1.2 Introduction to address space Instruction and data addresses are programmed separately and each occupies 64K address space. z Data memory address assignment Compatible with 8051, it also includes address of internal data memory (IDATA) and external data memory (XDATA), which are accessed by MOV instruction and MOVX instruction respectively. Internal data memory The address space of internal data memory is 0000H~00FFH including several memory areas which are different in physical characteristics. The 128 bytes memory from 00H to 7FH is RAM. Different from general 8051, the 80 bytes memory from 30H to 7FH can be extended as special function register whose addressing method is the same as RAM. The 128 bytes memory from 80H to FFH is the overlap area of RAM and special function register, which are distinguished by their different addressing method ( special function register is accessed by Direct addressing commands, while the RAM is accessed by indirect addressing commands). Different from general 8051, the 64 bytes (from C0H to FFH) can be extended as extra RAM that can be accessed by indirect addressing commands. 00H-7FH RAM128x8 RAM128x8 80H-FFH Special function register Overlap area Extended address space Extended address space Special function register 30H-7FH RAM64x8 C0H-FFH Address space of internal data memory External data memory The address space of external data memory is 0000H~FFFFH which can only be accessed by MOVX instruction. SC9351 integrates 8K bytes RAM with address of 0000H~1FFFH as external data memory which can be extended to 64K according to the requirements. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: //www.silan.com.cn REV:1.0 2009.02.16 Page 7 of 19 SC9351 On-chip RAM 0000H-1FFFH （8Kx8） External memory address space can be extended out of chip 2000H-FFFFH Address space of external data memory 1.3 External data memory extension When data memory is written/read by CPU through MOVX instruction, internal 8K RAM is written/read if the address is within 0X0000~0X1FFF, while external data memory is written/read if the address is beyond 0X1FFF. External data memory extension is not supported here. z Instruction memory address assignment Same as general 8051, the address space of instruction memory is 64K. SC9351 integrates 64K bytes FLASH as internal instruction memory. 1.4 Introduction to DPTR DPTR is a 16-bit data pointer, which can be used by MOVX instruction as indirect addressing register to access the external data memory from 0000H to FFFFH. 8051 has only one DPTR, which is not enough when accessing the external data memory frequently. So SC9351 adopts two DPTRs to access the external data memory conveniently. The two DPTRs share the same address (DPH:83H; DPL:82H) and behavior, and different DPTR can be got through DPS control bit. 2. Special function register (SFR) Address Name R/W Description 8051 special register 81H SP R/W Stack pointer 82H DPL R/W Data pointer low 83H DPH R/W Data pointer high 87H PCON R/W Power control register HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: //www.silan.com.cn REV:1.0 2009.02.16 Page 8 of 19 SC9351 Address Name R/W Description 88H TCON R/W Timer/counter control register 89H TMOD R/W Timer/counter mode control register 98H SCON R/W Serial port control register 99H SBUF R/W Serial data buffer 8AH TL0 R/W Timer/counter 0 (low byte) 8BH TL1 R/W Timer/counter 1 (low byte) 8CH TH0 R/W Timer/counter 0 (high byte) 8DH TH1 R/W Timer/counter 1 (high byte) 8EH TIMPS R/W Prescaler control register of TIMER A2H AUXR1 R/W Data pointer select register of DPTR A8H IE R/W Interrupt enable control register B8H IP R/W Interrupt priority control register D0H PSW R/W Program status word E0H ACC R/W Accumulator of CPU F0H B R/W Register B of CPU Operating mode register (register extended) 31H PSM_OSCREF W Access control address of 75K OSC gain setting 32H PDN_OSCREF W Access control address of 75K OSC enable 33H MCLKSEL W Access control address of CPU clock selection 34H PDN_OSCIN W Access control address of 12M OSC enable 35H PDN_LDO W Access control address of LDO enable 36H OSCRSTCTRL R System clock and power status register 37H HSCSEL W Access control address of high-speed OSC selection 38H LBDCTRL R/W LBD control register External interrupt register (register extended) 39H EINTF R/W External interrupt flag 3AH EXTINTENABLE W External interrupt source identification enable register 3BH EINT_EDGE W External interrupt control register 3CH IPLSR3_E R/W Interrupt priority selection register 4 3DH IPLSR2_E R/W Interrupt priority selection register 3 