AT89S852-12PC データシートの表示（PDF） - Atmel Corporation

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AT89S852-12PC

8 bit Microcontroller with 8K bytes Flash

Atmel Corporation 

Pin Configurations

PDIP

PLCC

PQFP/TQFP

Pin Description

VCC

Supply voltage.

GND

Ground.

Port 0

Port 0 is an 8 bit open drain bidirectional I/O port. As an

output port, each pin can sink eight TTL inputs. When 1s

are written to port 0 pins, the pins can be used as high-im-

pedance inputs.

Port 0 can also be configured to be the multiplexed low-or-

der address/data bus during accesses to external pro-

gram and data memory. In this mode, P0 has internal pul-

lups.

Port 0 also receives the code bytes during Flash program-

ming and outputs the code bytes during program verifica-

2

AT89S8252

tion. External pullups are required during program verifica-

tion.

Port 1

Port 1 is an 8 bit bidirectional I/O port with internal pullups.

The Port 1 output buffers can sink/source four TTL inputs.

When 1s are written to Port 1 pins, they are pulled high by

the internal pullups and can be used as inputs. As inputs,

Port 1 pins that are externally being pulled low will source

current (IIL) because of the internal pullups.

Some Port 1 pins provide additional functions. P1.0 and

P1.1 can be configured to be the timer/counter 2 external

count input (P1.0/T2) and the timer/counter 2 trigger input

(P1.1/T2EX), respectively.

(continued)

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