PD17225_15 Datasheet, PDF (36/86 Pages) Renesas Technology Corp – 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER

When bit 7 of NRZLTMM is 0 (carrier output)
NRZ
REM
µPD17225, 17226, 17227, 17228
MAX. 500 ns (delay)^Note
(fX = 4 MHz)
REM pin does not go low
until carrier goes low
even if NRZ becomes 0
Note
Value when (TMCK1, TMCK0) ≠ (1, 1).
When (TMCK1, TMCK0) = (1, 1), the value differs depending on how NRZ is manipulated. If NRZ is set
by an instruction, the width of the first high-level pulse may be shortened. If NRZ is set by data transferred
from NRZBF, the high-level pulse is delayed by the low-level pulse of the carrier clock.
When bit 7 of NRZLTMM is 0 (carrier not output)
NRZ
REM
3
2
0
0
3
2
0
0
1
0
Address On reset
R/W
0
NRZ
RF : 12H
0H
R/W
NRZ
0
1
NRZ Data
Outputs low level to REM pin
Outputs a carrier to REM pin or high level output
1
0
Address On reset
R/W
0
NRZBF RF : 11H
0H
R/W
NRZBF NRZ Data Output Next
0
NRZ buffer bit. Transfered to NRZ by interrupt
1
signal for 8-bit timer.
34
Data Sheet U12643EJ2V0DS00