1996 Nov 25

5

Philips Semiconductors

Product specification

PCF84C00

MGG402

13

8

PSEN

D0-D7

A0-A12

Fig.2

Replacement of dotted section in Fig.1, for

the PCF84C00B ‘piggy-back’ version.

k, full pagewidth

13

8

PSEN

DXALE

DXRD

DXWR

EXDI

D0-D7

A0-A12

Fig.3

Replacement of dotted section in Fig.1, for

the PCF84C00T ROM-less version.

5

PINNING

Table 1

PCF84C00B (see Fig.4)

SYMBOL

PIN

TYPE

DESCRIPTION

P2.2

1

I/O

1 bit of Port 2: 4-bit quasi-bidirectional I/O port

SDA/P2.3

2

I/O

quasi-bidirectional I/O line

SCLK

3

I/O

P0.0 to P0.7

4 to 11

I/O

8 bits of Port 0: 8-bit quasi-bidirectional I/O port

INT/T0

12

I

Interrupt/Test 0: external interrupt input (negative edge triggered)/test input

pin. When used as a test input, this pin is directly tested by conditional branch

instructions JT0 and JNT0.

T1

13

I

Test 1: test input pin, directly tested by conditional branch instructions JT1 and

JNT1. T1 may also be selected as an input to the 8-bit timer/event counter via

the STRT CNT instruction.

14

P

ground: circuit earth potential

XTAL1

15

I

oscillator input: input from a crystal which determines the internal oscillator

frequency or an external clock generator

XTAL2

16

I/O

oscillator output: output of the inverting amplifier

RESET

17

I/O

reset input: used to initialize the microcontroller (active HIGH); also output of

power-on-reset circuit

P1.0 to P1.7

18 to 25

I/O

8 bits of Port 1: 8-bit quasi-bidirectional I/O port

P2.0 to P2.1

26, 27

I/O

2 bits of Port 2: 4-bit quasi-bidirectional I/O port

28

P

power supply: 2.5 V to 5.5 V