Philips pcf84c81a DATASHEETS

INTEGRATED CIRCUITS

DATA SH EET

PCF84C81A

Telecom microcontroller

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

1998 Apr 20

Philips Semiconductors Product specification

Telecom microcontroller PCF84C81A

CONTENTS

1 FEATURES
2 GENERAL DESCRIPTION
3 ORDERING INFORMATION
4 BLOCK DIAGRAM
5 PINNING INFORMATION

5.1 Pinning

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

14.1 Introduction

14.2 DIP

14.2.1 Soldering by dipping or by wave

14.2.2 Repairing soldered joints

14.3 SO

14.3.1 Reflow soldering

14.3.2 Wave soldering

14.3.3 Repairing soldered joints
15 DEFINITIONS
16 LIFE SUPPORT APPLICATIONS
17 PURCHASE OF PHILIPS I2C COMPONENTS

1998 Apr 20 2

Philips Semiconductors Product specification

Telecom microcontroller PCF84C81A

1 FEATURES

• Manufactured in silicon gate CMOS process

• 8-bit CPU, ROM, RAM, I/O in a 28-lead package

• 8 kbyte ROM, 256 byte RAM (PCF84C81A)

• I2C-bus interface with multi-master capability

• Over 100 instructions (based on MAB8048) all of

1 or 2 cycles

• 20 quasi-bidirectional I/O Port lines

• High sink current capability on the 8 lines of Port 1

• 8-bit programmable timer/event counter 1

• 3 single-level vectored interrupts:

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

2

C-bus

–I

• 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.

2 GENERAL DESCRIPTION

This data sheet details the specific properties of the
PCF84C81A. The shared properties of the PCF84CxxxA
family of microcontrollers are described in the

“PCF84CxxxA family”

conjunction with this publication.
The PCF84C81A is a general purpose CMOS

microcontroller with 8 kbytes of program memory and
256 bytes of RAM. In addition to 20 I/O port lines, the
microcontrollers provide an on-chip I2C-bus interface. This
two-line serial bus extends the microcontroller capabilities
when implemented with the powerful I
These include LCD drivers, I/O expanders, telecom
circuits, ADC and DAC converters, clock/calendar circuits,
EEPROM and RAM and are listed in

data sheet which should be read in

2

C-bus peripherals.

“Data Handbook

IC12, I2C Peripherals”.

The instruction set is based on that of the MAB8048 and
is a sub-set of that listed in the
sheet.

“PCF84CxxxA family”

data

3 ORDERING INFORMATION (see note 1)

TYPE NUMBER

NAME DESCRIPTION VERSION

PCF84C81AP DIP28 plastic dual in-line package; 28 leads (600 mil) SOT117-1
PCF84C81AT SO28 plastic small outline package; 28 leads; body width 7.5 mm SOT136-1

Note

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

specify the required program and the ROM mask options.

PACKAGE

1998 Apr 20 3

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1998 Apr 20 4

PORT 0

P0.0 to P0.7

8

PORT 0

BUFFER

CLOCK

SCLK

SDA/P2.3

DATA

PORT 2

FLIP-FLOPS

PORT 2

BUFFER

3

PORT 1

FLIP-FLOPS

P1.0 to P1.7P2.0 to P2.2

PORT 1

BUFFER

RESIDENT ROM

8

2 kbytes

(PCF84C21A)

4 kbytes

(PCF84C41A)

8 kbytes

(PCF84C81A)

DECODE

FLIP-FLOPS

4 BLOCK DIAGRAM

Telecom microcontroller PCF84C81A

Philips Semiconductors Product specification

INTERRUPT

SIO/

derivative

interrupt

I2C-BUS

INTERFACE

LOGIC

8

ACCUMULATOR

timer interrupt

external interrupt

INTERNAL

CLOCK

FREQ.

30

32

T1

4

8

TEMPORARY

REGISTER 2

STOP

IDLE

INTERRUPT INITIALIZE

8

8

TEMPORARY

REGISTER 1

CONTROL &

TIMING

ARITHMETIC

LOGIC UNIT

OSCILLATOR

DECIMAL

ADJUST

XTAL 2XTAL 1RESETINT / T0

MEMORY

BANK

FLIP-FLOPS

TIMER/
EVENT

COUNTER

HIGHER

PROGRAM

COUNTER

8

88 8

5888 8

INSTRUCTION

REGISTER

&

DECODER

LOWER

PROGRAM

COUNTER

CONDITIONAL

BRANCH

LOGIC

PROGRAM

STATUS

WORD

RAM

ADDRESS

REGISTER

INT / T0
T 1

TIMER

FLAG

CARRY
ACC

ACC BIT

TEST

8

MULTIPLEXER

REGISTER 0
REGISTER 1
REGISTER 2
REGISTER 3
REGISTER 4
REGISTER 5

D

REGISTER 6

E

REGISTER 7

C

8 LEVEL STACK

O

(VARIABLE LENGTH)

D
E

OPTIONAL SECOND

REGISTER BANK

DATA STORE

RESIDENT RAM ARRAY

MBB561

Fig.1 Block diagram of PCF84C21A; PCF84C41A and PCF84C81A.

