Philips Semiconductors
Product data
Single-chip 8-bit microcontroller with 10-bit A/D,
capture/compare timer, high-speed outputs, PWM
80C552/83C552
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:
+5 V 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). This pin must not float.
Pulse Width Modulation:
Output 0.
Pulse Width Modulation:
Output 1.
Enable Watchdog Timer:
Enable for T3 watchdog timer and disable power-down mode.
This pin must not float.
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 1:
8-bit I/O port. Alternate functions include:
(P1.0-P1.5):
Quasi-bidirectional 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 is also used to input the lower order address byte during EPROM programming and
verification. A0 is on P1.0, etc.
Port 2:
8-bit quasi-bidirectional I/O port.
Alternate function: High-order address byte for external memory (A08-A15).
Port 3:
8-bit quasi-bidirectional 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.
I/O
O
O
I
I/O
I
Port 4:
8-bit quasi-bidirectional I/O port. Alternate functions include:
CMSR0-CMSR5 (P4.0-P4.5):
Timer T2 compare and set/reset outputs on a match with
timer T2.
CMT0, CMT1 (P4.6, P4.7):
Timer T2 compare and toggle outputs on a match with timer T2.
Port 5:
8-bit input port.
ADC0-ADC7 (P5.0-P5.7):
Alternate function: Eight input channels to ADC.
Reset:
Input to reset the 8XC552. It also provides a reset pulse as output when timer T3
overflows.
Crystal Input 1:
Input to the inverting amplifier that forms the oscillator, and input to the
internal clock generator. Receives the external clock signal when an external oscillator is
used.
Crystal Input 2:
Output of the inverting amplifier that forms the oscillator. Left open-circuit
when an external clock is used.
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
P2.0-P2.7
P3.0-P3.7
39-46
24-31
24
25
26
27
28
29
30
31
38-42,
45-47
18-20,
23-27
18
19
20
23
24
25
26
27
80, 1-2
4-8
80, 1-2
4-6
7, 8
71-64,
9
32
I/O
I/O
P4.0-P4.7
7-14
7-12
13, 14
P5.0-P5.7
RST
XTAL1
68-62,
1
15
35
XTAL2
34
31
O
2002 Sep 03
7
PHILIPS [ NXP SEMICONDUCTORS ]