3EH IPLSR1_E R/W Interrupt priority selection register 2 3FH IPLSR0_E R/W Interrupt priority selection register 1 40H IER_E R/W External interrupt (INT0 extension) enable register 41H IPR_E R/W External interrupt source identification register 42H ISR_E R/W Interrupt status register 43H ICR_E R/W Interrupt mask control register IO register (register extended with address within 30~7FH) 46H P10OD R/W Open-drain output control of port P10 47H P10PU R/W Pull-up control register of port P10 49H P10 R/W Port register of P10 4BH P9OD R/W Open-drain output control of port P9 HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: //www.silan.com.cn REV:1.0 2009.02.16 Page 9 of 19 SC9351 Address Name R/W Description 4CH P9PU R/W Pull-up control register of port P9 4DH P9DDR R/W Direction control register of port P9 C0H P9 R/W Port register of P9 4F~50H registers unused, and read/write is not allowed 51H P7OD R/W Open-drain output control of port P7 52H P7PU R/W Pull-up control register of port P7 53H P6OD R/W Open-drain output control of port P6 54H P6PU R/W Pull-up control register of port P6 55H P5OD R/W Open-drain output control of port P5 56H P5PU R/W Pull-up control register of port P5 57H P4OD R/W Open-drain output control of port P4 58H P4PU R/W Pull-up control register of port P4 5AH~5DH registers unused, and read/write is not allowed 5FH P2OD R/W Open-drain output control of port P2 60H P2PU R/W Pull-up control register of port P2 D4H P2DDR R/W Direction control register of port P2 A0H P2 R/W Port register of P2 64H P1OD R/W Open-drain output control of port P1 65H P1PU R/W Pull-up control register of port P1 66H P1DDR R/W Direction control register of port P1 90H P1 R/W Port register of P1 69H P0D R/W Open-drain output control of port P0 6AH P0PU R/W Pull-up control register of port P0 6BH P0DDR R/W Data direction control register of port P0 80H P0 R/W Port register of P0 RTC register(register extended with address within 30~7FH) 6DH SECADJL R/W Second cycle adjust register 6EH SECADJH R/W Second cycle adjust register 6FH SECADJCON R/W Second adjust control register 70H RTC_CS R/W RTC control and status register 71H YEARH R/W High 8-bit register of year 72H SEC R/W Second register 73H MIN R/W Minute register 74H HOUR R/W Hour register 75H DAY R/W Day register 76H WEEK R/W Week register 77H MON R/W Month register 78H YEARL R/W Low 8-bit register of year 79H MIN_ALARM R/W MIN alarm control register 7AH HOUR_ALARM R/W HOUR alarm control register 7BH DAY_ALARM R/W DAY alarm control register HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: //www.silan.com.cn REV:1.0 2009.02.16 Page 10 of 19 SC9351 Address Name R/W Description 7CH WEEK_ALARM R/W WEEK alarm control register 7DH CLKOUT_CTRL R/W CLKOUT control register 7EH TMCON R/W RTC built-in timer control 7FH TMREF R/W Initial value of RTC built-in timer 84H WDT_CTRL R/W WDT control register 85H WDT_CLR0 W WDT clear register 0 86H WDT_CLR1 W WDT clear register 1 91H SLEEP_CTRL R/W Sleep mode control register 92H SYS_STATUS R/W System status register W Access switch control register of data area 30~7F W Access switch control register of data area C0~FFH R/W IOPort multiplex control register WDT register Register extension setting register 93H CS_SFR RAM extension setting register 94H CS_INTDM Port multiplex control register 96H IOMUX Interrupt register 97H ICR_I R/W Interrupt mask control register 9AH ISR_I R Interrupt status register 9BH IPR_I R Internal interrupt source identification register INT1 extension interrupt (generated by internal 9CH IER_I R/W 9DH IPLSR0_I R/W Interrupt priority selection register 4 9EH IPLSR1_I R/W Interrupt priority selection register 3 9FH IPLSR2_I R/W Interrupt priority selection register 2 A1H IPLSR3_I R/W Interrupt priority selection register 1 modules) enable control Flash program register A5H FSHWRADRH R/W High 8-bit address register of FLASH write A6H FSHWRADRL R/W Low 8-bit address register of FLASH write A7H FSHWRDATA R/W FLASH write data register A9H FSHWRCON1 R/W FLASH write control register 1 AAH FSHWRCON2 R/W FLASH write control register 2 ABH FSHERSCON1 R/W FLASH erase control register 1 ACH FSHERSCON2 R/W FLASH erase control register 2 ADH FSHTIMER R/W FLASH write/erase prescaler control register AEH FlashCtrl R/W FLASH switch control register B1H SPICR R/W SPI control register B2H SPISR R SPI status register B3H SPIBUF W/R SPI transmit/receive buffer B4H SPIBR R/W SPI baud rate setting register SPI register HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: //www.silan.com.cn REV:1.0 2009.02.16 Page 11 of 19 