Fig.1 Block diagram.

handbook, full pagewidth

Philips Semiconductors Product specification

Telecom microcontroller PCF84C81A

5 PINNING INFORMATION

5.1 Pinning

handbook, halfpage

SDA/P2.3

INT/T0

P2.2

SCLK

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

V

T1
SS

1
2
3
4
5
6
7

PCF84C81A

8

9
10
11
12
13

Fig.2 Pin configuration.

MBB562

28
27
26
25
24
23
22
21
20
19
18
17
16
1514

V

DD
P2.1
P2.0
P1.7
P1.6
P1.5

P1.4
P1.3

P1.2
P1.1
P1.0
RESET
XTAL2
XTAL1

5.2 Pin description Table 1 DIP28 and SO28 packages

SYMBOL PIN FUNCTION

P2.2 1 1 bit of Port 2: 4-bit

quasi-bidirectional I/O port

SDA/P2.3 2 bidirectional data line of the

2

I

C-bus interface, or 1 bit of
Port 2: 4-bit quasi-bidirectional
I/O port

SCLK 3 bidirectional clock line of the

2

I

C-bus interface

P0.0 to P0.7 4 to 11 8 bits of Port 0: 8-bit

quasi-bidirectional I/O port

INT/T0 12 Interrupt/Test 0
T1 13 Test 1/count input of 8-bit

timer/event counter 1

V

SS

14 ground

XTAL1 15 crystal oscillator input or

external clock input

XTAL2 16 crystal oscillator output
RESET 17 Reset input
P1.0 to P1.7 18 to 25 8 bits of Port 1: 8-bit

quasi-bidirectional I/O port

P2.0 to P2.1 26 to 27 2 bits of Port 2: 4-bit

quasi-bidirectional I/O port

V

DD

28 positive supply

6 INSTRUCTION SET

See the “

PCF84CxxxA family

” data sheet for a complete

description of the instruction set.

1998 Apr 20 5

7 HIGH SINK OUTPUT CURRENTS

The Port 1 outputs of these devices are designed for high
current drive in the logic 0 state. They are capable of
driving 10 mA loads and higher. Applications include drive
for small relays and light-emitting diodes (LEDs).

To avoid overload, care should be taken that the total
Port 1 current averages less than 80 mA, i.e. an average
of 10 mA per Port 1 line. Refer to Chapter “Limiting values”
which specifies an upper limit of 100 mA for ISS.

Philips Semiconductors Product specification

Telecom microcontroller PCF84C81A

8 ROM MASK OPTIONS

ROM CODE OPTION

Program/data

Port Output

P0.0 to P0.7 standard open-drain push-pull
P1.0 to P1.7 standard open-drain push-pull
P2.0 to P2.2 standard open-drain push-pull
SDA/P2.3 − open-drain −

Port State after reset

P0.0 to P0.7 set reset −
P1.0 to P1.7 set reset −
P2.0 to P2.2 set reset −
SDA/P2.3 set −−

Any mix of instructions and data up to ROM size of
8 kbytes.

Oscillator

Transconductance LOW (g

) MEDIUM (gmM) HIGH (gmH)

mL

9 HANDLING

Inputs and outputs are protected against electrostatic discharge in normal handling. However, it is good practice to take
normal precautions appropriate to handling MOS devices. See

“Data Handbook IC14, Section: Handling MOS devices”

10 LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 134).

SYMBOL PARAMETER MIN. MAX. UNIT

V

DD

V

I

I

I

I

O

I

O

P

tot

P

O

I

DD

I

SS

T

stg

T

j

supply voltage −0.5 +7 V
all input voltages −0.5 VDD+ 0.5 V
DC input current −10 +10 mA
DC output current except Port 1 output LOW −10 +10 mA
DC output current, Port 1 output LOW −10 +20 mA
total power dissipation − 125 mW
power dissipation per output − 30 mW
supply current −50 +50 mA
ground supply current −100 +50 mA
storage temperature range −55 +150 °C
operating junction temperature − 90 °C

.

1998 Apr 20 6