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PCA84C822A

8-bit microcontrollers for remote control transmitters

Philips Electronics 

Philips Semiconductors

8-bit microcontrollers for

remote control transmitters

Product specification

PCA84C122; 222; 422; 622; 822

8.1.1 ON-TIME REGISTER (ADDRESS: 00H)

This 8-bit register is loaded by software; the decimal value

of its contents + 2, determine the number of oscillator

cycles that the OUT pin is active.

The active period (ON-time) of OUT = -(---c---o---n----t-fe--o--n-s--t-c-s----+-----2----)-

8.1.2 OFF-TIME REGISTER (ADDRESS: 01H)

This 8-bit register is loaded by software; the decimal value

of its contents + 2, determine the number of oscillator

cycles that the OUT pin is inactive.

The inactive period (OFF-time) of OUT = --(--c---o---n----t-fe--o--n-s--t-c-s----+-----2----)-

8.1.3 PULSE COUNTER

The Pulse Counter, is a 10-bit register consisting of:

• Pulse Counter Low (8-bit); address 02H.

• Pulse Counter High (2-bit); address 04H.

The Pulse Counter is loaded by software with the number

of pulses required in a pulse burst; loading ‘0’ is not

allowed.

8.1.4 CONTROL REGISTER (ADDRESS 03H)

The Control Register contains the bits that control various

possibilities for the output pulses, plus the reset of the

interrupt flip-flop and the Watchdog timer.

Table 2 Control Register (CR)

7

6

5

4

3

2

1

0

−

−

−

RWDT

Rint

PWM

LgP

HF

Table 3 Description of the CR bits

BIT

7 to 5

4

3

2

1

0

SYMBOL

DESCRIPTION

−

Reserved.

RWDT

Reload Watchdog Timer: This is not an actual flip-flop in the Control Register. If a logic 1 is

written to this bit position the Watchdog Timer is reloaded (reset to 0); this bit is Write only.

Rint

Reset Interrupt: This is not an actual flip-flop in the Control Register. If a logic 1 is written to this

bit position the interrupt flip-flop is reset; this bit is Write only.

PWM

Pulse Width Modulation: Is the standard term for a quasi analog signal. It is a square wave

signal of which the duty cycle may be varied. When integrated a real analog signal may be

obtained. When PWM = 1; the Pulse Counter Register is ignored and a continuous pulse train is

generated (see Fig.9); this bit is Read or Write.

LgP

Long Pulse: When LgP = 1; the OFF-time Register is ignored and a single pulse of length

= (ON-time) × (number of pulses) is generated. If HF = 1, this pulse is modulated with a

frequency 1⁄4 × fosc (see Fig.10); this bit is Read or Write.

HF

High Frequency: When HF = 1 the ON-time part of the generated pulse is modulated with a

frequency 1⁄4 × fosc (see Fig.11); this bit is Read or Write.

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

INSTRUCTION

DESCRIPTION

MOV Dx,A

Move contents of the accumulator to the derivative register.

MOV A,Dx

Move contents of derivative register to the accumulator.

ANL Dx,A

AND derivative register contents with contents of accumulator. Result is stored in derivative register.

ORL Dx,A

OR derivative register contents with contents of accumulator. Result is stored in derivative register.

1995 May 01

9

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