PD17225_15 Datasheet, PDF (34/86 Pages) Renesas Technology Corp – 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER

µPD17225, 17226, 17227, 17228
5.2 Function of 8-bit Timer (with modulo function)
3
TMEN
2
TMRES
1
TMCK1
0
TMCK0
Address
RF : 33H
On reset
8H ^{Note 1}
R/W
R/W ^{Note 2}
TMCK1
0
0
1
TMCK0
0
1
0
8-Bit Timer Clock Source Selection
Count clock: fX/32
(Measurement time range: 8 µ s to 2.048 ms)
Count clock: fX/64
(Measurement time range: 16 µs to 4.096 ms)
Count clock : fX/256
(Measurement time range: 64 µs to 16.384 ms)
1
1
Remote control carrier generation circuit output
Value indicated by parentheses is for when
( ): f SYS (system clock) = fX = 4MHz
TMRES 8-Bit Timer Reset Flag
0
Data read out is always "0"
1
Resets 8-bit counter and IRQTM
TMEN
0
1
8-Bit Timer Count Enable Flag
Stops 8-bit timer count operation
Enable 8-bit timer count operation (falling edge)
Notes 1. When the STOP mode is released, bit 3 must be set.
2. Bit 2 is a write-only bit.
NRZLTMM
76543210
Address
On reset
R/W
×
7-bit modulo register
Peripheral register: 03H
Undefined
R/W
Bit 7
0
1
Output Control of REM Pin
When NRZ = 1, carrier output to REM pin
When NRZ = 1, high-level output to REM pin
NRZHTMM
76543210
0
7-bit modulo register
Address
Peripheral register: 04H
Bit 7
Fixed to 0
32
Data Sheet U12643EJ2V0DS00
On reset
Undefined
R/W
R/W