PHILIPS 83C453

INTEGRATED CIRCUITS
83C453/87C453
80C51 8-bit microcontroller family
8K/256 OTP/ROM, expanded I/O
Preliminary specification
Supersedes data of 1997 Dec 29
IC20 Data Handbook
1998 Apr 23
Philips Semiconductors
Preliminary specification
80C51 8-bit microcontroller family
8K/256 OTP/ROM, expanded I/O
83C453/87C453
DESCRIPTION
FEATURES
• 80C51 based architecture
• Seven 8-bit I/O ports
• Port 6 features:
The Philips 8XC453 is an I/O expanded single-chip microcontroller
fabricated with Philips high-density CMOS technology. Philips
epitaxial substrate minimizes latch-up sensitivity.
The 8XC453 is a functional extension of the 87C51 microcontroller
with three additional I/O ports and four I/O control lines. The 8XC453
is available in 68-pin LCC packages. Four control lines associated
with port 6 facilitate high-speed asynchronous I/O functions.
– Eight data pins
– Four control pins
– Direct MPU bus interface
The 87C453 includes an 8k × 8 EPROM, a 256 × 8 RAM, 56 I/O
lines, two 16-bit timer/counters, a seven source, two priority level,
nested interrupt structure, a serial I/O port for either a full duplex
UART, I/O expansion, or multi-processor communications, and
on-chip oscillator and clock circuits.
– ISA Bus Interface
– Parallel printer interface
– IBF and OBF interrupts
– A flag latch on host write
• On the microcontroller:
The 87C453 has two software selectable modes of reduced activity
for further power reduction; idle mode and power-down mode. Idle
mode freezes the CPU while allowing the RAM, timers, serial port,
and interrupt system to continue functioning. Power-down mode
freezes the oscillator, causing all other chip functions to be
inoperative while maintaining the RAM contents.
– 8k × 8 EPROM
Quick pulse programming algorithm
Two-level program security system
– 256 × 8 RAM
– Two 16-bit counter/timers
– Two external interrupts
• External memory addressing capability
– 64k ROM and 64k RAM
• Low power consumption:
– Normal operation: less than 24mA at 5V, 16MHz
– Idle mode
– Power-down mode
• Reduced EMI
• Full-duplex enhanced UART
– Framing error detection
– Automatic address recognition
ORDERING INFORMATION
EPROM1
P87C453EBAA
ROM
OTP
P83C453EBAA
TEMPERATURE °C AND PACKAGE
FREQ.
(MHz)
PKG. DWG
#
68–Pin Plastic Leaded Chip Carrier, 0 to +70
3.5 to 16
SOT188-3
NOTE:
1. OTP = One-Time Programmable EPROM.
1998 Apr 23
2
Philips Semiconductors
Preliminary specification
80C51 8-bit microcontroller family
8K/256 OTP/ROM, expanded I/O
83C453/87C453
BLOCK DIAGRAM
P0.0–P0.7
P2.0–P2.7
P4.0–P4.7
P5.0–5.7
PORT 0
DRIVERS
PORT 2
DRIVERS
PORT 4
DRIVERS
PORT 5
DRIVERS
PORT 2
LATCH
PORT 4
LATCH
PORT 5
LATCH
VCC
VSS
256 BYTES
RAM
RAM ADDR
REGISTER
B
REGISTER
PORT 0
LATCH
8K x 8
EPROM
STACK
POINTER
ACC
PROGRAM
ADDRESS
REGISTER
TMP1
TMP2
BUFFER
PCON
ALU
PSW
SCON TMOD
TCON
PSW
TH0
TL0
TH1
TL1
DPH
DPL
AUXR
CSR
SBUF
IE
IP
PC
INCREMENTER
INTERRUPT, SERIAL
PORT AND TIMER BLOCKS
PSEN
ALE/PROG
EAVPP
TIMING
AND
CONTROL
RST
INSTRUCTION
REGISTER
PROGRAM
COUNTER
PD
DPTR
PORT 1
LATCH
PORT 6
LATCH
PORT 1
DRIVERS
PORT 6
DRIVERS
PORT 6
CONTROL/STATUS
PORT 3
DRIVERS
P1.0–P1.7
P6.0–P6.7
IDS ODS
BFLAG
AFLAG
P3.0–P3.7
PORT 3
LATCH
OSCILLATOR
XTAL1
XTAL2
SU00158
1998 Apr 23
3
Philips Semiconductors
Preliminary specification
80C51 8-bit microcontroller family
8K/256 OTP/ROM, expanded I/O
83C453/87C453
LOGIC SYMBOL
LCC PIN FUNCTIONS
VCC
VSS
9
1
61
XTAL1
PORT 0
10
60
ADDRESS AND
DATA BUS
LCC
XTAL2
PORT 6 CONTROL
ODS
IDS
BFLAG
AFLAG
PORT 1
ADDRESS BUS
PORT 4
PORT 2
44
27
PORT 5
RxD
TxD
INT0
INT1
T0
T1
WR
RD
PORT 3
RST
EA/VPP
PSEN
ALE/PROG
PORT 6
SECONDARY FUNCTIONS
26
SU00085
43
Pin
1
2
3
Function
EA/VPP
P2.0/A8
P2.1/A9
Pin
24
25
26
Function
P4.2
P4.1
P4.0
4
5
6
7
P2.2/A10
P2.3/A11
P2.4/A12
P2.5/A13
27
28
29
30
P1.0
P1.1
P1.2
P1.3
50
51
52
53
P5.6
P5.7
XTAL2
XTAL1
8
9
10
11
P2.6/A14
P2.7/A15
P0.7/AD7
P0.6/AD6
31
32
33
34
P1.4
P1.5
P1.6
P1.7
54
55
56
57
VSS
ODS
IDS
BFLAG
12
13
14
15
P0.5/AD5
P0.4/AD4
P0.3/AD3
P0.2/AD2
35
36
37
38
RST
P3.0/RxD
P3.1/TxD
P3.2/INTO
58
59
60
61
AFLAG
P6.0
P6.1
P6.2
16
17
18
19
P0.1/AD1
P0.0/AD0
VCC
P4.7
39
40
41
42
P3.3/INT1
P3.4/T0
P3.5/T1
P3.6/WR
62
63
64
65
P6.3
P6.4
P6.5
P6.6
20
21
22
23
P4.6
P4.5
P4.4
P4.3
43
44
45
46
P3.7/RD
P5.0
P5.1
P5.2
66
67
68
P6.7
PSEN
ALE/PROG
Pin
47
48
49
Function
P5.3
P5.4
P5.5
SU00157
1998 Apr 23
4
Philips Semiconductors
Preliminary specification
80C51 8-bit microcontroller family
8K/256 OTP/ROM, expanded I/O
83C453/87C453
PIN DESCRIPTION
MNEMONIC
PIN NO.
TYPE
NAME AND FUNCTION
VSS
54
I
Ground: 0V reference.
VCC
18
I
Power Supply: This is the power supply voltage for normal, idle, and power-down operation.
P0.0–0.7
17-10
I/O
Port 0: Port 0 is an open-drain, bidirectional I/O port. Port 0 is also the multiplexed data and low-order
address bus during accesses to external memory. External pull-ups are required during program
verification. Port 0 can sink/source eight LS TTL inputs.
P1.0–P1.7
27-34
I/O
Port 1: Port 1 is an 8-bit bidirectional I/O port with internal pull-ups. Port 1 receives the low-order address
bytes during program memory verification. Port 1 can sink/source three LS TTL inputs, and drive CMOS
inputs without external pull-ups.
P2.0–P2.7
2-9
I/O
Port 2: Port 2 is an 8-bit bidirectional I/O port with internal pull-ups. Port 2 emits the high-order address
bytes during access to external memory and receives the high-order address bits and control signals
during program verification. Port 2 can sink/source three LS TTL inputs, and drive CMOS inputs without
external pull-ups.