SC9351 Address Name R/W Description B5~BCH registers unused, and read/write is not allowed BDH BUZCR W/R BUZZER output control register 2 I C register BEH I2CRXB R Second stage buffer of data receive BFH I2CSR R Status register DFH I2CCR W/R Control register C1H I2CSLA W/R Slave address/host baud rate setting register W/R Receive/transmit buffer C2H 2 I CBUF UART0 register C3H UART_BUF0 W/R UART0 receive/transmit buffer C4H SCON0 W/R UART0 control register C5H BRCON0 W/R UART0 baud rate control register C6H BRTIMER0 W/R UART0 baud rate setting register UART1 register C7H UART_BUF1 W/R UART1 receive/transmit buffer C9H SCON1 W/R UART1 control register CEH BRCON1 W/R UART1 baud rate control register CFH BRTIMER1 W/R UART1 baud rate setting register D1H ADATA R AD conversion data register D2H ADCON W AD control register D3H ADCIS W AD channel input select register ADC register T2/T3 register D5H T2CON R/W T2 control register D6H T2REF R/W T2 preset register D7~D9FH registers unused, and read/write is not allowed DAH T3CON R/W TIMER3 control register DBH T3REF R/W TIMER3 preset register EE~FFH registers unused, and read/write is not allowed 3. Introduction to operating mode SC9351 provides various operating modes: high-frequency, low-frequency, Sleep and power-down hold. Please see details below: 3.1 High-frequency operating mode In this mode, 12MHz or 12MHz divided-by-2 is selected by software to provide high-speed clock for CPU (use 2 MClk for short in the following), I C, SPI, UART, ADC, TIMER and WDT, etc. While, 75KHz oscillator provides clock for RTC. Operating mode can be switched from high-frequency to low-frequency, Sleep or power-down hold through program setting. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: //www.silan.com.cn REV:1.0 2009.02.16 Page 12 of 19 SC9351 3.2 Low-frequency operating mode In this mode, 75KHz is selected to provide clock for CPU, RTC and all the other function modules and operating mode can be switched from low-frequency to high-frequency or other modes through program setting. Note: 1. 12MHz oscillator needs to be closed by software after MCU being switched to low-frequency operating mode. 2. High-frequency oscillator needs to be open first by software for at least 1ms until it is stable when operating mode is switched from low-frequency to high-frequency. 3.3 Sleep mode In this mode, the clock for CPU, WDT, I2C, SPI, UART and ADC is closed, while oscillator still works and TIMER, RTC, IO port and interrupt system still work under clock. CPU can be waken up by allowed interrupt events caused by external interrupt, RTC, or TIMER and back to former operating mode to execute the corresponding interrupt service routine. 3.4 Power-down hold mode This mode is provided only when the chip adopts internal LDO(this operating mode is not available when 2 adopting external LDO). After LDO is closed, CPU, 64Kx8FLASH, 8Kx8RAM, 256x8RAM, I C, SPI, UART, ADC, TIMER and WDT are powered down because of no 2.5V supply voltage, while 12MHz/75KHz oscillator, RTC, 64x8RAM, IO port and external interrupt extension modules fed by external power supply still work. In this mode, 75KHz oscillator provides clock for RTC; 75KHz or 12MHz oscillator provides clock for IO, interrupt extension module intc_e. RTC and external interrupt can wake up LDO and reset CPU to back to former operating mode. Data can be saved in 64x8RAM in this mode. 4. Introduction to function module 4.1 Clock system There are two oscillators and 75KHz oscillator provides clock for low-frequency operating, 12MHz oscillator provides clock (12MHz/6MHz) for high-frequency operating. 75KHz and 12MHz oscillators are programmable control. In power-down hold mode, 12MHz oscillator can be closed and 75KHz oscillator provides clock for RTC and external extension module. Note: unless otherwise specified, the clock source mentioned below is 12MHz or 75KHz. 4.2 Reset control There are power-on reset/external keypress reset, low voltage detect reset functions. What’s more, RTC interrupt and external interrupt will also generate reset signal in power-down hold mode to reset CPU to come back to operating mode. In power-down hold mode, external interrupt and RTC interrupt will generate reset signal to wake up LDO and reset CPU, which has no effect on register value of RTC, oscillator control, clock control and interrupt extension control, etc. About 15ms time delay is needed for LDO stable. In other operating modes (high-frequency, low-frequency, Sleep), LDO is working normally and HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: //www.silan.com.cn REV:1.0 2009.02.16 Page 13 of 19 SC9351 external interrupt, RTC interrupt will generate interrupt request instead of reset signal. Power-on reset by connecting resistor, capacitor or external keypress reset by connecting reset key to pin nRST are both available. LDO low-voltage detect signal can reset MCU and has no effect on RTC. WDT overflow reset can reset CPU and has no effect on LDO, RTC, clock system, operating mode control module and interrupt extension module, etc. 4.3 Interrupt There are 18 interrupt sources in SC9351 except for reset signals. These interrupt sources enter interrupt processing module through five channels same as 8051. Five interrupts of S51 are supported: INT0, INT1, TF0, TF1, TI/RI, where, INT0 is extended to 4 external interrupts, INT1 (internal interrupt extended) is shared by various internal modules (such as I2C and SPI), and TI/RI interrupt channel is corresponding to transmitting/receiving interrupt of two UARTs. High-level trigged interrupts TF0 and TF1 separately belong to timer/counter0 and timer/counter1 of 8051. Priority and mask function setting for external/internal interrupts extended is independent and software inquiry should be used by interrupt routine due to external/internal interrupts extended share one interrupt entry. (For example, interrupt source register should be checked to make sure which pin triggers the interrupt after INT0 responds to interrupt.) External 4 interrupts are from pin P1.6/P1.7/P2.4/P2.5, which can be programmable as rising-edge or fallingedge trigger, and share the entry address 0003H corresponding to INT0 of 8051. Each interrupt source can be set to a corresponding priority (0~7), which is different according to different sources. And CPU only responses to the interrupt request with PRI (bigger number for higher PRI) higher than the setting value of interrupt control register (ICR). The execution of interrupt service routine with low PRI will not be broken by the interrupt with high PRI which will be responded after the low PRI interrupt is completed due to these interrupts share the same degree of CPU. The interrupts can be responded as long as the interrupt flag is active, so external interrupts will not be lost. 2 Internal interrupts of SC9351 are mainly from its embedded digital and analog modules including I C, SPI, ADC, T2, T3 and RTC, etc., and share the entry address 0013H corresponding to INT1 of 8051. When serial interrupt is processed, RI and TI requests of UART0 share TI of 8051, while RI and TI requests of UART1 share RI of 8051 due to there are two UARTs in SC9351. The interrupt source is decided by inquiring corresponding flag and the flag RI/TI is cleared automatically by hardware after interrupt response. The interrupt processing of S51 is the same as that of 8051, mainly controlled by interrupt enable control register IE and interrupt PRI register IP. The following 3 steps must be executed to use interrupts of S51: 1. Set EA of IE register to 1 2. Set corresponding interrupt enable bit to 1 3. After interrupt is triggered, program pointer jumps to corresponding vector address and interrupt service routine starts to be executed. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: //www.silan.com.cn REV:1.0 2009.02.16 Page 14 of 19 SC9351 Table 1: SC9351 interrupt list Interrupt module Interrupt source EINT0 P2.4 External interrupt EINT1 P2.5 (4) EINT6 P1.6 EINT7 P1.7 Timer 0 Internal interrupt Timer1 Serial port interrupt T0 overflow interrupt PINT0 Reserved PINT1 I2C interrupt PINT2 SPI interrupt PINT3 ADC interrupt PINT4 Reserved PINT5 T2 overflow interrupt PINT6 T3 overflow interrupt PINT7 RTC interrupt T1 overflow interrupt Entry of 8051 Corresponding vector address INT0 0003H TF0 000BH INT1 0013H TF1 001BH UART0(RI0,TI0) TI UART1(RI1,TI1) RI 0023H 4.4 WDT Watchdog (WDT) is mainly used for program monitor, and generates reset signal after the counting overflows to avoid the error execution state. The clock source of WDT counter is 6MHz. In Sleep mode, the clock of WDT is closed and doesn’t work. WdtClr Default latency time of WDT is 175ms after reset and the maximum timing time set by program is 1398ms. Note: In debug mode (nDBG is connected to GND), WDT doesn’t work when MCU is single-step running, and normal work when MCU is full-speed running. 