upd64a Renesas Electronics Corporation., upd64a Datasheet - Page 21

• Manufacturer Part Number: upd64a
• Description: 4-bit Single-chip Microcontroller For Infrared Remote Control Transmission
• Manufacturer: Renesas Electronics Corporation.

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 (64/f
The carrier for remote-controlled transmission can be output from the REM pin by clearing (0) bit 2 of control
Notes 1. Error when the REM output ends: Lead by “carrier low-level width” to lag by “carrier high-
The timer output can be controlled by software. As shown in Figure 4-4, a pulse with a minimum width of 1
As shown in Figure 4-3, in the case where the timer stops when the carrier is at a high level, the carrier continues
2. Error of carrier high-level width: 0 to “carrier high-level width”
LED
REM (low-level start)
REM (high-level start)
X
) can be output.
REM
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
LED
Figure 4-4. Pulse Output of 1 Instruction Cycle Width
Figure 4-3. Timer Output (When Carrier Is Output)
Data Sheet U14380EJ3V0DS00
Note 2
Timer value: (Set value + 1) 64/f
level width”
64/f
X
X
(or 128/f
X
Note 1
)
PD64A, 65
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