PCF84C42A Ver la hoja de datos (PDF) - Philips Electronics

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PCF84C42A

8-bit microcontrollers

Philips Electronics 

Philips Semiconductors

8-bit microcontrollers

Product specification

PCF84C12A; PCF84C22A;

PCF84C42A

5 PINNING INFORMATION

5.1 Pinning

P0.0 1

20 VDD

P0.1 2

19 P1.4

P0.2 3

18 P1.3

P0.3 4

17 P1.2

P0.4 5

P0.5 6

PCF84C12A 16 P1.1

PCF84C22A

PCF84C42A 15 P1.0

P0.6 7

14 RESET

P0.7 8

13 XTAL2

INT/T0 9

12 XTAL1

VSS 10

11 T1

MBC952

Fig.2 Pin configuration.

5.2 Pin description

Table 1 DIP20 and SO20 packages

SYMBOL

P0.0 to P0.7

INT/T0

VSS

T1

XTAL1

XTAL2

RESET

P1.0 to P1.4

VDD

PIN TYPE DESCRIPTION

1 to 8

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

quasi-bidirectional

I/O port

9

I Interrupt/Test 0

10

P ground

11

I Test 1/count input of

8-bit timer/event

counter 1

12

I crystal oscillator

input or external

clock input

13

O crystal oscillator

output

14

I Reset input

15 to 19 I/O 4 bits of Port 1: 4-bit

quasi-bidirectional

I/O port

20

P positive supply

6 INSTRUCTION SET

Since the I2C-bus interface, Port 2 and derivative logic are

not provided, instructions associated with these functions

are not available.

ROM space is restricted to 1 kbyte for the PCF84C12A,

2 kbytes for the PCF84C22A and 4 kbytes for the

PCF84C42A. Therefore, the instructions SEL MB1/2/3 for

the PCF84C12A and PCF84C22A, and the instructions

SEL MB2/3 for PCF84C42A should be avoided as they

would define non-existing program memory banks.

As RAM space is limited to 64 bytes, care should be taken

to avoid accesses to non-existing RAM locations.

Refer to the “PCF84CxxxA family” data sheet, for a

complete description of the instruction set.

1996 Nov 20

5

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