P3.0–P3.7
36-43
I/O
36
37
38
39
40
41
42
43
I
O
I
I
I
I
O
O
Port 3: Port 3 is an 8-bit bidirectional I/O port with internal pull-ups. Port 3 can sink/source three LS TTL
inputs, and drive CMOS inputs without external pull-ups. Port 3 also serves the special functions listed
below:
RxD (P3.0): Serial input port
TxD (P3.1): Serial output port
INT0 (P3.2): External interrupt
INT1 (P3.3): External interrupt
T0 (P3.4): Timer 0 external input
T1 (P3.5): Timer 1 external input
WR (P3.6): External data memory write strobe
RD (P3.7): External data memory read strobe
P4.0–P4.3
P4.0–P4.7
26-19
I/O
I/O
Port 4: Port 4 is an 8-bit bidirectional I/O port with internal pull-ups. Port 4 can sink/source three LS TTL
inputs and drive CMOS inputs without external pull-ups.
P5.0–P5.7
44-51
I/O
Port 5: Port 5 is an 8-bit bidirectional I/O port with internal pull-ups. Port 5 can sink/source three LS TTL
inputs and drive CMOS inputs without external pull-ups.
P6.0–P6.7
59-66
I/O
Port 6: Port 6 is a specialized 8-bit bidirectional I/O port with internal pull-ups. This special port can
sink/source three LS TTL inputs and drive CMOS inputs without external pull-ups. Port 6 can be used in a
strobed or non-strobed mode of operation. Port 6 works in conjunction with four control pins that serve the
functions listed below:
ODS
55
I
ODS: Output data strobe
IDS
56
I
IDS: Input data strobe
BFLAG
57
I/O
BFLAG: Bidirectional I/O pin with internal pull-ups
AFLAG
58
I/O
AFLAG: Bidirectional I/O pin with internal pull-ups
RST
35
I
ALE/PROG
68
I/O
Address Latch Enable/Program Pulse: Output pulse for latching the low byte of the address during an
access to external memory. ALE is activated at a constant rate of 1/6 the oscillator frequency except during
an external data memory access, at which time one ALE is skipped. ALE can sink/source three LS TTL
inputs and drive CMOS inputs without external pull-ups. This pin is also the program pulse during EPROM
programming.
PSEN
67
O
Program Store Enable: The read strobe to external program memory. PSEN is activated twice each
machine cycle during fetches from external program memory. However, when executing out of external
program memory, two activations of PSEN are skipped during each access to external program memory.
PSEN is not activated during fetches from internal program memory. PSEN can sink/source eight LS TTL
inputs and drive CMOS inputs without an external pull-up. This pin should be tied low during programming.
EA/VPP
1
I
Instruction Execution Control/Programming Supply Voltage: When EA is held high, the CPU executes
out of internal program memory, unless the program counter exceeds 1FFFH. When EA is held low, the
CPU executes out of external program memory. EA must never be allowed to float. This pin also receives
the 12.75V programming supply voltage (VPP) during EPROM programming.
XTAL1
53
I
Crystal 1: Input to the inverting oscillator amplifier that forms the oscillator. This input receives the external
oscillator when an external oscillator is used.
XTAL2
52
O
Crystal 2: An output of the inverting amplifier that forms the oscillator. This pin should be floated when an
external oscillator is used.
1998 Apr 23
Reset: A high on this pin for two machine cycles while the oscillator is running, resets the device. An
internal pull-down resistor permits a power-on reset using only an external capacitor connected to VCC.
5
Philips Semiconductors
Preliminary specification
80C51 8-bit microcontroller family
8K/256 OTP/ROM, expanded I/O
Table 1.
SYMBOL
83C453/87C453
87C453 Special Function Registers
DESCRIPTION
DIRECT
ADDRESS
BIT NAMES AND ADDRESSES
MSB
LSB
RESET
VALUE
ACC*
Accumulator
E0H
E7
E6
E5
E4
E3
E2
E1
E0
00H
B*
B register
F0H
F7
F6
F5
F4
F3
F2
F1
F0
00H
EF
EE
ED
EC
EB
EA
E9
E8
MB1
MB0
MA1
MA0
OBFC
IDSM
OBF
IBF
CSR*#
Port 6 command/status
DPTR
Data pointer (2 bytes)
E8H
DPH
Data pointer high
83H
DPL
Data pointer low
82H
FCH
00H
00H
BF
BE
BD
BC
BB
BA
B9
B8
IP*
Interrupt priority
B8H
–
POB
PIB
PS
PT1
PX1
PT0
PX0
x0000000B
AUXR#
Auxiliary register
8EH
–
–
–
–
–
–
AF
AO
x0000000B
AF
AE
AD
AC
AB
AA
A9
A8
IE*
Interrupt enable
A8H
EA
IOB
IIB
ES
ET1
EX1
ET0
EX0
P0*
Port 0
80H
87
B6
85
84
83
82
81
80
FFH
P1*
Port 1
90H
97
96
95
94
93
92
91
90
FFH
P2*
Port 2
A0H
A7
A6
A5
A4
A3
A2
A1
A0
FFH
P3*
Port 3
B0H
B7
B6
B5
B4
B3
B2
B1
B0
FFH
P4*#
Port 4
C0H
C7
C6
C5
C4
C3
C2
C1
C0
FFH
P5*#
Port 5
C8H
CF
CE
CD
CC
CB
CA
C9
C8
FFH
P6*#
Port 6
D8H
DF
DE
DD
DC
DB
DA
D9
D8
FFH
PCON
Power control
87H
SMOD1
SMOD0
–
POF1
GF1
GF0
PD
IDL
00xx0000B
D7
D6
D5
D4
D3
D2
D1
D0
PSW*
Program status word
D0H
CY
AC
F0
RS1
RS0
OV
–
P
SADDR#
Slave Address
A9H
00H
SADEN#
Slave Address Mask
B9H
00H
SBUF
Serial data buffer
99H
xxxxxxxxB
SCON*
Serial port control
98H
SP
Stack pointer
81H
9F
9E
9D
9C
9B
9A
99
98
SM0
SM1
SM2
REN
TB8
RB8
TI
RI
00000000B
00H
00H
07H
8F
8E
8D
8C
8B
8A
89
88
TCON*
Timer/counter control
88H
TF1
TR1
TF0
TR0
IE1
IT1
IE0
IT0
00H
TMOD
Timer/counter mode
89H
GATE
C/T
M1
M0
GATE
C/T
M1
M0
00H
TH0
Timer 0 high byte
8CH
00H
TH1
Timer 1 high byte
8DH
00H
TL0
Timer 0 low byte
8AH
00H
TL1
Timer 1 low byte
8BH
00H
NOTES:
* SFRs are bit addressable.
# SFRs are modified from or added to the 80C51 SFRs.
1. REset value depends on reset source.
1998 Apr 23
6
Philips Semiconductors
Preliminary specification
80C51 8-bit microcontroller family
8K/256 OTP/ROM, expanded I/O
83C453/87C453
IE REGISTER
HIGH PRIORITY
INTERRUPT
IP REGISTER
0
IE.0
IT0
INT0
1
INTERRUPT
POLLING
SEQUENCE
IE.1
TF0
0
IE.2
IT1
INT1
1
IE.3
TF1
RI
IE.4
TI
IE.5
IBF
IE.6
OBF
INDIVIDUAL
ENABLES
LOW PRIORITY
INTERRUPT
GLOBAL
DISABLE
SU00562
Figure 1. 8XC453 Interrupt Control System
MSB
EA
BIT
IE.7
SYMBOL
EA
IE.6
IOB
IE.5
IIB
IE.4
ES
IE.3
IE.2
IE.1
IE.0
ET1
EX1
ET0
EX0
LSB
IOB
IIB
ES
ET1
EX1
ET0
EX0
FUNCTION
Disables all interrupts. If EA=0, no interrupt will be acknowledged. If EA=1, each interrupt
source is individually enabled or disabled by setting or clearing its enable bit.
Enables or disables the Output Buffer Full (OBF) interrupt. If IOB=0, the interrupt is disabled,
If IOB=1, an interrupt will occur if EA is set and data has been read from the output buffer
register through Port 6 by the external host pulsing ODS low.
Enables or disables the Input Buffer Full (IBF) interrupt. If IIB=0, the interrupt is disabled. If
IIB=1, an interrupt will occur if EA is set and data has been written into the Port 6 Input Data
Buffer by the host strobing IDS low.
Enables or disables the Serial Port Interrupt. If ES=0, the Serial Port Interrupt. If ES=0, the
Serial Port interrupt is disabled.
Enables or disables the Timer 1 Overflow interrupt. If ET1=0, the Timer 1 interrupt is disabled.
Enables or disables External Interrupt 1. If EX1=0, External Interrupt 1 is disabled.
