Philips PCA84C122 Service manual

INTEGRATED CIRCUITS

DATA SH EET

PCA84C122; 222; 422; 622; 822

8-bit microcontrollers for
remote control transmitters

Product specification
Supersedes data of February 1994
File under Integrated Circuits, IC14

Philips Semiconductors

1995 May 01

Philips Semiconductors Product specification

8-bit microcontrollers for
remote control transmitters

CONTENTS

1 FEATURES
2 GENERAL DESCRIPTION

2.1 Important note
3 MEMORY AND I/O CONFIGURATIONS
4 ORDERING INFORMATION
5 BLOCK DIAGRAM
6 PINNING INFORMATION

6.1 Pinning

6.2 Pin description
7 POWER-ON-RESET STATUS AND PORT

OPTIONS

8 HARDWARE MODULATOR

8.1 Interface between the 84CXXX core and
derivative logic

8.2 Instructions for data transfer between the
84CXXX core and derivative logic

8.3 Operation of the Hardware Modulator

9 INTERRUPTS

9.1 Internal timer/counter

9.2 External keypad wake-up and T0/INT pin

10 OUTPUT DRIVER
11 WATCHDOG TIMER (WDT)
12 LIMITING VALUES
13 DC CHARACTERISTICS
14 AC CHARACTERISTICS
15 APPLICATION INFORMATION
16 PACKAGE OUTLINES
17 SOLDERING

17.1 Plastic small outline packages

17.2 Plastic dual in-line packages

18 DEFINITIONS
19 LIFE SUPPORT APPLICATIONS

PCA84C122; 222; 422; 622; 822

1995 May 01 2

Philips Semiconductors Product specification

8-bit microcontrollers for
remote control transmitters

1 FEATURES

• 84CXXX CPU

• ROM, RAM and I/O configurations are device

dependent; see Chapter 3

• Two test inputs: T0 (ANDed with Port 1 input lines)

and T1

• 3 single-level vectored interrupt sources:

– external (T0/INT and Port 1, for keypad press

wake-up function)
– timer/counter (TI)
– hardware modulator interrupt

• 8-bit programmable timer/counter with 5-bit pre-scaler

• Power saving: Idle and Stop modes are provided

• Hardware Modulator providing pulse bursts, with:

– programmable duty factor for each pulse
– programmable number of pulses

• One output line from the Hardware Modulator to control
the driver transistor for the infrared LED (IR-LED).
Capable of sinking 27 mA at V

• Watchdog Timer to keep the transmitter from being
locked or malfunction

• Available packages: SO and DIP types (SO20, SO24,
SO28, SDIP24 and DIP20); see Chapter 4

• On-chip oscillator: 455 kHz to 6 MHz

• Single supply voltage: 2.0 V to 5.5 V

• Operating temperature: −20 to +50 °C.

2 GENERAL DESCRIPTION

The PCA84C122 is a stand-alone microcontroller
designed for use in remote control transmitters for a wide
range of applications.

The PCA84C122 provides a number of dedicated
hardware functions for remote controller applications.
These functions include the following additional blocks to
the 84CXXX core:

• Interrupt Gate

• Hardware Modulator

• Output Driver

• Watchdog Timer.

= 2.0 V, V

DD

OUT

= 1.0 V

PCA84C122; 222; 422; 622; 822

Although the PCA84C122 is specifically referred to
throughout this data sheet, the information applies to all
the devices. The differences between the PCA84C122
and the other devices are specified in Chapter 3.

Figure 2 shows the general block diagram of the device.
The 84CXXX core plus 8 kbytes ROM and 64 bytes RAM
has the same function as described in the PCF84CXXX
family description (see

When the transmitter is not in use the microcontroller is in
Stop mode and the oscillator is halted. The AND gate
connected to the Port 1 (P10 to P17) lines provides the
wake-up to end the Stop mode.

The Hardware Modulator produces pulse bursts according
to the required protocol. The ON-time and OFF-time of
each pulse (i.e. duty factor) and the number of pulses are
controlled by software.

The Watchdog Timer (WDT) will reset the PCA84C122
when it has not been reloaded (reset) in time, because the
program has run out of sequence (endless loop,
continuous Idle mode, etc.). During Stop mode the
oscillator is halted, therefore the Watchdog Timer is not
running.

