TMP93CS41 datasheet(107/248 Pages) TOSHIBA

107 / 248 page

TMP93CS40/TMP93CS41

20004-02-10

93CS40-105

The operation of 8-bit timers will be described below:

(1) 8-bit timer mode

Two interval timers, designated “0” and “1”, can be used independently as 8-bit interval

timers. All interval timers operate in the same manner, and thus only the operation of

timer 1 will be explained below.

1. Generating interrupts in a fixed cycle

To generate timer 1 interrupts at constant intervals using timer 1 (INTT1), first stop

timer 1. Set the operation mode and input clock speed by setting TMOD, and the cycle time

by setting TREG1. Then, enable interrupt INTT1 and start the counting of timer 1.

Example: To generate timer 1 interrupt every 1 second at fs

= 32 kHz, set each register in

the following manner.

Clock condition

System clock:

Low frequency (fs)

Prescaler clock:

Low frequency (fs)

MSB

LSB

TRUN

← − X − − − − 0 −

Stop timer 1, and clear it to “0”.

TMOD

← 0 0 X X 1 0 − −

Set the 8-bit timer mode, and select

φT16 (4 ms at fs = 32

kHz) as the input clock.

TREG1

← 1 1 1 1 1 0 1 0

Set the timer register 1, 1 s

÷ φT16 = 250 = FAH (H

signifies hexadecimal).

INTET10

← 1 1 0 1 − − − −

Enable INTT1, and set it to “Level 5”.

TRUN

← 1 X − − − − 1 −

Start timer 1 counting.

X: Don’t care,

−: No change

Use Table 3.7.1 for selecting the input clock.

Note:

The input clock choices available for timer 0 and timer 1 differ from each other as

follows.

Timer 0: TI0 input,

φT1, φT4, φT16

Timer 1: Match detect signal of timer 0,

φT1, φT16, φT256

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