Enables or disables the Timer 0 Overflow interrupt. If ET0=0, the Timer 0 interrupt is disabled.
Enables or disables External Interrupt 0. If EX0=0, external Interrupt 0 is disabled.
SU00563
Figure 2. 8XC453 Interrupt Enable (IE) Register
1998 Apr 23
7
Philips Semiconductors
Preliminary specification
80C51 8-bit microcontroller family
8K/256 OTP/ROM, expanded I/O
83C453/87C453
MSB
—
BIT
IP.7
IP.6
IP.5
IP.4
IP.3
IP.2
IP.1
IP.0
SYMBOL
—
POB
PIB
PS
PT1
PX1
PT0
PX0
LSB
POB
PIB
PS
PT1
PX1
PT0
PX0
FUNCTION
Reserved.
Defines the Output Buffer Full interrupt (IOB) priority level. POB=1 programs it to the higher priority level.
Defines the Input Buffer Full interrupt (IIB) priority level. PIB=1 programs it to the higher priority level.
Defines the Serial Port interrupt priority level. PS=1 programs it to the higher priority level.
Defines the Timer 1 interrupt priority level. PT1=1 programs it to the higher priority level.
Defines the External Interrupt 1 priority level. PX1=1 programs it to the higher priority level.
Enables or disables the Timer 0 interrupt priority level. PT0=1 programs it to the higher priority level.
Defines the External Interrupt 0 priority level. PX0=1 programs it to the higher priority level.
SU00564
Figure 3. 8XC453 Interrupt Priority (IP) Register
7
PCON (87H)
6
SMOD1 SMOD2
BIT
PCON.7
SYMBOL
SMOD1
PCON.6
PCON.5
PCON.4
SMOD0
—
POF
PCON.3
PCON.2
PCON.1
PCON.0
GF1
GF0
PD
IDL
5
4
3
2
1
0
—
POF
GF1
GF0
PD
IDL
FUNCTION
Double Baud rate bit. When set to a 1 and Timer 1 is used to generate baud rate, and the Serial Port
is used in modes 1, 2, or 3.
If set to 1, SCON.7 will be the Framing Error bit (FE). If PCON.6 is cleared, SCON.7 will be SM0.
Reserved.
Power Off Flag is set during power on of VCC. If then cleared by software, it can be used to determine
if a warm start has occurred.
General-purpose flag bit.
General-purpose flag bit.
Power-Down bit. Setting this bit activates power-down mode. It can only be set if input EW is high.
Idle mode bit. Setting this bit activates the idle mode.
If logic 1s are written to PD and IDL at the same time, PD takes precedence.
SU00565
Figure 4. Power Control Register (PCON)
Table 2. Interrupt Table
POLLING
PRIORITY
SOURCE
REQUEST
BITS/FLAG
VECTOR
ADDRESS
1
INTO
IE0
03H highest priority
2
Timer0
TF0
0BH
3
INT1
IE1
13H
4
Timer1
TF1
1BH
5
Port 6
OBF
33H
6
Serial I/O
RI,TI
23H
7
Port 6
IBF
2BH lowest priority
1998 Apr 23
8
Philips Semiconductors
Preliminary specification
80C51 8-bit microcontroller family
8K/256 OTP/ROM, expanded I/O
83C453/87C453
SCON Address = 98H
Reset Value = 0000 0000B
Bit Addressable
SM0/FE
Bit:
SM1
SM2
REN
TB8
RB8
Tl
Rl
5
4
3
2
1
0
7
6
(SMOD0 = 0/1)*
Symbol
Function
FE
Framing Error bit. This bit is set by the receiver when an invalid stop bit is detected. The FE bit is not cleared by valid
frames but should be cleared by software. The SMOD0 bit must be set to enable access to the FE bit.
SM0
Serial Port Mode Bit 0, (SMOD0 must = 0 to access bit SM0)
SM1
Serial Port Mode Bit 1
SM0
SM1
Mode
0
0
1
1
0
1
0
1
0
1
2
3
Description
Baud Rate**
shift register
8-bit UART
9-bit UART
9-bit UART
fOSC/12
variable
fOSC/64 or fOSC/32
variable
SM2
Enables the Automatic Address Recognition feature in Modes 2 or 3. If SM2 = 1 then Rl will not be set unless the
received 9th data bit (RB8) is 1, indicating an address, and the received byte is a Given or Broadcast Address.
In Mode 1, if SM2 = 1 then Rl will not be activated unless a valid stop bit was received, and the received byte is a
Given or Broadcast Address. In Mode 0, SM2 should be 0.
REN
Enables serial reception. Set by software to enable reception. Clear by software to disable reception.
TB8
The 9th data bit that will be transmitted in Modes 2 and 3. Set or clear by software as desired.
RB8
In modes 2 and 3, the 9th data bit that was received. In Mode 1, if SM2 = 0, RB8 is the stop bit that was received.
In Mode 0, RB8 is not used.
Tl
Transmit interrupt flag. Set by hardware at the end of the 8th bit time in Mode 0, or at the beginning of the stop bit in the
other modes, in any serial transmission. Must be cleared by software.
Rl
Receive interrupt flag. Set by hardware at the end of the 8th bit time in Mode 0, or halfway through the stop bit time in
the other modes, in any serial reception (except see SM2). Must be cleared by software.
NOTE:
*SMOD0 is located at PCON6.
**fOSC = oscillator frequency
SU00043
Figure 5. Serial Port Control Register (SCON)
D0
D1
D2
D3
D4
D5
D6
D7
D8
DATA BYTE
START
BIT
ONLY IN
MODE 2, 3
STOP
BIT
SET FE BIT IF STOP BIT IS 0 (FRAMING ERROR)
SM0 TO UART MODE CONTROL
SM0 / FE
SM1
SM2
REN
TB8
RB8
TI
RI
SCON
(98H)
SMOD1
SMOD0
–
POF
LVF
GF0
GF1
IDL
PCON
(87H)
0 : SCON.7 = SM0
1 : SCON.7 = FE
SU00044
Figure 6. UART Framing Error Detection
1998 Apr 23
9
Philips Semiconductors
Preliminary specification
80C51 8-bit microcontroller family
8K/256 OTP/ROM, expanded I/O
D0
D1
D2
83C453/87C453
D3
D4
SM0
SM1
1
1
1
0
D5
SM2
1
D6
D7
D8
REN
TB8
RB8
1
X
TI
RI
SCON
(98H)
RECEIVED ADDRESS D0 TO D7
COMPARATOR
PROGRAMMED ADDRESS
IN UART MODE 2 OR MODE 3 AND SM2 = 1:
INTERRUPT IF REN=1, RB8=1 AND “RECEIVED ADDRESS” = “PROGRAMMED ADDRESS”
– WHEN OWN ADDRESS RECEIVED, CLEAR SM2 TO RECEIVE DATA BYTES
– WHEN ALL DATA BYTES HAVE BEEN RECEIVED: SET SM2 TO WAIT FOR NEXT ADDRESS.
SU00045
Figure 7. UART Multiprocessor Communication, Automatic Address Recognition
Given slave address or addresses. All of the slaves may be
contacted by using the Broadcast address. Two special Function
Registers are used to define the slave’s address, SADDR, and the
address mask, SADEN. SADEN is used to define which bits in the
SADDR are to b used and which bits are “don’t care”. The SADEN
mask can be logically ANDed with the SADDR to create the “Given”
address which the master will use for addressing each of the slaves.
Use of the Given address allows multiple slaves to be recognized
while excluding others. The following examples will help to show the
versatility of this scheme:
SPECIAL FUNCTION REGISTER ADDRESSES
Special function register addresses for the device are identical to
those of the 80C51, except for the additional registers listed in
Table 3.
Enhanced UART
The UART operates in all of the usual modes that are described in
the first section of this book for the 80C51. In addition the UART can
perform framing error detect by looking for missing stop bits, and
automatic address recognition. The 87C453 UART also fully
supports multiprocessor communication as does the standard
80C51 UART.
When used for framing error detect the UART looks for missing stop
bits in the communication. A missing bit will set the FE bit in the
SCON register. The FE bit shares the SCON.7 bit with SM0 and the
function of SCON.7 is determined by PCON.6 (SMOD0) (see
Figure 5). If SMOD0 is set then SCON.7 functions as FE. SCON.7
functions as SM0 when SMOD0 is cleared. When used as FE
SCON.7 can only be cleared by software. Refer to Figure 6.
