UPD6134 NEC, UPD6134 Datasheet - Page 21

• Manufacturer Part Number: UPD6134
• Description: 4-BIT SINGLE-CHIP MICROCONTROLLER FOR INFRARED REMOTE CONTROL TRANSMISSION
• Manufacturer: NEC

4.3 Carrier Output
register 0.
to be output until its next fall and then stops due to the function of the carrier synchronous circuit . When the timer
starts operation, however, the high-level width of the first carrier may become shorter than the specified width.
4.4 Software Control of Timer Output
instruction cycle (8/f
The carrier for remote-controlled transmission can be output from the REM pin by clearing (to 0) bit 2 of the control
As shown in Figure 4-3, in the case where the timer stops when the carrier is at a high level, the carrier continues
Notes 1. Error when the REM output ends: Lead by “the carrier’s low-level width” to lag by “the carrier’s high-
The timer output can be controlled by software. As shown in Figure 4-4, the pulse with a minimum width of 1-
2. Error of the carrier’s high-level width: 0 to “the carrier’s high-level width”
LED
REM (at low-level start)
REM (at high-level start)
X
) can be output.
REM
LED
MOV T, #0000000000B; low-level output from the REM pin
MOV T, #1000000000B; high-level output from the REM pin
MOV T, #0000000000B; low-level output from the REM pin
Figure 4-4. Pulse Output of 1-Instruction Cycle Width
Figure 4-3. Timer Output (When Carrier Is Output)
Data Sheet U10454EJ6V0DS00
Note 2
level width”
Timer value: (Set value+1)
8/f
X
8/f
X
(or 16/f
X
)
Note 1
PD6133, 6134
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