Automatic system reset is generated by the WDT if the
timer is not reset before overflow from counting within
a certain period of time.

The Output Driver can handle sufficient current to drive a
single transistor, that provides the required current for the
IR-LED.

2.1 Important note

This data sheet details the specific properties of the
PCA84C122; PCA84C222; PCA84C422; PCA84C622
and PCA84C822. The shared characteristics of the family
of microcontrollers are described in the PCF84CXXXA
Family single-chip 8-bit Microcontroller of

IC14”

, which should be read in conjunction with this data

sheet.

“Data Handbook IC14”

).

“Data Handbook

1995 May 01 3

Philips Semiconductors Product specification

8-bit microcontrollers for
remote control transmitters

3 MEMORY AND I/O CONFIGURATIONS

DEVICE I/O LINES ROM RAM

PCA84C122A 16
PCA84C122B 12
PCA84C222A 16
PCA84C222B 12
PCA84C422A 16
PCA84C422B 12
PCA84C622A 16
PCA84C622B 12
PCA84C622C 20
PCA84C822A 16

PCA84C822C 20

Note

1. 4 I/O lines with 10 mA sink capability.

(1)

(1)

PCA84C122; 222; 422; 622; 822

1K

2K

4K

6K

8KPCA84C822B 12

32 bytes

64 bytes

4 ORDERING INFORMATION

TYPE NUMBER

(1)

PACKAGE

NAME DESCRIPTION VERSION

PCA84CX22AP SDIP24 plastic shrink dual in-line package; 24 leads (400 mil) SOT234-1
PCA84CX22AT SO24 plastic small outline package; 24 leads; body width 7.5 mm SOT137-1
PCA84CX22BP DIP20 plastic dual in-line package; 20 leads (300 mil) SOT146-1
PCA84CX22BT SO20 plastic small outline package; 20 leads; body width 7.5 mm SOT163-1
PCA84C622CT
PCA84C822CT

SO28

plastic small outline package; 28 leads; body width 7.5 mm;
low stand-off height

SOT136-1

Note

1. ‘X’ in the type number denotes the numbers: 1, 2, 4, 6 and 8.

technology:

PC = CMOS

temperature range:

A = 20 to 50 C

PC

o

84C122

A

P

package:

P = plastic DIL
T = plastic mini-pack (SO)

generic type number

MLA973 - 1

Fig.1 Numbering scheme.

1995 May 01 4

1995 May 01 5

5 BLOCK DIAGRAM

remote control transmitters

Philips Semiconductors Product specification

8-bit microcontrollers for

V

DD

RESET

P20
P21
P22
P23

T1

XTAL1

XTAL

XTAL2

f / 30

osc

WDT

ROM

8 kbytes

RAM

64 bytes

PCA84CXXX

OSCILLATOR

HARDWARE

MODULATOR

84CXXX

CORE

T0/INT

OUTPUT

DRIVER

V

SS

MCD248 - 2

P00

P01

P02

P03

P04

P05

P06

P07

P10

P11

P12

P13

P14

P15

P16

P17

T0/INT

OUT

PCA84C122; 222; 422; 622; 822

Fig.2 Block diagram.

handbook, full pagewidth

Philips Semiconductors Product specification

8-bit microcontrollers for
remote control transmitters

6 PINNING INFORMATION

6.1 Pinning

P14 P15

1
2

P01
P00

3

T0 / INT

RESET

4

T1

5
6

84CX22AP

V

DD

XTAL2
XTAL1

P04
P05
P16 P17

84CX22AT

7
8

9
10
11
12

MCD251 - 2

PCA84C122; 222; 422; 622; 822

1

24

P02

23

P03

22
21

OUT
V

20

SS

P10

19

P11

18

P12

17

P13

16

P07

15

P06

14
13

P22

2

P14

3

P01

4

P00

T0/INT

RESET

XTAL2
XTAL1

5
6

T1

7

84C622CT

V

DD

P04
P05
P16 P17
P20

84C822CT

8

9
10
11
12
13

MLA977 - 1

P23

28

P15

27

P02

26

P03

25
24

OUT
V

SS

23

P10

22

P11

21

P12

20

P13

19

P07

18

P06

17
16

P21

1514

Fig.3 Pin configurations PCA84CX22AP (SDIP24)

and PCA84CX22AT(SO24).