SADDR =
SADEN =
Given
=
1100 0000
1111 1101
1100 00X0
Slave 1
SADDR =
SADEN =
Given
=
1100 0000
1111 1110
1100 000X
In the above example SADDR is the same and the SADEN data is
used to differentiate between the two slaves. Slave 0 requires a 0 in
bit 0 and it ignores bit 1. Slave 1 requires a 0 in bit 1 and bit 0 is
ignored. A unique address for Slave 0 would be 1100 0010 since
slave 1 requires a 0 in bit 1. A unique address for slave 1 would be
1100 0001 since a 1 in bit 0 will exclude slave 0. Both slaves can be
selected at the same time by an address which has bit 0 = 0 (for
slave 0) and bit 1 = 0 (for slave 1). Thus, both could be addressed
with 1100 0000.
Automatic Address Recognition
Automatic Address Recognition is a feature which allows the UART
to recognize certain addresses in the serial bit stream by using
hardware to make the comparisons. This feature saves a great deal
of software overhead by eliminating the need for the software to
examine every serial address which passes by the serial port. This
feature is enabled by setting the SM2 bit in SCON. In the 9 bit UART
modes, mode 2 and mode 3, the Receive Interrupt flag (RI) will be
automatically set when the received byte contains either the “Given”
address or the “Broadcast” address. The 9 bit mode requires that
the 9th information bit is a 1 to indicate that the received information
is an address and not data. Automatic address recognition is shown
in Figure 7.
In a more complex system the following could be used to select
slaves 1 and 2 while excluding slave 0:
The 8 bit mode is called Mode 1. In this mode the RI flag will be set
if SM2 is enabled and the information received has a valid stop bit
following the 8 address bits and the information is either a Given or
Broadcast address.
Mode 0 is the Shift Register mode and SM2 is ignored.
Using the Automatic Address Recognition feature allows a master to
selectively communicate with one or more slaves by invoking the
1998 Apr 23
Slave 0
10
Slave 0
SADDR =
SADEN =
Given
=
1100 0000
1111 1001
1100 0XX0
Slave 1
SADDR =
SADEN =
Given
=
1110 0000
1111 1010
1110 0X0X
Slave 2
SADDR =
SADEN =
Given
=
1110 0000
1111 1100
1110 00XX
Philips Semiconductors
Preliminary specification
80C51 8-bit microcontroller family
8K/256 OTP/ROM, expanded I/O
83C453/87C453
does not change the on-chip RAM. An external interrupt allows both
the SFRs and the on-chip RAM to retain their values.
In the above example the differentiation among the 3 slaves is in the
lower 3 address bits. Slave 0 requires that bit 0 = 0 and it can be
uniquely addressed by 1110 0110. Slave 1 requires that bit 1 = 0 and
it can be uniquely addressed by 1110 and 0101. Slave 2 requires
that bit 2 = 0 and its unique address is 1110 0011. To select Slaves 0
and 1 and exclude Slave 2 use address 1110 0100, since it is
necessary t make bit 2 = 1 to exclude slave 2.
To properly terminate Power Down the reset or external interrupt
should not be executed before VCC is restored to its normal
operating level and must be held active long enough for the
oscillator to restart and stabilize (normally less than 10ms).
With an external interrupt, INT0 and INT1 must be enabled and
configured as level-sensitive. Holding the pin low restarts the
oscillator but bringing the pin back high completes the exit. Once the
interrupt is serviced, the next instruction to be executed after RETI
will be the one following the instruction that put the device into
Power Down.
The Broadcast Address for each slave is created by taking the
logical OR of SADDR and SADEN. Zeros in this result are teated as
don’t-cares. In most cases, interpreting the don’t-cares as ones, the
broadcast address will be FF hexadecimal.
Upon reset SADDR (SFR address 0A9H) and SADEN (SFR
address 0B9H) are leaded with 0s. This produces a given address
of all “don’t cares” as well as a Broadcast address of all “don’t
cares”. this effectively disables the Automatic Addressing mode and
allows the microcontroller to use standard 80C51 type UART drivers
which do not make use of this feature.
Power Off Flag
The Power Off Flag (POF) in PCON is set by on-chip circuitry when
the VCC level on the 87C453 rises from 0 to 5V. The POF bit can be
set or cleared by software allowing a user to determine if the reset is
the result of a power-on or a warm start after powerdown. The VCC
level must remain above 3V for the POF to remain unaffected by the
VCC level.
The 87C453 UART has all of the capabilities of the standard 80C51
UART plus Framing Error Detection and Automatic Address
Recognition. As in the 80C51, all four modes of operation are
supported as well as the 9th bit in modes 2 and 3 that can be used
to facilitate multiprocessor communication.
Design Consideration
• When the idle mode is terminated by a hardware reset, the device
normally resumes program execution, from where it left off, up to
two machine cycles before the internal rest algorithm takes
control. On-chip hardware inhibits access to internal RAM in this
event, but access to the port pins is not inhibited. To eliminate the
possibility of an unexpected write when Idle is terminated by reset,
the instruction following the one that invokes Idle should not be
one that writes to a port pin or to external memory.
OSCILLATOR CHARACTERISTICS
XTAL1 and XTAL2 are the input and output, respectively, of an
inverting amplifier. The pins can be configured for use as an on-chip
oscillator.
To drive the device from an external clock source, XTAL1 should be
driven while XTAL2 is left unconnected. There are no requirements
on the duty cycle of the external clock signal, because the input to
the internal clock circuitry is through a divide-by-two flip-flop.
However, minimum and maximum high and low times specified in
the data sheet must be observed.
ONCE Mode
The ONCE (“On-Circuit Emulation”) Mode facilitates testing and
debugging of systems using the 87C453 without having to remove
the IC from the circuit. The ONCE Mode is invoked by:
1. Pull ALE low while the device is in reset and PSEN is high;
Reset
2. Hold ALE low as RST is deactivated.
A reset is accomplished by holding the RST pin high for at least two
machine cycles (24 oscillator periods), while the oscillator is running.
To insure a good power-on reset, the RST pin must be high long
enough to allow the oscillator time to start up (normally a few
milliseconds) plus two machine cycles. At power-on, the voltage on
VCC and RST must come up at the same time for a proper start-up.
While the device is in ONCE Mode, the Port 0 pins go into a float
state, and the other port pins and ALE and PSEN are weakly pulled
high. The oscillator circuit remains active. While the 87C453 is in
this mode, an emulator or test CPU can be used to drive the circuit.
Normal operation is restored when a normal reset is applied.
Idle Mode
PORTS 4 AND 5
Ports 4 and 5 are bidirectional I/O ports with internal pull-ups. Port 4
is an 8-bit port. Port 4 and port 5 pins with ones written to them, are
pulled high by the internal pull-ups, and in that state can be used as
inputs. Ports 4 and 5 are addressed at the special function register
addresses shown in Table 3.
In the idle mode, the CPU puts itself to sleep while all of the on-chip
peripherals stay active. The instruction to invoke the idle mode is the
last instruction executed in the normal operating mode before the
idle mode is activated. The CPU contents, the on-chip RAM, and all
of the special function registers remain intact during this mode. The
idle mode can be terminated either by any enabled interrupt (at
which time the process is picked up at the interrupt service routine
and continued), or by a hardware reset which starts the processor in
the same manner as a power-on reset.
PORT 6
Port 6 is a special 8-bit bidirectional I/O port with internal pull-ups
(see Figure 8). This port can be used as a standard I/O port, or in
strobed modes of operation in conjunction with four special control
lines: ODS, IDS, AFLAG, and BFLAG. Port 6 operating modes are
controlled by the port 6 control status register (CSR). Port 6 and the
CSR are addressed at the special function register addresses
shown in Table 3. The following four control pins are used in
conjunction with port 6:
Power-Down Mode
To save even more power, a Power Down mode can be invoked by
software. In this mode, the oscillator is stopped and the instruction
that invoked Power Down is the last instruction executed. The
on-chip RAM and Special Function Registers retain their values until
the Power Down mode is terminated.
ODS – Output data strobe for port 6. ODS can be programmed to
control the port 6 output drivers and the output buffer full flag (OBF),
or to clear only the OBF flag bit in the CSR (output-always mode).
