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PCF84C85AT

Microcontroller with extended I/O

Philips Electronics 

Philips Semiconductors

Microcontroller with extended I/O

Product specification

PCF84C85A

5 PINNING INFORMATION

5.1 Pinning

handbook, halfpage

INT / T0 1

40 V DD

P0.0 2

P0.1 3

39 T1

38 SCLK

P0.2 4

37 SDA / P2.3

P0.3 5

36 DP1.6

P0.4 6

35 DP1.5

P0.5 7

34 DP1.4

P0.6 8

33 DP1.3

P0.7 9

32 DP1.2

P1.0 10

31 DP1.1

PCF84C85A

P1.1 11

30 DP1.0

P1.2 12

29 DP0.7

P1.3 13

28 DP0.6

P1.4 14

27 DP0.5

P1.5 15

26 DP0.4

P1.6 16

25 DP0.3

P1.7 17

24 DP0.2

XTAL1 18

23 DP0.1

XTAL2 19

VSS 20

22 DP0.0

21 RESET

MLA597

Fig.2 Pin configuration.

5.2 Pin description

Table 1 DIP40 and VSO40 packages.

SYMBOL

INT/T0

P0.0 to P0.7

P1.0 to P1.7

XTAL1

XTAL2

VSS

RESET

DP0.0 to

DP0.7

DP1.0 to

DP1.6

SDA/P2.3

SCLK

T1

VDD

PIN TYPE DESCRIPTION

1

I Interrupt/Test 0

2 to 9

I/O 8 bits of Port 0: 8-bit

quasi-bidirectional

I/O port

10 to 17 I/O 8 bits of Port 1: 8-bit

quasi-bidirectional

I/O port

18

I XTAL input: crystal

oscillator/external

clock input

19

O XTAL output: crystal

oscillator output

20

P ground

21

I Reset input

22 to 29 I/O Derivative Port 0:

quasi-bidirectional

I/O port (8-bit)

30 to 36 I/O Derivative Port 1:

quasi-bidirectional

I/O lines (7-bit)

37

I/O bidirectional data line

of the I2C-bus

interface; or Port 2

quasi-bidirectional

I/O port (1 bit only)

38

I/O bidirectional clock

line of the I2C-bus

interface

39

I Test 1: count input of

8-bit timer/event

counter 1

40

P positive supply

6 PARALLEL PORTS

Of the standard quasi-bidirectional I/O ports, Port 2 is

incomplete, providing only line SDA/P2.3 that is shared

with the I2C-bus interface. In addition to the standard ports,

two derivative I/O ports are available:

• Derivative Port of 8 lines (DP0.0 to DP0.7)

• Derivative Port of 7 lines (DP1.0 to DP1.6).

Missing bits of incomplete ports, i.e. P2.0 to P2.2 and

DP1.7, are fixed at zero in the corresponding registers.

7 INSTRUCTION SET

See “PCF84CXXXA family” data sheet for a complete

description of the instruction set.

1996 Nov 21

5

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