Philips Semiconductors
Preliminary specification
8K/256 OTP, 8 channel 10 bit A/D, I
2
C, PWM,
capture/compare, high I/O, low voltage (2.7V–5.5V), low power
80C51 8-bit microcontroller
P87C552
DESCRIPTION
The 87C552 Single-Chip 8-Bit Microcontroller is manufactured in an
advanced CMOS process and is a derivative of the 80C51
microcontroller family. The 87C552 has the same instruction set as
the 80C51.
The 87C552 contains a 8k
×
8 non-volatile EPROM, a 256
×
8
read/write data memory, five 8-bit I/O ports, one 8-bit input port, two
16-bit timer/event counters (identical to the timers of the 80C51), an
additional 16-bit timer coupled to capture and compare latches, a
15-source, four-priority-level, nested interrupt structure, an 8-input
ADC, a dual DAC pulse width modulated interface, two serial
interfaces (UART and I
2
C-bus), a “watchdog” timer and on-chip
oscillator and timing circuits. For systems that require extra
capability, the 8xC552 can be expanded using standard TTL
compatible memories and logic.
In addition, the 8xC552 has two software selectable modes of power
reduction—idle mode and power-down mode. The idle mode freezes
the CPU while allowing the RAM, timers, serial ports, and interrupt
system to continue functioning. Optionally, the ADC can be operated
in Idle mode. The power-down mode saves the RAM contents but
freezes the oscillator, causing all other chip functions to be
inoperative.
The device also functions as an arithmetic processor having
facilities for both binary and BCD arithmetic plus bit-handling
capabilities. The instruction set consists of over 100 instructions:
49 one-byte, 45 two-byte, and 17 three-byte. With a 16MHz crystal,
58% of the instructions are executed in 0.75µs and 40% in 1.5µs.
Multiply and divide instructions require 3µs.
FEATURES
•
80C51 central processing unit
•
8k
×
8 EPROM expandable externally to 64k bytes
•
An additional 16-bit timer/counter coupled to four capture registers
and three compare registers
•
Two standard 16-bit timer/counters
•
256
×
8 RAM, expandable externally to 64k bytes
•
Capable of producing eight synchronized, timed outputs
•
A 10-bit ADC with eight multiplexed analog inputs
•
Fast 8-bit ADC option
•
Two 8-bit resolution, pulse width modulation outputs
•
Five 8-bit I/O ports plus one 8-bit input port shared with analog
inputs
•
I
2
C-bus serial I/O port with byte oriented master and slave
functions
•
On-chip watchdog timer
•
Extended temperature ranges
•
Full static operation – 0 to 16 MHz
•
Operating voltage range: 2.7V to 5.5V (0 to 16MHz)
•
Security bits:
– OTP/EPROM – 3 bits
•
Encryption array – 64 bytes
•
4 level priority interrupt
•
15 interrupt sources
•
Full-duplex enhanced UART
– Framing error detection
– Automatic address recognition
•
Power control modes
– Clock can be stopped and resumed
– Idle mode
– Power down mode
•
Second DPTR register
•
ALE inhibit for EMI reduction
•
Programmable I/O pins
•
Wake-up from power-down by external interrupts
•
Software reset
•
Power-on detect reset
•
ADC charge pump disable
•
ONCE mode
•
ADC active in Idle mode
1999 Mar 30
2
Philips Semiconductors
Preliminary specification
80C51 8-bit microcontroller
8K/256 OTP, 8 channel 10 bit A/D, I
2
C, PWM,
capture/compare, high I/O, low voltage (2.7V–5.5V), low power
P87C552
ORDERING INFORMATION
OTP/EPROM
P87C552SBAA
TEMPERATURE
°C
AND PACKAGE
0 to +70, Plastic Leaded Chip Carrier
FREQ.