On the 87C453 either a hardware reset or external interrupt can
cause an exit from Power Down. Reset redefines all the SFRs but
1998 Apr 23
11
Philips Semiconductors
Preliminary specification
80C51 8-bit microcontroller family
8K/256 OTP/ROM, expanded I/O
83C453/87C453
CSR.3 Output Buffer Full Flag Clear Mode (OBFC) – When
CSR.3 = 1, the positive edge of the ODS input clears the OBF flag.
When CSR.3 = 0, the negative edge of the ODS input clears the
OBF flag.
ODS is active low for output driver control. The OBF flag can be
programmed to be cleared on the negative or positive edge of ODS.
Can produce an IOB interrupt (see Figure 2).
IDS – Input data strobe for port 6. IDS is used to control the port 6
input latch and input buffer full flag (IBF) bit in the CSR. The input
data latch can be programmed to be transparent when IDS is low
and latched on the positive transition of IDS, or to latch only on the
positive transition of IDS. Correspondingly, the IBF flag is set on the
negative or positive transition of IDS. Can produce an IIB interrupt
(see Figure 2).
CSR.4, CSR.5 AFLAG Mode Select (MA0, MA1) – Bits 4 and 5
select the mode of operation for the AFLAG pin as follows:
MA1
0
0
1
1
AFLAG – AFLAG is a bidirectional I/O pin which can be
programmed to be an output set high or low under program control,
or to output the state of the output buffer full flag. AFLAG can also
be programmed to be an input which selects whether the contents of
the output buffer, or the contents of the port 6 control status register
will output on port 6. This feature grants complete port 6 status to
external devices.
AFLAG Function
Logic 0 output
Logic 1 output
OBF flag output (CSR.1)
Select (SEL) input mode
The select (SEL) input mode is used to determine whether the port 6
data register or the control status register is output on port 6. When
the select feature is enabled, the AFLAG input controls the source of
port 6 output data. A logic 0 on AFLAG input selects the port 6 data
register, and a logic 1 on AFLAG input selects the control status
register.
BFLAG – BFLAG is a bidirectional I/O pin which can be
programmed to be an output, set high or low under program control,
or to output the state of the input buffer full flag. BFLAG can also be
programmed to input an enable signal for port 6. When BFLAG is
used as an enable input, port 6 output drivers are in the
high-impedance state, and the input latch does not respond to the
IDS strobe when BFLAG is high. Both features are enabled when
BFLAG is low. This feature facilitates the use of the 87C453 in
bused multiprocessor systems.
The value of the AFLAG input is latched into the Auxiliary Register
(AUXR) bit 1 (AUXR.1). Checking this bit (AF) will allow the
87C453’s program to determine if Port 6 was loaded with data or a
UPI command.
CSR.6, CSR.7 BFLAG Mode Select (MB0, MB1) – Bits 6 and 7
select the mode operation as follows:
MB1 MB0
0
0
0
1
1
0
1
1
CONTROL STATUS REGISTER
The control status register (CSR) establishes the mode of operation
for port 6 and indicates the current status of port 6 I/O registers. All
control status register bits can be read and written by the CPU,
except bits 0 and 1, which are read only. Reset writes ones to bits 2
through 7, and writes zeros to bits 0 and 1 (see Table 4).
BFLAG Function
Logic 0 output
Logic 1 output
IBF flag output (CSR.0)
Port enable (PE)
In the port enable mode, IDS and ODS inputs are disabled when
BFLAG input is high. When the BFLAG input is low, the port is
enabled for I/O.
Reduced EMI Mode – The on–chip clock distribution drivers have
been identified as the cause of most of the EMI emissions from the
80C51 family. By tailoring the clock drivers properly, a compromise
between maximum operating speed and minimal EMI emissions can
be achieved. Typically, an order in magnitude of reduction is
possible over previous designs. This feature has been implemented
on this chip along with the additional capability of turning off the ALE
output. Setting the AO bit (AUXR.0) in the AUXR special function
register will disable the ALE output. Reset forces a 0 into AUXR.0 to
enable normal 80C51 type operation.
CSR.0 Input Buffer Full Flag (IBF) (Read Only) – The IBF bit is
set to a logic 1 when port 6 data is loaded into the input buffer under
control of IDS. This can occur on the negative or positive edge of
IDS, as determined by CSR.2. When IBF is set, the Interrupt Enable
Register bit IIB (IE.5) is set. The Interrupt Service Routine vector
address for this interrupt is 002BH. IBF is cleared when the CPU
reads the input buffer register.
CSR.1 Output Buffer Full Flag (OBF) (Read Only) – The OBF flag
is set to a logic 1 when the CPU writes to the port 6 output data
buffer. OBF is cleared by the positive or negative edge of ODS, as
determined by CSR.3. When OBF is cleared, the Interrupt Enable
Register bit IOB (IE.6) is set. The Interrupt Service Routine vector
address for this interrupt is 0033H.
Auxiliary Register (AUXR)
7
6
5
4
–
CSR.2 IDS Mode Select (IDSM) – When CSR.2 = 0, a low-to-high
transition on the IDS pin sets the IBF flag. The Port 6 input buffer is
loaded on the IDS positive edge. When CSR.2 = 1, a high-to-low
transition on the IDS pin sets the IBF flag. Port 6 input buffer is
transparent when IDS is low, and latched when IDS is high.
1998 Apr 23
MA0
0
1
0
1
–
–
–
3
2
1
0
–
–
AF
AO
Latched value of AFLAG when Port 6
inputs data from IDS strobe
0 = ALE enabled
1 = ALE disabled
12
Philips Semiconductors
Preliminary specification
80C51 8-bit microcontroller family
8K/256 OTP/ROM, expanded I/O
AFLAG
PORT 6
BFLAG ODS
BFLAG/ODS
MODE
(CSR.6/.7)
AFLAG
MODE
(CSR.4/.5)
83C453/87C453
IDS
INPUT
BUFFER
(P6 READ)
OUTPUT
DRIVERS
IDS
MODE
INPUT BUFFER
FULL (CSR.0)
EDGE/LEVEL
SELECT (CSR.2)
MUX
OUTPUT BUFFER
FULL (CSR.1)
CONTROL/STATUS
REGISTER (CSR)
OUTPUT BUFFER
(P6 WRITE)
INTERNAL BUS
SU00087
Figure 8. Port 6 Block Diagram
Table 3. Special Function Register Addresses
REGISTER ADDRESS
Name
BIT ADDRESS
Symbol
Address
MSB
Port 4
Port 5
Port 6 data
Port 6 control status
P4
P5
P6
CSR
C0
C8
D8
E8
C7
CF
DF
EF
Slave address
Slave address mask
SADDR
SADEN
A9
B9
AUXR
8E
Auxiliary Register
LSB
C6
CE
DE
EE
C5
CD
DD
ED
C4
CC
DC
EC
C3
CB
DB
EB
C2
CA
DA
EA
C1
C9
D9
E9
C0
C8
D8
E8
Table 4. Control Status Register (CSR)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
MB1
MB0
MA1
MA0
OBFC
IDSM
OBF
Bit 0
IBF
BFLAG Mode Select
AFLAG Mode Select
Output Buffer
Flag Clear
Mode
Input Data
Strobe Mode
Output Buffer
Flag Full
Input Buffer
Flag Full
0/0 = Logic 0 output*
0/1 = Logic 1 output*
1/0 = IBF output
1/1 = PE input
(0 = Select)
(1 = Disable I/O)
0/0 = Logic 0 output*
0/1 = Logic 1 output*
1/0 = OBF output
1/1 = SEL input
(0 = Select)
(1 = Control/status)
0 = Negative
edge of ODS
1 = Positive
edge o ODS
0 = Positive
edge of IDS
1 = Low level
of IDS
0 = Output
data buffer
empty
1 = Output
data buffer full
0 = Input data
buffer empty
1 = Input data
buffer full
NOTE:
* Output-always mode: MB1 = 0, MA1 = 1, and MA0 = 0. In this mode, port 6 is always enabled for output. ODS only clears the OBF flag.
