UPD62A NEC, UPD62A Datasheet - Page 19

• Manufacturer Part Number: UPD62A
• Description: 4-BIT SINGLE-CHIP MICROCONTROLLER FOR INFRARED REMOTE CONTROL TRANSMISSION
• Manufacturer: NEC

S
1
/LED
REM
4. TIMER
4.1 Timer Configuration
of a 9-bit down counter (t
The timer is the block used for creating a remote control transmission pattern. As shown in Figure 4-1, it consists
Carrier
synchronous
circuit
8
to t
0
), a flag (t
t
9
Figure 4-1. Timer Configuration
9
) enabling 1-bit timer output, and a zero-detection circuit.
t
8
T1
Data Sheet U14474EJ1V0DS00
t
7
Zero-detection circuit
Bit 2 of control register 0 (P3)
t
6
9-bit down counter
t
Carrier signal
5
T
t
4
T0
t
3
t
2
t
Timer operation end signal
(HALT # 101B release
1
signal)
t
0
Count
clock
Bit 3 of control register 0 (P3)
PD62A
f
f
X
X
/64
/128
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