Philips pcf84c12a DATASHEETS

INTEGRATED CIRCUITS

DATA SH EET

PCF84C12A

8-bit microcontroller

Product specification
Supersedes data of 1996 Nov 20
File under Integrated Circuits, IC14

1998 May 11

Philips Semiconductors Product specification

8-bit microcontroller PCF84C12A

CONTENTS

1 FEATURES
2 GENERAL DESCRIPTION
3 ORDERING INFORMATION (see note 1)
4 BLOCK DIAGRAM
5 PINNING INFORMATION

5.1 Pinning

5.2 Pin description
6 INSTRUCTION SET
7 ROM MASK OPTIONS
8 HANDLING
9 LIMITING VALUES
10 DC CHARACTERISTICS
11 AC CHARACTERISTICS
12 PACKAGE OUTLINES
13 SOLDERING

13.1 Introduction

13.2 DIP

13.3 SO
14 DEFINITIONS
15 LIFE SUPPORT APPLICATIONS

1998 May 11 2

Philips Semiconductors Product specification

8-bit microcontroller PCF84C12A

1 FEATURES

• Manufactured in silicon gate CMOS process

• 8-bit CPU, ROM, RAM, I/O in a 20-lead package

• 1 kbyte ROM

• 64 byte RAM

• Over 100 instructions (based on MAB8048) all of

1 or 2 cycles

• 13 quasi-bidirectional I/O port lines

• 8-bit programmable timer/event counter 1

• Two single-level vectored interrupts:

– external
– 8-bit programmable timer/event counter 1

• Two test inputs, one of which also serves as the external
interrupt input

• Stop and Idle modes

• Supply voltage: 2.5 to 5.5 V

• Clock frequency: 1 to 16 MHz

• Operating temperature: −40 to +85 °C.

3 ORDERING INFORMATION

2 GENERAL DESCRIPTION

This data sheet details the specific properties of the
PCF84C12A. The shared properties of the PCF84CxxxA
family of microcontrollers are described in the

“PCF84CxxxA family”

conjunction with this publication. Note that the devices
described in this data sheet do not feature I2C-bus
compatibility or derivative logic, so the information given in
the family data sheet about these features can be ignored.

The PCF84C12A is a general purpose CMOS
microcontroller with 1 kbyte of program memory.
It includes 64 bytes of RAM and 13 I/O port lines.
The instruction set is based on the MAB8048 and is a
sub-set of that listed in the
sheet.

data sheet, which should be read in

“PCF84CxxxA family”

data

TYPE NUMBER

PCF84C12AP DIP20 plastic dual in-line package; 20 leads (300 mil) SOT146-1
PCF84C12AT SO20 plastic small outline package; 20 leads; body width 7.5 mm SOT163-1

Note

1. Please refer to the Order Entry Form (OEF) for these devices for the full type number to use when ordering. This type

number will also specify the required program and ROM mask options.

(1)

NAME DESCRIPTION VERSION

PACKAGE

1998 May 11 3

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1998 May 11 4

4 BLOCK DIAGRAM

8-bit microcontroller PCF84C12A

Philips Semiconductors Product specification

INTERRUPT

LOGIC

INTERNAL

CLOCK

FREQ.

30

32

8

ACCUMULATOR

timer interrupt

external interrupt

COUNTER

STOP
IDLE

TIMER/
EVENT

INTERRUPT

TEST 1

TEMPORARY

REGISTER 1

P1.0 to P1.4

PORT 1

BUFFER

PORT 1

FLIP-FLOPS

5

888 8 8

TEMPORARY

REGISTER 2

CONTROL & TIMING

INITIALIZE

3

ARITHMETIC

LOGIC UNIT

DECIMAL

ADJUST

XTAL 2XTAL 1RESETINT / T0

OSCILLATOR

MEMORY

BANK

FLIP-FLOPS

(8)

RESIDENT ROM

1 kbyte

(PCF84C12A)

2 kbytes

(PCF84C22A)

4 kbytes

(PCF84C42A)

DECODE

HIGHER

PROGRAM

COUNTER

5 888 8

INSTRUCTION

REGISTER

&

DECODER

LOWER

PROGRAM

COUNTER

CONDITIONAL

BRANCH

LOGIC

PROGRAM

STATUS

WORD

RAM

ADDRESS

REGISTER

INT / T0
TEST 1

TIMER

FLAG

CARRY
ACC

ACC BIT

TEST

PORT 0

FLIP-FLOPS

D
E
C
O
D
E

RESIDENT RAM ARRAY

P0.7 to P0.0

PORT 0

BUFFER

MULTIPLEXER

REGISTER 0
REGISTER 1
REGISTER 2
REGISTER 3
REGISTER 4
REGISTER 5
REGISTER 6
REGISTER 7

8 LEVEL STACK

(VARIABLE LENGTH)

OPTIONAL SECOND

REGISTER BANK

DATA STORE

64 bytes

MBC951

Fig.1 Block diagram of PCF84C12A.

handbook, full pagewidth

Philips Semiconductors Product specification

8-bit microcontroller PCF84C12A

5 PINNING INFORMATION

5.1 Pinning

handbook, halfpage

P0.0
P0.1
P0.2
P0.3
P0.4
P0.5
P0.6
P0.7

INT/T0

V

SS

1
2
3
4
5

PCF84C12A

6
7
8
9

10

Fig.2 Pin configuration.

MBK778

20
19
18
17
16
15
14
13
12
11

V

DD
P1.4
P1.3
P1.2
P1.1
P1.0
RESET
XTAL2
XTAL1
T1

5.2 Pin description Table 1 DIP20 and SO20 packages

SYMBOL PIN TYPE DESCRIPTION

P0.0 to P0.7 1 to 8 I/O Port 0: 8-bit

quasi-bidirectional

I/O port
INT/T0 9 I Interrupt/Test 0
V

SS

10 P ground

T1 11 I Test 1/count input of

8-bit timer/event

counter 1
XTAL1 12 I crystal oscillator

input or external

clock input
XTAL2 13 O crystal oscillator

output
RESET 14 I reset input
P1.0 to P1.4 15 to 19 I/O Port 1: 4-bit

quasi-bidirectional

I/O port
V

DD

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.
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.

1998 May 11 5