A8032 Series

PRELIMINARY

3

AMIC Technology, Inc.

Pin Description

Pin No.

Symbol

I/O

Description

I/O

Port1. Port1 is a bidirectional I/O port with internal pull-ups. Pin

P1.0 and P1.1 also provide alternate functions as follows:

I/O

P1.0

T2

Timer/Counter2 external input/clock out

1 - 8

P1.0 - P1.7

I

P1.1

T2EX

Timer/Counter2 capture/reload input

9

RST

I

Reset input, active high. It must be kept high for at least two

machine cycles to be recognized by the processor

10 - 17

P3.0 - P3.7

I/O

Port3. Port3 is a bidirectional I/O port with internal pull-ups. Port3

pins also serve alternate functions as follows:

I

P3.0

RXD

Serial receive port

O

P3.1

TXD

Serial transmit port

I

P3.2

INT0

External interrupt 0

I

P3.3

INT1

External interrupt 1

I

P3.4

T0

Timer/Counter 0 input

I

P3.5

T1

Timer/Counter 1 input

O

P3.6

WR

External data memory write strobe

O

P3.7

RD

External data memory read strobe

18

XTAL2

O

Crystal2. This is the output of crystal oscillator. It is the inversion

of XTAL1

19

XTAL1

I

Crystal1. This is the input of crystal oscillator. It can be driven by

an external clock

20

GND

I

Ground

21 - 28

P2.0 - P2.7

I/O

Port2. Port2 is a bidirectional I/O port with internal pull-ups. Port2

is also the multiplexed upper-order address bus during accesses

to external data memory

29

PSEN

O

Program Store Enable, active low. The read strobe to external

when fetching external program memory

30

ALE

O

Address latch enable, active high. ALE is used to enable the

address latch that separates the data on Port 0

31

EA

I

External Access enable, active low. It is held low to enable the

device to fetch code from external program memory

32 - 39

P0.7 - P0.0

I/O

Port0. Port0 is an open drain, bidirectional I/O port. Port0 is also

the multiplexed low-order address bus during accesses to external

data memory

40

VCC

I

Power supply