4.5 Timer T0/T1 The operating mode is the same as 8051 with additional programmable prescaler to control the clock frequency HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: //www.silan.com.cn REV:1.0 2009.02.16 Page 15 of 19 SC9351 of TIMER, which is different from frequency divided-by-12 of 8051. MCLK/2, MCLK/4, MCLK/8, MCLK/16, MCLK/32, MCLK/64, MCLK/128 and MCLK/256 can be selected for timer/counter, and MCLK can be 12MHz, 6MHz and 75KHz according to different MCU operating modes. Note: For SC9351, T0 is connected to 0 and T1 is connected to 1, so there is no counter mode. 4.6 Timer T2/T3 Operating mode of T2: internal timing/counting and PWM mode Operating mode of T3: internal timing mode Six clocks below can be selected according to different operating mode: ¾ MCLK/16 ¾ MCLK/64 ¾ OSC75K ¾ MCLK /256 ¾ MCLK /512, ¾ MCLK /1024 4.7 I2C The I2C interface of SC9351 has configurable host and slave modes with 7-bit device addressing function supporting 400Kbps baud rate; however, multiple hosts and the relevant arbitration processing, etc. are not supported. It has mainly three operating modes: Host transmitting and slave receiving; host receiving and slave transmitting continuous mode; host receiving and slave transmitting random mode; 4.8 UART Two independent UARTs can implement serial communication with the following operating modes: 1. 8-bit asynchronous communication mode, baud rate adjustable; 2. 9-bit asynchronous communication mode, baud rate fixed(MCLK/16, MCLK/32); 3. 9-bit asynchronous communication mode, baud rate adjustable. 4.9 SPI SPI adopts three-line transmission method including SCK (bi-direction clock line), SDI (data output) and SDO (data input), which supports simplex, half duplex, full duplex transmission modes below: 1. Internal (clock)transmitting－－external (clock)receiving 2. Internal receiving－－external transmitting 3. Internal receiving/transmitting－－external receiving/transmitting 4.10 ADC 8-bit AD converter is mainly used for keyboard scan, electronic volume or low-speed data sampling with three input channels (AN0~2) which can be chosen for input conversion voltage and the result is stored in an 8-bit register. There are four clock sources (75KHz, MCLK/8, MCLK/16, MCLK/32) for conversion clock and internal reference voltage or external power supply (VDD) can be reference voltage. 11 clock cycles are needed for one AD conversion, and conversion time is7.3μs when the clock source of ADC is MCLK/8 under 12MHz system clock. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: //www.silan.com.cn REV:1.0 2009.02.16 Page 16 of 19 SC9351 4.11 RTC The real time clock (RTC) driven by frequency divided-by-2 of 75KHz clock provides clock and calendar function of year, month, week, hour, minute and second and the leap year auto switch function. When setting week, day, hour and minute, the alarm clock generates alarm interrupt which can close or start some function of alarm clock through corresponding alarm control bit. In standby state, RTC needs to be powered by battery to remain the working state. RTC provides an 8-bit timer with four clock sources: 4687Hz, 73Hz, 1Hz and 37.5KHz. The operation of this timer is similar to others and long time timing is easy to realize due to the low-frequency of clock source. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: //www.silan.com.cn REV:1.0 2009.02.16 Page 17 of 19 SC9351 TYPICAL APPLICATION CIRCUIT HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: //www.silan.com.cn REV:1.0 2009.02.16 Page 18 of 19 SC9351 PACKAGE OUTLINE LQFP-64-10x10-0.5 Unit: mm MOS DEVICES OPERATE NOTES: Electrostatic charges may exist in many things. Please take following preventive measures to prevent effectively the MOS electric circuit as a result of the damage which is caused by discharge: z The operator must put on wrist strap which should be earthed to against electrostatic. z Equipment cases should be earthed. z All tools used during assembly, including soldering tools and solder baths, must be earthed. z MOS devices should be packed in antistatic/conductive containers for transportation. Disclaimer: • Silan reserves the right to make changes to the information herein for the improvement of the design and performance without further notice! • All semiconductor products malfunction or fail with some probability under special conditions. When using Silan products in system design or complete machine manufacturing, it is the responsibility of the buyer to comply with the safety standards strictly and take essential measures to avoid situations in which a malfunction or failure of such Silan products • could cause loss of body injury or damage to property. Silan will supply the best possible product for customers! HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: //www.silan.com.cn REV:1.0 2009.02.16 Page 19 of 19