38K2 datasheet(178/358 Pages) RENESAS

178 / 358 page

2.3 Timer

Rev.2.00

Oct 15, 2006

page 29 of 112

38K2 Group

REJ09B0338-0200

APPLICATION

PREX

124

Timer X mode register (address 2316)

Timer X operating mode: Timer mode

Timer X count: Stop

Clear to “0” when starting count.

Prescaler X (address 2416)

Timer X (address 2516)

Set “division ratio – 1”

ICON1

Timer X interrupt: Enabled

Interrupt control register 1 (address 3E16)

IREQ1

Interrupt request register 1 (address 3C16)

Timer X interrupt request

(becomes “1” at 10 ms intervals)

Fig. 2.3.11 Related registers setting

(2)

Timer application example 1: Clock function (measurement of 10 ms)

Outline: The input clock is divided by the timer so that the clock can count up at 10 ms intervals.

Specifications: •The clock f(XIN) = 6 MHz is divided by the timer.

•The clock is counted up in the process routine of the timer X interrupt which occurs

at 10 ms intervals.

Figure 2.3.10 shows the timers connection and setting of division ratios; Figure 2.3.11 shows the

related registers setting; Figure 2.3.12 shows the control procedure.

Fig. 2.3.10 Timers connection and setting of division ratios

f(XIN) = 6 MHz

10 ms

1/16

1/30

1/125

1/100

1 second

Dividing by 100 with software

Fixed

Prescaler X

Timer X

Timer X interrupt

request bit

0 or 1

0 : No interrupt request issued

1 : Interrupt request issued

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