UPD17217GT datasheet(31/84 Pages) NEC

31 / 84 page

µPD17215, 17216, 17217, 17218

5.2

Function of 8-bit Timer (with modulo function)

TMEN

TMRES

TMCK1

TMCK0

Address

RF : 33H

TMRES

On reset

R/W

8-Bit Timer Reset Flag

Data read out is always "0"

Resets 8-bit counter and IRQTM

TMEN

8-Bit Timer Count Enable Flag

Stops 8-bit timer count operation

Enable 8-bit timer count operation (falling edge)

TMCK1

TMCK0

8-Bit Timer Clock Source Selection

Count clock: fX/32

(Measurement time range: 8 s to 2.048 ms)

Count clock: fX/64

(Measurement time range: 16 s to 4.096 ms)

Count clock : fX/256

(Measurement time range: 64 s to 16.384 ms)

Remote control carrier generation circuit output

Value indicated by parentheses is for when

( ): f

(system clock) = f = 4MHz

SYS

NRZLTMM

Address

On reset

R/W

Peripheral register: 03H

Undefined

R/W

76543210

7-bit modulo register

Bit 7

Output Control of REM Pin

When NRZ = 1, carrier output to REM pin

When NRZ = 1, high-level output to REM pin

NRZHTMM

Address

On reset

R/W

Peripheral register: 04H

Undefined

R/W

76543210

7-bit modulo register

Bit 7

Fixed to 0

*1: When the STOP mode is released, bit 3 must be set.

2: Bit 2 is a write-only bit.

UPD17217GT Datasheet(PDF) 31 Page - NEC

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