p80c528efp NXP Semiconductors, p80c528efp Datasheet - Page 11

• Manufacturer Part Number: p80c528efp
• Description: 8-bit Microcontrollers
• Manufacturer: NXP Semiconductors

Philips Semiconductors
7.2
Table 1 Pin description for P83C524, P80C528 and P83C528; see note 1
1997 Dec 15
P1.0 P1.7 1 to 8
T2
T2EX
SCL
SDA
RST
P3.0 P3.7 10 17
RXD/data
TXD/clock 11
INT0
INT1
T0
T1
WR
RD
XTAL2
SYMBOL
8-bit microcontrollers
Pin description
SOT 129-1 SOT 187-2 SOT 307-2
1
2
7
8
9
10
12
13
14
15
16
17
18
2 9
(1 n.c.)
2
3
8
9
10
11, 13 19
(12 n.c.)
11
13
14
15
16
17
18
19
20
PIN
1 3,
40 44
(39 n.c.)
40
41
2
3
4
5, 7 13
(6 n.c.)
5
7
8
9
10
11
12
13
14
Port 1: 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, except P1.6 and P1.7 which have open drain
outputs.
Port 1 alternative functions:
P1.0
P1.1
P1.6
P1.7
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 V
internal reset signal is active.
Port 3: 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:
P3.0
P3.1
P3.2
P3.3
P3.4
P3.5
P3.6
P3.7
The generation or use of a Port 3 pin as an alternative function is
carried out automatically by the P83C528 provided the associated
Special Function Register (SFR) bit is set HIGH.
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 Figures 22 and 23).
DD
. After a WDT overflow this pin is pulled HIGH while the
11
Timer/event counter 2 external event counter input
(falling edge triggered)
Timer/event counter 2 capture/reload trigger or external
interrupt 2 input (falling edge triggered)
I
I
Serial Port data input (asynchronous) or data
input/output (synchronous)
Serial Port data output (asynchronous) or clock output
(synchronous)
external interrupt 0 or gate control input for timer/event
counter 0
external interrupt 1 or gate control input for timer/event
counter 1
external input for timer/event counter 0
external input for timer/event counter 1
external data memory write strobe
external data memory read strobe.
2
2
C-bus Serial Port clock line
C-bus Serial Port data line.
P83C524; P80C528; P83C528
DESCRIPTION
Product specification