1

P01

2

P00

T1

V

DD
XTAL2
XTAL1

P04
P05

3
4
5

84CX22BT

6
7
8
9

10

T0 / INT OUT

RESET

19
18
17
16
15
14
13
12
11

MCD250 - 2

20

P02
P03

V

SS

P10
P11
P12
P13
P07
P06

Fig.4 Pin configuration PCA84CX22CT (SO28).

1

P10

V

SS

OUT

P03
P02
P01

P00

T0/INT

T1

RESET

2
3
4
5

84CX22BP

6
7
8
9

10

MLA975 - 2

20

P11

19

P12
P13

18
17

P07
P06

16

P05

15

P04

14

XTAL1

13

XTAL2

12

V

11

DD

Fig.5 Pin configuration PCA84CX22BT (SO20). Fig.6 Pin configuration PCA84CX22BP (DIP20).

1995 May 01 6

Philips Semiconductors Product specification

8-bit microcontrollers for

PCA84C122; 222; 422; 622; 822

remote control transmitters

6.2 Pin description Table 1 Pin description for PCA84CX22AP, PCA84CX22AT, PCA84CX22BP, PCA84CX22BT and PCA84CX22CT

PIN

SYMBOL

P00 to P07 3, 2, 23, 22,

P10 to P17 19, 18, 17, 16,

P20 to P23 − 14, 15, 1, 28 −−standard I/O Port lines, generally

INT4538test T0 and external interrupt input

T0/
T15649test T1 input
RESET 67510active HIGH reset;

SDIP24/SO24

(see Fig.3)

10, 11, 14, 15

1, 22, 12, 13

SO28

(see Fig.4)

4, 3, 26, 25,
11, 12, 17, 18

22, 21, 20,19,
2, 27, 13, 16

SO20

(see Fig.5)

2, 1, 20, 19, 9,
10, 11, 12

16, 15, 14, 13 1, 20,19, 18 standard I/O Port lines, generally

DIP20

(see Fig.6)

7, 6, 5, 4, 14,
15, 16, 17

standard I/O Port lines, generally
used for keypad scanning

used for keypad sensing

used for visible LED’s

normally connected to V
For further information see
PCF84CXXXA description in

“Data Handbook IC14”

XTAL1 9 10 8 13 crystal or ceramic resonator
XTAL289712
OUT 21 24 18 3 pulse train output pin, capable of

sinking 27 mA

V

DD

V

SS

78611power supply
20 23 17 2 ground

DESCRIPTION

.

SS

.

7 POWER-ON-RESET STATUS AND PORT OPTIONS

• All Port lines are standard I/O (option 1).

• RESET (Power-on-reset) level of 1.3 V.

After Power-on-reset, Port 0 is reset to LOW; Port 1, Port 2 and

1995 May 01 7

OUT are reset to HIGH.

Philips Semiconductors Product specification

8-bit microcontrollers for
remote control transmitters

8 HARDWARE MODULATOR

The Hardware Modulator is the main derivative part in the
PCA84C122. Figure 7 shows the internal architecture.

The Hardware Modulator generates a pulse train whereby
the ON-time of a pulse and the OFF-time between pulses
can be programmed in a number of clock cycles
(period = 1/f

); see Figs 8 and 7.

osc

internal bus (IB0 – 7)

ON-TIME

REGISTER

(8)

OFF-TIME

REGISTER

(8)

PCA84C122; 222; 422; 622; 822

The number of pulses of the train is also programmable.
The time between pulse bursts is determined by software,
possibly using the standard 8-bit Timer/Counter.

8.1 Interface between the 84CXXX core and derivative logic

There are three (derivative) registers and one (derivative)
counter that must be loaded from the core.

CONTROL

REGISTER

(5)

f

osc

control

OUT

start

ON-time

PULSE TIMER

(8)

CONTROL LOGIC

Fig.7 Hardware Modulator.

OFF-time

end

interrupt

pulse #1 pulse #2 pulse #3

PULSE COUNTER

HIGH

(2)

elapse time by software

PULSE COUNTER

LOW

(8)

OUT

MCD255 - 1

MCD254

OFF-time = 4 (off-time register = 2)ON-time = 2 (on-time register = 0) number of pulses = 3

Fig.8 Example pulse train output of OUT pin.

1995 May 01 8