1998 Apr 23
13
Philips Semiconductors
Preliminary specification
80C51 8-bit microcontroller family
8K/256 OTP/ROM, expanded I/O
83C453/87C453
ABSOLUTE MAXIMUM RATINGS1, 2, 3
PARAMETER
RATING
UNIT
0 to +70
°C
Storage temperature range
–65 to +150
°C
Voltage on any other pin to VSS
–0.5 to +6.5
V
1.5
W
Operating temperature under bias
Power dissipation (based on package heat transfer limitations, not device power consumption)
NOTES:
1. Stresses above those listed under Absolute Maximum Ratings 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 the AC and DC Electrical Characteristics section
of this specification is not implied.
2. 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 maxima.
3. Parameters are valid over operating temperature range unless otherwise specified. Voltages are with respect to VSS unless otherwise noted.
DC ELECTRICAL CHARACTERISTICS
Tamb = 0°C to +70°C, VCC = 5V ±10%, VSS = 0V
TEST
SYMBOL
PARAMETER
CONDITIONS
LIMITS
MIN
TYP1
MAX
UNIT
–0.5
0.2VCC–0.1
V
VIL
Input low voltage; ports 0, 1, 2, 3, 4, 5, 6, IDS, ODS,
AFLAG, BFLAG; except EA
VIL1
Input low voltage to EA
VIH
Input high voltage; except XTAL1, RST
VIH1
Input high voltage; XTAL1, RST
VOL
Output low voltage; ports 1, 2, 3, 4, 5, 6, AFLAG,
BFLAG
IOL = 1.6mA2
VOL1
Output low voltage; port 0, ALE, PSEN
IOL = 3.2mA2
VOH
Output high voltage; ports 1, 2, 3, 4, 5, 6, AFLAG,
BFLAG
IOH = –60µA,
IOH = –25µA
IOH = –10µA
2.4
0.75VCC
0.9VCC
V
V
V
VOH1
Output high voltage (port 0 in external bus mode, ALE,
PSEN)3
IOH = –800µA,
IOH = –300µA
IOH = –80µA
2.4
0.75VCC
0.9VCC
V
V
V
IIL
Logical 0 input current,; ports 1, 2, 3, 4, 5, 6
VIN = 0.45V
–50
µA
ITL
Logical 1-to-0 transition current; ports 1, 2, 3, 4, 5, 6
See note 4
–650
µA
ILI
Input leakage current; port 0
VIN = VIL or VIH
±10
µA
ICC
Power supply current:
Active mode @ 16MHz5
Idle mode @ 16MHz5
Power down mode
See note 6
25
4
50
mA
mA
µA
300
kΩ
RRST
0
0.2VCC–0.3
V
0.2VCC+0.9
VCC+0.5
V
0.7VCC
VCC+0.5
V
0.45
V
0.45
V
11.5
1.3
3
Internal reset pull-down resistor
50
CIO
Pin capacitance7 – PLCC package
10
pF
NOTES:
1. Typical ratings are based on a limited number of samples from early manufacturing lots, and not guaranteed. Values are room temp., 5V.
2. Capacitive loading on ports 0 and 2 may cause spurious noise to be superimposed on the VOLs of ALE and the other ports. The noise is due
to external bus capacitance discharging into the port 0 and port 2 pins when these pins make 1-to-0 transitions during bus operations. In the
worst cases (capacitive loading > 100pF), the noise pulse on the ALE pin may exceed 0.8V. In such cases, it may be desirable to qualify
ALE with a Schmitt Trigger, or use an address latch with a Schmitt Trigger STROBE input..
3. Capacitive loading on ports 0 and 2 may cause the VOH on ALE and PSEN to momentarily fall below the 0.9VCC specification when the
address bits are stabilizing.
4. Pins of ports 1, 2, 3, 4, 5 and 6 source a transition current when they are being externally driven from 1 to 0. The transition current reaches
its maximum value when VIN is approximately 2V.
5. ICCMAX at other frequencies is given by:
Active mode: ICCMAX = 0.94 X FREQ + 13.71
Idle mode: ICCMAX = 0.14 X FREQ +2.31
where FREQ is the external oscillator frequency in MHz. ICCMAX is given in mA. See Figure 20.
6. See Figures 21 through 24 for ICC test conditions.
7. CIO applies to ports 1 through 6, IDS, ODS, AFLAG, BFLAG, XTAL1, XTAL2.
1998 Apr 23
14
Philips Semiconductors
Preliminary specification
80C51 8-bit microcontroller family
8K/256 OTP/ROM, expanded I/O
83C453/87C453
AC ELECTRICAL CHARACTERISTICS
Tamb = 0°C to +70°C, VCC = 5V ±10%, VSS = 0V
16MHz CLOCK
SYMBOL
FIGURE
1/tCLCL
PARAMETER
MIN
MAX
Oscillator frequency
VARIABLE CLOCK
MIN
MAX
UNIT
3.5
16
MHz
tLHLL
9
ALE pulse width
85
2tCLCL–40
ns
tAVLL
9
Address valid to ALE low
22
tCLCL–40
ns
tLLAX
9
Address hold after ALE low
32
tCLCL–30
ns
tLLIV
9
ALE low to valid instruction in
tLLPL
9
ALE low to PSEN low
32
tPLPH
9
PSEN pulse width
142
tPLIV
9
PSEN low to valid instruction in
tPXIX
9
Input instruction hold after PSEN
tPXIZ
9
Input instruction float after PSEN
37
tCLCL–25
ns
tAVIV
9
Address to valid instruction in
207
5tCLCL–105
ns
tPLAZ
9
PSEN low to address float
10
10
ns
150
4tCLCL–100
tCLCL–30
ns
3tCLCL–45
82
0
ns
ns
3tCLCL–105
0
ns
ns
Data Memory
tRLRH
10, 11
RD pulse width
275
6tCLCL–100
ns
tWLWH
10, 11
WR pulse width
275
6tCLCL–100
ns
tRLDV
10, 11
RD low to valid data in
tRHDX
10, 11
Data hold after RD
tRHDZ
10, 11
Data float after RD
65
2tCLCL–60
ns
tLLDV
10, 11
ALE low to valid data in
350
8tCLCL–150
ns
tAVDV
10, 11
Address to valid data in
9tCLCL–165
ns
tLLWL
10, 11
ALE low to RD or WR low
137
3tCLCL+50
ns
tAVWL
10, 11
Address valid to WR low or RD low
122
4tCLCL–130
ns
tQVWX
10, 11
Data valid to WR transition
13
tCLCL–50
ns
tWHQX
10, 11
Data hold after WR
13
tCLCL–50
ns
tRLAZ
10, 11
RD low to address float
tWHLH
10, 11
RD or WR high to ALE high
23
tXLXL
12
Serial port clock cycle time
750
12tCLCL
ns
tQVXH
12
Output data setup to clock rising edge
492
10tCLCL–133
ns
tXHQX
12
Output data hold after clock rising edge
8
2tCLCL–117
ns
tXHDX
12
Input data hold after clock rising edge
0
0
ns
tXHDV
12
Clock rising edge to input data valid
147
0
5tCLCL–165
0
397
239
3tCLCL–50
0
103
tCLCL–40
ns
ns
0
ns
tCLCL+40
ns
Shift Register
492
10tCLCL–133
ns
Port 6 input (input rise and fall times = 5ns)
tFLFH
15
PE width
209
3tCLCL+20
ns
tILIH
15
IDS width
209
3tCLCL+20
ns
tDVIH
15
Data setup to IDS high or PE high
0
0
ns
tIHDZ
15
Data hold after IDS high or PE high
30
30
ns
tIVFV
16
IDS to BFLAG (IBF) delay
1998 Apr 23
130
15
130
ns
Philips Semiconductors
Preliminary specification
80C51 8-bit microcontroller family
8K/256 OTP/ROM, expanded I/O
83C453/87C453
AC ELECTRICAL CHARACTERISTICS (Continued)
16MHz CLOCK
SYMBOL
FIGURE
PARAMETER
MIN
VARIABLE CLOCK
MAX
MIN
MAX
UNIT
Port 6 output
tOLOH
13
ODS width
209
3tCLCL+20
tFVDV
14
SEL to data out delay
85
85
ns
tOLDV
13
ODS to data out delay
80
80
ns
tOHDZ
13
ODS to data float delay
35
35
ns
tOVFV
13
ODS to AFLAG (OBF) delay
100
100
ns
tFLDV
13
PE to data out delay
120
ns
tOHFH
14
ODS to AFLAG (SEL) delay
100
100
ns
tCHCX
17
High time
20
20
ns
tCLCX
17
Low time
20
tCLCH
17
Rise time
20
20
ns
tCHCL
17
Fall time
20
20
ns
120
ns
External Clock
20
NOTES:
1. Parameters are valid over operating temperature range unless otherwise specified.
2. Load capacitance for port 0, ALE, and PSEN = 100pF, load capacitance for all other outputs = 80pF.
1998 Apr 23
16
ns
Philips Semiconductors
Preliminary specification
80C51 8-bit microcontroller family
8K/256 OTP/ROM, expanded I/O
83C453/87C453
EXPLANATION OF THE AC SYMBOLS
P – PSEN
Q – Output data
R – RD signal
t – Time
V – Valid
W – WR signal
X – No longer a valid logic level
Z – Float
Examples: tAVLL = Time for address valid to ALE low.
tLLPL = Time for ALE low to PSEN low.
