PCF84C21AP datasheet(5/20 Pages) PHILIPS

Part #	PCF84C21AP

Description	Telecom microcontrollers

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Manufacturer	PHILIPS [NXP Semiconductors]

Direct Link	http://www.nxp.com

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5 / 20 page

1996 Nov 20

5

Philips Semiconductors

Product speciﬁcation

Telecom microcontrollers

PCF84C21A; PCF84C41A;

PCF84C81A

5

PINNING INFORMATION

5.1

Pinning

Fig.2 Pin configuration.

1

2

3

4

5

6

7

8

9

10

11

12

13

28

27

26

25

24

23

22

21

20

19

18

17

16

15

14

PCF84C21A

PCF84C41A

PCF84C81A

P2.2

SDA/P2.3

SCLK

P0.0

P0.1

P0.2

P0.3

P0.4

P0.5

P0.6

P0.7

T1

VSS

INT/T0

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

MBB562

5.2

Pin description

Table 1

DIP28 and SO28 packages

SYMBOL

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

I2C-bus interface, or 1 bit of

Port 2: 4-bit quasi-bidirectional

I/O port

SCLK

3

bidirectional clock line of the

I2C-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

VSS

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

VDD

28

positive supply

6

INSTRUCTION SET

ROM is restricted to 2 kbytes for the PCF84C21A and

4 kbytes for the PCF84C41A. Therefore, the instructions

SEL MB1/2/3 for the PCF84C21A, and the instructions

SEL MB2/3 for the PCF84C41A should be avoided, as

they would define non-existing program memory banks.

As RAM is limited to 64 bytes for the PCF84C21A and to

128 bytes for the PCF84C41A, care should be taken to

avoid accesses to non-existing RAM locations.

See the “

PCF84CxxxA family” data sheet for a complete

description of the instruction set.

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.

Similar Part No. - PCF84C21AP

Manufacturer	Part #	Datasheet	Description
NXP Semiconductors	PCF84C22A	127Kb / 16P	8-bit microcontrollers 1996 Nov 20
	PCF84C22AP	127Kb / 16P	8-bit microcontrollers 1996 Nov 20
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PCF84C21AP Datasheet(PDF) 5 Page - NXP Semiconductors

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