PD62A_15 Datasheet, PDF (21/64 Pages) Renesas Technology Corp – 4-BIT SINGLE-CHIP MICROCONTROLLER FOR INFRARED REMOTE CONTROL TRANSMISSION

µPD62A
4. TIMER
4.1 Timer Configuration
The timer is the block used for creating a remote control transmission pattern. As shown in Figure 4-1, it consists
of a 9-bit down counter (t8 to t0), a flag (t9) enabling 1-bit timer output, and a zero-detection circuit.
Figure 4-1. Timer Configuration
S1/LED
REM
Carrier
synchronous
circuit
Bit 3 of control register 0 (P3)
T
T1
T0
Count
clock
t9
t8 t7 t6 t5 t4 t3 t2 t1 t0
fX/64
9-bit down counter
fX/128
Zero-detection circuit
Timer operation end signal
(HALT # ×101B release
signal)
Bit 2 of control register 0 (P3)
Carrier signal
Data Sheet U14474EJ2V0DS00
19