(MHz)
16
DRAWING NUMBER
SOT188–3
PART NUMBER DERIVATION
DEVICE NUMBER (P87C552)
P87C552 OTP
FREQUENCY MAX (S)
S = 16 MHz
TEMPERATURE RANGE (B)
B = 0_C to 70_C
F = –40_C to 85_C
PACKAGE (AA)
AA = PLCC
BLOCK DIAGRAM
T0
3
T1
3
INT0
3
INT1
3
V
DD
V
SS
PWM0
PWM1
AV
SS
AV
REF
ADC0-7 SDA
SCL
1
1
– +
AV
DD
STADC
5
XTAL1
XTAL2
EA
ALE
PSEN
3
3
RD
0
AD0-7
2
A8-15
PARALLEL I/O
PORTS AND
EXTERNAL BUS
SERIAL
UART
PORT
8-BIT
PORT
FOUR
16-BIT
CAPTURE
LATCHES
16
WR
T0, T1
TWO 16-BIT
TIMER/EVENT
COUNTERS
PROGRAM
MEMORY
8k x 8
OTP/ROM
DATA
MEMORY
512 x 8 RAM
DUAL
PWM
ADC
SERIAL
I
2
C PORT
CPU
80C51 CORE
EXCLUDING
ROM/RAM
8-BIT INTERNAL BUS
T2
16-BIT
TIMER/
EVENT
COUNTERS
16
T2
16-BIT
COMPARA-
TORS
WITH
REGISTERS
COMPARA-
TOR
OUTPUT
SELECTION
T3
WATCHDOG
TIMER
3
P0
P1
P2
P3
TxD
3
RxD
P5
P4
CT0I-CT3I
1
1
T2
RT2
1
4
CMSR0-CMSR5
CMT0, CMT1
RST
EW
0
1
2
ALTERNATE FUNCTION OF PORT 0
ALTERNATE FUNCTION OF PORT 1
ALTERNATE FUNCTION OF PORT 2
3
4
5
ALTERNATE FUNCTION OF PORT 3
ALTERNATE FUNCTION OF PORT 4
ALTERNATE FUNCTION OF PORT 5
SU01190
1999 Mar 30
3
Philips Semiconductors
Preliminary specification
80C51 8-bit microcontroller
8K/256 OTP, 8 channel 10 bit A/D, I
2
C, PWM,
capture/compare, high I/O, low voltage (2.7V–5.5V), low power
P87C552
PIN DESCRIPTION
PIN NO.
MNEMONIC
V
DD
STADC
PWM0
PWM1
EW
P0.0-P0.7
PLCC
2
3
4
5
6
57-50
QFP
72
74
75
76
77
58-51
TYPE
I
I
O
O
I
I/O
NAME AND FUNCTION
Digital Power Supply:
Positive voltage power supply pin during normal operation, idle and
power-down mode.
Start ADC Operation:
Input starting analog to digital conversion (ADC operation can also
be started by software).
Pulse Width Modulation:
Output 0.
Pulse Width Modulation:
Output 1.
Enable Watchdog Timer:
Enable for T3 watchdog timer and disable power-down mode.
Port 0:
Port 0 is an 8-bit open-drain bidirectional I/O port. Port 0 pins that have 1s written
to them float and can be used as high-impedance inputs. Port 0 is also the multiplexed
low-order address and data bus during accesses to external program and data memory. In
this application it uses strong internal pull-ups when emitting 1s. Port 0 is also used to input
the code byte during programming and to output the code byte during verification.
Port 1:
8-bit I/O port. Alternate functions include:
(P1.0-P1.5):
Programmable I/O port pins.
(P1.6, P1.7):
Open drain port pins.
CT0I-CT3I (P1.0-P1.3):
Capture timer input signals for timer T2.
T2 (P1.4):
T2 event input.
RT2 (P1.5):
T2 timer reset signal. Rising edge triggered.
SCL (P1.6):
Serial port clock line I
2
C-bus.
SDA (P1.7):
Serial port data line I
2
C-bus.
Port 1 has four modes selected on a per bit basis by writing to the P1M1 and P1M2
registers as follows:
P1M1.x
P1M2.x
Mode Description
0
0
Pseudo–bidirectional (standard c51 configuration; default)
0
1
Push-Pull
1
0
High impedance
1
1
Open drain
Port 1 is also used to input the lower order address byte during EPROM programming and
verification. A0 is on P1.0, etc.
P2.0-P2.7
39-46
38-42,
45-47
I/O
Port 2:
8-bit programmable I/O port.
Alternate function: High-order address byte for external memory (A08-A15). Port 2 is also
used to input the upper order address during EPROM programming and verification. A8 is
on P2.0, A9 on P2.1, through A12 on P2.4.
Port 2 has four output modes selected on a per bit basis by writing to the P2M1 and P2M2
registers as follows:
P2M1.x
P2M2.x
Mode Description
0
0
Pseudo–bidirectional (standard c51 configuration; default)
0
1
Push-Pull
1
0
High impedance
1
1
Open drain
Port 3:
8-bit programmable I/O port. Alternate functions include:
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.
Port 3 has four modes selected on a per bit basis by writing to the P3M1 and P3M2
registers as follows:
P3M1.x
0
0
1
1
P3M2.x
0
1
0
1
Mode Description
Pseudo–bidirectional (standard c51 configuration; default)
Push–Pull
High impedance
Open drain
P1.0-P1.7
16-23
16-21
22-23
16-19
20
21
22
23
10-17
10-15
16-17
10-13
14
15
16
17
I/O
I/O
I/O
I
I
I
I/O
I/O
P3.0-P3.7
24-31
24
25
26
27
28
29
30
31
18-20,
23-27
18
19
20
23
24
25
26
27
I/O
1999 Mar 30
5
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