Each timing symbol has five characters. The first character is always
‘t’ (= time). The other characters, depending on their positions,
indicate the name of a signal or the logical status of that signal.
The designations are:
A – Address
C – Clock
D – Input data
H – Logic level high
I – Instruction (program memory contents)
L – Logic level low, or ALE
tLHLL
ALE
tAVLL
tLLPL
tPLPH
tLLIV
PSEN
tPLIV
tLLAX
A0–A7
PORT 0
tPXIZ
tPLAZ
tPXIX
A0–A7
INSTR IN
tAVIV
PORT 2
A0–A15
A8–A15
SU00056
Figure 9. External Program Memory Read Cycle
ALE
tWHLH
PSEN
tLLDV
tLLWL
tRLRH
RD
tAVLL
tLLAX
tRLAZ
PORT 0
tRHDZ
tRLDV
tRHDX
A0–A7
FROM RI OR DPL
DATA IN
A0–A7 FROM PCL
INSTR IN
tAVWL
tAVDV
PORT 2
P2.0–P2.7 OR A8–A15 FROM DPH
A0–A15 FROM PCH
SU00007
Figure 10. External Data Memory Read Cycle
1998 Apr 23
17
Philips Semiconductors
Preliminary specification
80C51 8-bit microcontroller family
8K/256 OTP/ROM, expanded I/O
83C453/87C453
ALE
tWHLH
PSEN
tWLWH
tLLWL
WR
tLLAX
tAVLL
A0–A7
FROM RI OR DPL
PORT 0
tWHQX
tQVWX
DATA OUT
A0–A7 FROM PCL
INSTR IN
tAVWL
PORT 2
P2.0–P2.7 OR A8–A15 FROM DPH
A0–A15 FROM PCH
SU00008
Figure 11. External Data Memory Write Cycle
INSTRUCTION
0
1
2
3
4
5
6
7
8
ALE
tXLXL
CLOCK
tXHQX
tQVXH
OUTPUT DATA
0
1
WRITE TO SBUF
2
3
4
5
6
7
tXHDX
tXHDV
SET TI
INPUT DATA
VALID
VALID
VALID
VALID
VALID
VALID
VALID
VALID
CLEAR RI
SET RI
SU00027
Figure 12. Shift Register Mode Timing
1998 Apr 23
18
Philips Semiconductors
Preliminary specification
80C51 8-bit microcontroller family
8K/256 OTP/ROM, expanded I/O
83C453/87C453
OBF (AFLAG)
tOVFV
tOVFV
PE (BFLAG)
tOLOH
ODS
tOLDV
tOHDZ
PORT 6
tFLDV
SU00088
Figure 13. Port 6 Output
ODS
tOHFH
SEL (AFLAG)
tFVDV
PORT 6
DATA
tFVDV
CSR
DATA
SU00089
Figure 14. Port 6 Select Mode
tFLFH
PE (BFLAG)
tILIH
IDS
tDVIH
tIHDZ
PORT 6
SU00090
Figure 15. Port 6 Input
IBF (BFLAG)
tIVFV
tIVFV
IDS
SU00091A
Figure 16. IBF Flag Output
1998 Apr 23
19
Philips Semiconductors
Preliminary specification
80C51 8-bit microcontroller family
8K/256 OTP/ROM, expanded I/O
VCC–0.5
83C453/87C453
0.7VCC
0.2VCC–0.1
0.45V
tCHCL
tCHCX
tCLCH
tCLCX
tCLCL
SU00009
Figure 17. External Clock Drive
VCC–0.5
VLOAD+0.1V
0.2VCC+0.9
TIMING
REFERENCE
POINTS
VLOAD
0.45V
0.2VCC–0.1
VLOAD–0.1V
SU00717
SU00718
Figure 18. AC Testing Input/Output
Figure 19. Float Waveform
30
MAX ACTIVE MODE
25
20
TYP ACTIVE MODE
15
10
5
MAX IDLE MODE
TYP IDLE MODE
4MHz
8MHz
12MHz
16MHz
FREQ AT XTAL1
VALID ONLY WITHIN FREQUENCY SPECIFICATIONS OF THE DEVICE UNDER TEST.
SU00092
Figure 20. ICC vs. FREQ
1998 Apr 23
VOL+0.1V
NOTE:
For timing purposes, a port is no longer floating when a 100mV change from
load voltage occurs, and begins to float when a 100mV change from the loaded
VOH/VOL level occurs. IOH/IOL ≥ ±20mA.
NOTE:
AC inputs during testing are driven at VCC –0.5 for a logic ‘1’ and 0.45V for a logic ‘0’.
Timing measurements are made at VIH min for a logic ‘1’ and VIL max for a logic ‘0’.
ICC mA
VOH–0.1V
20
Philips Semiconductors
Preliminary specification
80C51 8-bit microcontroller family
8K/256 OTP/ROM, expanded I/O
83C453/87C453
VCC
VCC
ICC
ICC
VCC
VCC
VCC
VCC
RST
(NC)
XTAL2
CLOCK SIGNAL
XTAL1
VCC
RST
P0
P0
EA
EA
VCC
(NC)
XTAL2
CLOCK SIGNAL
XTAL1
VCC
IDS
VSS
VSS
ODS
IDS
ODS
SU00093
SU00094
Figure 21. ICC Test Condition, Active Mode
All other pins are disconnected
VCC–0.5
0.45V
Figure 22. ICC Test Condition, Idle Mode
All other pins are disconnected
0.7VCC
0.2VCC–0.1
tCHCL
tCHCX
tCLCH
tCLCX
tCLCL
SU00009
Figure 23. Clock Signal Waveform for ICC Tests in Active and Idle Modes
tCLCH = tCHCL = 5ns
VCC
ICC
VCC
RST
VCC
P0
EA
(NC)
XTAL2
VCC
XTAL1
VSS
IDS
ODS
SU00095
Figure 24. ICC Test Condition, Power Down Mode
All other pins are disconnected. VCC = 2V to 5.5V
1998 Apr 23
21
Philips Semiconductors
Preliminary specification
80C51 8-bit microcontroller family
8K/256 OTP/ROM, expanded I/O
83C453/87C453
Program Verification
If lock bit 2 has not been programmed, the on-chip program memory
can be read out for program verification. The address of the program
memory locations to be read is applied to ports 1 and 2 as shown in
Figure 27. The other pins are held at the ‘Verify Code Data’ levels
indicated in Table 5. The contents of the address location will be
emitted on port 0. External pull-ups are required on port 0 for this
operation.
EPROM CHARACTERISTICS
The 87C453 is programmed by using a modified Quick-Pulse
Programming algorithm. It differs from older methods in the value
used for VPP (programming supply voltage) and in the width and
number of the ALE/PROG pulses.
The 87C453 contains two signature bytes that can be read and used
by an EPROM programming system to identify the device. The
signature bytes identify the device as an 87C453 manufactured by
Philips Semiconductors.
If the encryption table has been programmed, the data presented at
port 0 will be the exclusive NOR of the program byte with one of the
encryption bytes. The user will have to know the encryption table
contents in order to correctly decode the verification data. The
encryption table itself cannot be read out.
Table 5 shows the logic levels for reading the signature byte, and for
programming the program memory, the encryption table, and the
lock bits. The circuit configuration and waveforms for quick-pulse
programming are shown in Figures 25 and 26. Figure 27 shows the
circuit configuration for normal program memory verification.
