20

µPD6P9

Data Sheet U15144EJ1V1DS

4.3.2 Carrier output control

Remote controller carrier can be output from the REM pin by clearing (0) bit 9 (CARY) of the modulo register

for setting the high-level period (MOD1).

When performing carrier output, be sure to set the timer operation after setting the MOD0 and MOD1 values.

Note that a malfunction may occur if the values of MOD0 and MOD1 are changed while carrier is being output from

the REM pin.

Executing the timer manipulation instruction starts the carrier output from the low level.

If the timer’s down counter reaches 0 during carrier output, carrier output is stopped and the REM pin becomes

low level. If the down counter reaches 0 while the carrier output is high level, carrier output will stop after first

becoming low level following the set period of high level.

Figure 4-4. Timer Output (When Carrier Is Output)

Notes 1. (Set value + 1)

× 64/fX (

µPD6P9M1), (set value + 0.5) × 64/fX (µPD6P9M3)

2. If the down counter reaches 0 while the carrier output is high level, carrier output will stop after

becoming low level.

LED

Note 2

Timer output timeNote 1

REM

tL

tH

Timer manipulation instruction