P89C738ABB View Datasheet(PDF) - Philips Electronics
Part Name
Description
Manufacturer
P89C738ABB Datasheet PDF : 64 Pages
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Table 1 Pin description for DIP40; QFP44; PLC44; QFP64 and PLCC68.
SYMBOL
P1.0/T2
P1.1/T2EX
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
RST
PLCC68 QFP64
19
11
21
13
22
14
23
15
25
17
27
19
28
20
29
21
30
22
PIN(1)
PLCC44 QFP44
16
2
15
3
14
4
13
5
12
6
1
7
2
8
3
9
4
10
DIP40
1
2
3
4
5
6
7
8
9
P3.0/RXD/data 34
26
5
11
10
P3.1/TXD/clock 39
29
7
13
11
P3.2/INT0
40
30
8
14
12
P3.3/INT1
41
31
9
15
13
P3.4/T0
42
32
10
16
14
P3.5/T1
43
33
11
17
15
P3.6WR
45
35
44
18
16
P3.7/RD
47
37
43
19
17
XTAL2
XTAL1
48
38
42
20
18
49
39
41
21
19
VSS
51
41
40
22
20
DESCRIPTION
Port 1: P1.0 to P1.7; 8-bit quasi-bidirectional I/O port. Port 1 can
sink/source one TTL (= 4 LSTTL) input. It can drive CMOS inputs
without external pull-ups.
Port 1 alternative functions are: T2; Timer/event counter 2 external
event counter input (falling edge triggered). T2EX; Timer/event
counter 2 capture/reload trigger or external interrupt 2 input (falling
edge triggered).
Reset; a HIGH level on this pin for two machine cycles while the
oscillator is running, resets the device. An internal pull-down resistor
permits power-on reset using only a capacitor connected to VDD.
After a Watchdog Timer overflow this pin is pulled HIGH while the
internal reset signal is active.
Port 3: P3.0 to P3.7; 8-bit quasi-bidirectional I/O Port with internal
pull-ups. Port 3 can sink/source one TTL (= 4 LSTTL) input. It can
drive CMOS inputs without external pull-ups.
Port 3 alternative functions are: RXD/data; Serial Port data input
(asynchronous) or data input/output (synchronous).
TXD/clock; Serial Port data output (asynchronous) or clock output
(synchronous). INT0; External interrupt 0 or gate control input for
Timer/event counter 0. INT1; External interrupt 1 or gate control
input for Timer/event counter 1. T0; external input for Timer/event
counter 0. T1; external input for Timer/event counter 1.
WR; external data memory write strobe. RD; external data memory
read strobe.
Crystal input 2: output of the inverting amplifier that forms the
oscillator. This pin left open-circuit when an external oscillator clock
is used (see Figs 18 and 20).
Crystal input 1: input to the inverting amplifier that forms the
oscillator, and input to the internal clock generator. Receives the
external oscillator clock signal when an external oscillator is used
(see Figs 18 and 20).
Ground: circuit ground potential.
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