Reading the Signature Bytes
The signature bytes are read by the same procedure as a normal
verification of locations 030H and 031H, except that P3.6 and P3.7
need to be pulled to a logic low. The values are:
(030H) = 15H indicates manufactured by Philips
(031H) = B9H indicates 87C453
Quick-Pulse Programming
The setup for microcontroller quick-pulse programming is shown in
Figure 26. Note that the 87C453 is running with a 4 to 6MHz
oscillator. The reason the oscillator needs to be running is that the
device is executing internal address and program data transfers.
Program/Verify Algorithms
The address of the EPROM location to be programmed is applied to
ports 1 and 2, as shown in Figure 25. The code byte to be
programmed into that location is applied to port 0. RST, PSEN and
pins of ports 2 and 3 specified in Table 5 are held at the ‘Program
Code Data’ levels indicated in Table 5. The ALE/PROG is pulsed
low 15 to 25 times, as shown in Figure 26.
Any algorithm in agreement with the conditions listed in Table 5, and
which satisfies the timing specifications, is suitable.
Erasure Characteristics
Erasure of the EPROM begins to occur when the chip is exposed to
light with wavelengths shorter than approximately 4,000 angstroms.
Since sunlight and fluorescent lighting have wavelengths in this
range, exposure to these light sources over an extended time (about
1 week in sunlight, or 3 years in room level fluorescent lighting)
could cause inadvertent erasure. For this and secondary effects,
it is recommended that an opaque label be placed over the
window. For elevated temperature or environments where solvents
are being used, apply Kapton tape Fluorglas part number 2345–5, or
equivalent.
To program the encryption table, repeat the 15 to 25 pulse
programming sequence for addresses 0 through 1FH, using the
‘Pgm Encryption Table’ levels. Do not forget that after the encryption
table is programmed, verification cycles will produce only encrypted
data.
To program the lock bits, repeat the 15 to 25 pulse programming
sequence using the ‘Pgm Lock Bit’ levels. After one lock bit is
programmed, further programming of the code memory and
encryption table is disabled. However, the other lock bit can still be
programmed.
The recommended erasure procedure is exposure to ultraviolet light
(at 2537 angstroms) to an integrated dose of at least 15W-sec/cm2.
Exposing the EPROM to an ultraviolet lamp of 12,000µW/cm2 rating
for 20 to 39 minutes, at a distance of about 1 inch, should be
sufficient.
Note that the EA/VPP pin must not be allowed to go above the
maximum specified VPP level for any amount of time. Even a narrow
glitch above that voltage can cause permanent damage to the
device. The VPP source should be well regulated and free of glitches
and overshoot.
Erasure leaves the array in an all 1s state.
Table 5. EPROM Programming Modes
MODE
RST
PSEN
ALE/PROG
EA/VPP
P2.7
P2.6
P3.7
P3.6
Read signature
1
0
Program code data
1
0
1
1
0
0
0
0
0*
VPP
1
0
1
1
Verify code data
1
0
Pgm encryption table
1
0
1
1
0
0
1
1
0*
VPP
1
0
1
0
Pgm lock bit 1
1
0
0*
VPP
1
1
1
1
Pgm lock bit 2
1
0
0*
VPP
1
1
0
0
NOTES:
1. ‘0’ = Valid low for that pin, ‘1’ = valid high for that pin.
2. VPP = 12.75V ±0.25V.
3. VCC = 5V ±10% during programming and verification.
* ALE/PROG receives 15 to 25 programming pulses while VPP is held at 12.75V. Each programming pulse is low for 100µs (±10µs) and high
for a minimum of 10µs.
Trademark phrase of Intel Corporation.
1998 Apr 23
22
Philips Semiconductors
Preliminary specification
80C51 8-bit microcontroller family
8K/256 OTP/ROM, expanded I/O
83C453/87C453
+5V
VCC
A0–A7
P0
P1
1
RST
EA/VPP
1
P3.6
ALE/PROG
1
P3.7
87C453
XTAL2
4–6MHz
XTAL1
PGM DATA
+12.75V
15 TO 25 100µs PULSES TO GROUND
PSEN
0
P2.7
1
P2.6
0
A8–A12
P2.0–P2.4
VSS
SU00159
Figure 25. Programming Configuration
15 TO 25 PULSES
1
ALE/PROG:
0
10µs MIN
100µs+10
1
0
ALE/PROG:
SU00160
Figure 26. PROG Waveform
+5V
VCC
A0–A7
P0
P1
PGM DATA
1
RST
EA/VPP
1
1
P3.6
ALE/PROG
1
1
P3.7
PSEN
0
87C453
XTAL2
4–6MHz
XTAL1
P2.7
0 ENABLE
P2.6
0
P2.0–P2.4
A8–A12
VSS
SU00161
Figure 27. Program Verification
1998 Apr 23
23
Philips Semiconductors
Preliminary specification
80C51 8-bit microcontroller family
8K/256 OTP/ROM, expanded I/O
83C453/87C453
EPROM PROGRAMMING AND VERIFICATION CHARACTERISTICS
Tamb = 21°C to +27°C, VCC = 5V±10%, VSS = 0V (See Figure 28)
SYMBOL
PARAMETER
MIN
MAX
UNIT
12.5
13.0
V
VPP
Programming supply voltage
IPP
Programming supply current
1/tCLCL
Oscillator frequency
tAVGL
Address setup to PROG low
48tCLCL
tGHAX
Address hold after PROG
48tCLCL
tDVGL
Data setup to PROG low
48tCLCL
tGHDX
Data hold after PROG
48tCLCL
tEHSH
P2.7 (ENABLE) high to VPP
48tCLCL
tSHGL
VPP setup to PROG low
10
µs
tGHSL
VPP hold after PROG
10
µs
tGLGH
PROG width
90
tAVQV
Address to data valid
48tCLCL
tELQZ
ENABLE low to data valid
48tCLCL
tEHQZ
Data float after ENABLE
0
tGHGL
PROG high to PROG low
10
4
mA
6
MHz
110
µs
48tCLCL
µs
PROGRAMMING*
VERIFICATION*
ADDRESS
ADDRESS
P1.0–P1.7
P2.0–P2.4
50
tAVQV
DATA IN
PORT 0
DATA OUT
tDVGL
tAVGL
tGHDX
tGHAX
ALE/PROG
tGLGH
tSHGL
tGHGL
tGHSL
LOGIC 1
LOGIC 1
EA/VPP
LOGIC 0
tEHSH
tELQV
tEHQZ
P2.7
ENABLE
SU00020
NOTE:
* FOR PROGRAMMING VERIFICATION SEE FIGURE 25.
FOR VERIFICATION CONDITIONS SEE FIGURE 27.
Figure 28. EPROM Programming and Verification
1998 Apr 23
24
Philips Semiconductors
Preliminary specification
80C51 8-bit microcontroller family
8K/256 OTP/ROM, expanded I/O
83C453/87C453
PLCC68: plastic leaded chip carrier; 68 leads; pedestal
1998 Apr 23
25
SOT188-3
Philips Semiconductors
Preliminary specification
80C51 8-bit microcontroller family
8K/256 OTP/ROM, expanded I/O
83C453/87C453
Data sheet status
Data sheet
status
Product
status
Definition [1]
Objective
specification
Development
This data sheet contains the design target or goal specifications for product development.
Specification may change in any manner without notice.
Preliminary
specification
Qualification
This data sheet contains preliminary data, and supplementary data will be published at a later date.
Philips Semiconductors reserves the right to make chages at any time without notice in order to
improve design and supply the best possible product.
Product
specification
Production
This data sheet contains final specifications. Philips Semiconductors reserves the right to make
changes at any time without notice in order to improve design and supply the best possible product.
[1] Please consult the most recently issued datasheet before initiating or completing a design.
Definitions
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.
Limiting values definition — Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). 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.
Disclaimers
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 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.
Right to make changes — Philips Semiconductors reserves the right to make changes, without notice, in the products, including circuits, standard
cells, and/or software, described or contained herein in order to improve design and/or performance. Philips Semiconductors assumes no
responsibility or liability for the use of any of these products, conveys no license 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.
 Copyright Philips Electronics North America Corporation 1998
All rights reserved. Printed in U.S.A.
Philips Semiconductors
811 East Arques Avenue
P.O. Box 3409
Sunnyvale, California 94088–3409
Telephone 800-234-7381
Date of release: 05-98
Document order number:
1998 Apr 23
26
9397 750 03886