upd6p9 Renesas Electronics Corporation., upd6p9 Datasheet - Page 20

• Manufacturer Part Number: upd6p9
• Description: 4-bit Single-chip Microcontroller For Infrared Remote Control Transmission
• Manufacturer: Renesas Electronics Corporation.

4.3.2 Carrier output control
for setting the high-level period (MOD1).
Note that a malfunction may occur if the values of MOD0 and MOD1 are changed while carrier is being output from
the REM pin.
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.
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Remote controller carrier can be output from the REM pin by clearing (0) bit 9 (CARY) of the modulo register
When performing carrier output, be sure to set the timer operation after setting the MOD0 and MOD1 values.
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
Notes 1. (Set value + 1) × 64/f
2. If the down counter reaches 0 while the carrier output is high level, carrier output will stop after
becoming low level.
Timer manipulation instruction
REM
LED
Figure 4-4. Timer Output (When Carrier Is Output)
X
( µ PD6P9M1), (set value + 0.5) × 64/f
t
L
t
Data Sheet U15144EJ1V1DS
H
Timer output time
Note 1
X
Note 2
( µ PD6P9M3)
µ PD6P9