UPD17232MC datasheet(39/92 Pages) NEC

39 / 92 page

Data Sheet U14360EJ1V0DS00

µPD17230, 17231, 17232, 17233, 17234, 17235, 17236

5.2

Function of 8-bit Timer (with modulo function)

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

2. Bit 2 is a write-only bit.

Caution If the system clock is changed while the timer is counting, an error occurs in the timer as follows

(when system clock fX = 4 MHz):

•

High-speed mode 16/fX

→ Normal mode 32/fX ... (Error due to resolution of set timer) +1.5

µs

•

Normal mode 32/fX

→ High-speed mode 16/fX ... (Error due to resolution of set timer) –1.5

µs

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

(measurable time range: 8 s to 2.048 ms,

Resolution: 8 s (error: +8 s))

Count clock: fX/64

(measurable time range: 16 s to 4.096 ms,

Resolution: 16 s (error: +16 s))

Count clock: fX/256

(measurable time range: 64 s to 16.384 ms,

Resolution: 64 s (error: +64 s))

Remote controller carrier generator circuit output

(Carrier output: 1 s to 128 s, Resolution: 1 s)

Value indicated by parentheses is for when

( ): f

(system clock) = fX = 4MHz

SYS

Note 1

Note 2

µµ

UPD17232MC Datasheet(PDF) 39 Page - NEC

UPD17232MC Datasheet(HTML) 39 Page - NEC

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