UPD6134GS datasheet(21/64 Pages) NEC

21 / 64 page

µPD6133, 6134

Data Sheet U10454EJ6V0DS00

4.3 Carrier Output

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

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.

Figure 4-3. Timer Output (When Carrier Is Output)

Timer value: (Set value+1)

× 8/fX (or 16/fX)

LED

REM (at low-level start)

REM (at high-level start)

Note 1

Note 2

Notes 1. Error when the REM output ends: Lead by “the carrier’s low-level width” to lag by “the carrier’s high-

level width”

2. Error of the carrier’s high-level width: 0 to “the carrier’s high-level width”

4.4 Software Control of Timer Output

The timer output can be controlled by software. As shown in Figure 4-4, the pulse with a minimum width of 1-

instruction cycle (8/fX) can be output.

Figure 4-4. Pulse Output of 1-Instruction Cycle Width

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

8/fX

LED

REM

UPD6134GS 데이터시트(PDF) 21 Page - NEC