Philips PCA84C122AP-073, PCA84C122AT-073, PCA84C122AT-093 Datasheet

DATA SH EET

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

1995 May 01

INTEGRATED CIRCUITS

Philips Semiconductors

PCA84C122; 222; 422; 622; 822

8-bit microcontrollers for
remote control transmitters

1995 May 01 2

Philips Semiconductors Product specification

8-bit microcontrollers for
remote control transmitters

PCA84C122; 222; 422; 622; 822

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

1995 May 01 3

Philips Semiconductors Product specification

8-bit microcontrollers for
remote control transmitters

PCA84C122; 222; 422; 622; 822

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

DD

= 2.0 V, V

OUT

= 1.0 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.

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

“Data Handbook IC14”

).

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

“Data Handbook

IC14”

, which should be read in conjunction with this data

sheet.

1995 May 01 4

Philips Semiconductors Product specification

8-bit microcontrollers for
remote control transmitters

PCA84C122; 222; 422; 622; 822

3 MEMORY AND I/O CONFIGURATIONS

Note

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

4 ORDERING INFORMATION

Note

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

DEVICE I/O LINES ROM RAM

PCA84C122A 16

1K

32 bytes

PCA84C122B 12
PCA84C222A 16

2K

PCA84C222B 12
PCA84C422A 16

4K

PCA84C422B 12
PCA84C622A 16

6K

64 bytes

PCA84C622B 12
PCA84C622C 20

(1)

PCA84C822A 16

8KPCA84C822B 12

PCA84C822C 20

(1)

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

SO28

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

SOT136-1

PCA84C822CT

Fig.1 Numbering scheme.

PC

A

84C122

P

MLA973 - 1

technology:

PC = CMOS

temperature range:

A = 20 to 50 C

package:

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

generic type number

o

1995 May 01 5

Philips Semiconductors Product specification

8-bit microcontrollers for

remote control transmitters

PCA84C122; 222; 422; 622; 822

5 BLOCK DIAGRAM

handbook, full pagewidth

MCD248 - 2

P01

P00

P03

P02

P05

P04

P07

P06

P11

P10

P13

P12

P15

P14

P17

P16

WDT

V

SS

P20
P21
P22
P23

T1

RESET

84CXXX

CORE

PCA84CXXX

T0/INT

ROM

8 kbytes

RAM

64 bytes

f / 30

V

DD

OSCILLATOR

HARDWARE

MODULATOR

OUTPUT

DRIVER

XTAL

XTAL1

XTAL2

OUT

T0/INT

osc

Fig.2 Block diagram.

1995 May 01 6

Philips Semiconductors Product specification

8-bit microcontrollers for
remote control transmitters

PCA84C122; 222; 422; 622; 822

6 PINNING INFORMATION

6.1 Pinning

1
2
3
4
5
6
7
8

9
10
11
12

24
23
22
21
20
19
18
17
16
15
14
13

MCD251 - 2

84CX22AP
84CX22AT

P01
P00

T1

RESET

V

DD

XTAL2
XTAL1

P04
P05

P02
P03

V

SS

P10
P11
P12
P13
P07
P06

P16 P17

P14 P15

T0 / INT

OUT

Fig.3 Pin configurations PCA84CX22AP (SDIP24)

and PCA84CX22AT(SO24).

Fig.4 Pin configuration PCA84CX22CT (SO28).

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
1514

P14
P01
P00

T1

RESET

V

DD
XTAL2
XTAL1

P04
P05
P16 P17

P06

P07

P13

P12

P11

P10

V

SS

P03

P02

P15

P22

P23

P20

P21

84C622CT
84C822CT

MLA977 - 1

T0/INT

OUT

1

2
3
4
5
6
7
8
9

10

20
19
18
17
16
15
14
13
12
11

P01
P00

T1

RESET

V

DD
XTAL2
XTAL1

P04
P05

P02
P03

V

SS

P10
P11
P12
P13
P07
P06

MCD250 - 2

T0 / INT OUT

84CX22BT

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

1
2
3
4
5
6
7
8
9

10

20
19
18
17
16
15
14
13
12
11

84CX22BP

MLA975 - 2

P10

P03
P02
P01

P00

T0/INT

T1

RESET

XTAL2

XTAL1

P04

P05

P06

P07

P12

P11

OUT

P13

V

DD

V

SS

1995 May 01 7

Philips Semiconductors Product specification

8-bit microcontrollers for
remote control transmitters

PCA84C122; 222; 422; 622; 822

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

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

OUT are reset to HIGH.

SYMBOL

PIN

DESCRIPTION

SDIP24/SO24

(see Fig.3)

SO28

(see Fig.4)

SO20

(see Fig.5)

DIP20

(see Fig.6)

P00 to P07 3, 2, 23, 22,

10, 11, 14, 15

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

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

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

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

P10 to P17 19, 18, 17, 16,

1, 22, 12, 13

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

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

used for keypad sensing

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

used for visible LED’s

T0/

INT4538test T0 and external interrupt input
T15649test T1 input
RESET 67510active HIGH reset;

normally connected to V

SS

.
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

78611power supply

V

SS

20 23 17 2 ground

1995 May 01 8

Philips Semiconductors Product specification

8-bit microcontrollers for
remote control transmitters

PCA84C122; 222; 422; 622; 822

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

osc

); see Figs 8 and 7.

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.

Fig.7 Hardware Modulator.

MCD255 - 1

internal bus (IB0 – 7)

CONTROL LOGIC

control

PULSE COUNTER

HIGH

(2)

PULSE TIMER

PULSE COUNTER

LOW

(8)

OFF-TIME

REGISTER

(8)

ON-TIME

REGISTER

(8)

CONTROL

REGISTER

(5)

f

osc

OUT

(8)

Fig.8 Example pulse train output of OUT pin.

OFF-time

ON-time

pulse #1 pulse #2 pulse #3

interrupt

end

elapse time by software

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

start

MCD254

OUT