M38C31M7AXXXFS datasheet(89/224 Pages) RENESAS

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2-24

38C3 Group User’s Manual

APPLICATION

2.2 Timer

Fig. 2.2.22 Control procedure

Fig. 2.2.21 Relevant registers setting

T34M

3F16

ICON1

Timer 34 mode register (address 2916)

Timer 3 count: In progress

Timer 3 count source: f(XIN)/16

Timer 3 output selection: Buzzer output in progress = “1”

Buzzer output stopped = “0”

Set “division ratio – 1”; 63 (3F16).

Interrupt control register 1 (address 3E16)

Timer 3 (address 2216)

Timer 3 interrupt: Disabled

RESET

SEI

P4D

ICON1

T34M

CLI

3F16

(address 0916), bit6

(address 0816), bit6

(address 3E16), bit7

(address 2916)

(address 2216)

T34M

(address 2916), bit 6

(address 2216)

3F16

T34M(address 2916), bit 6

Main processing

Initialization

q X: This bit is not used here. Set it to “0” or “1” arbitrarily.

•All interrupts disabled

00XX00X02

Output unit

Buzzer request ?

Yes

Stop of piezoelectric buzzer

output

Start of piezoelectric buzzer output

•Timer 3 interrupt disabled

•T3OUT output stopped; Buzzer output stopped

•Port state setting at buzzer output stopped; “H” level output

•Interrupts enabled

•Processing buzzer request, generated during main

processing, in output unit

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