PCF84C12AP datasheet(5/16 Pages) PHILIPS

5 / 16 page

1998 May 11

Philips Semiconductors

Product speciﬁcation

8-bit microcontroller

PCF84C12A

PINNING INFORMATION

5.1

Pinning

Fig.2 Pin configuration.

handbook, halfpage

PCF84C12A

MBK778

P0.0

P0.1

P0.2

P0.3

P0.4

P0.5

P0.6

P0.7

INT/T0

VSS

XTAL1

XTAL2

RESET

P1.0

P1.1

P1.3

P1.2

P1.4

VDD

5.2

Pin description

Table 1

DIP20 and SO20 packages

SYMBOL

TYPE

DESCRIPTION

P0.0 to P0.7

1 to 8

I/O

Port 0: 8-bit

quasi-bidirectional

I/O port

INT/T0

Interrupt/Test 0

VSS

ground

Test 1/count input of

8-bit timer/event

counter 1

XTAL1

crystal oscillator

input or external

clock input

XTAL2

crystal oscillator

output

RESET

reset input

P1.0 to P1.4

15 to 19

I/O

Port 1: 4-bit

quasi-bidirectional

I/O port

VDD

positive supply

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.

Therefore, the instructions SEL MB1/2/3 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.

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