M30620FCAFP datasheet(522/615 Pages) RENESAS

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Timer A Applications

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-205

Figure 3.4.2. Set-up procedure of buzzer output

Initialization of timer A0

Selection of timer mode

Pulse output function select bit

0 : Pulse is not output (TA0out pin is a normal port pin)

Gate function select bit

b4 b3

0 0 : Gate function not available

0 (Must always be “0” in timer mode)

Count source select bit

b7 b6

0 0 : f1

Timer A0 mode register

TA0MR [Address 039616 ]

Timer A0 register

TA0 [Address 038716, 038616]

b15

0F16

9F16

Count start flag [Address 038016]

TABSR

Timer A0 count start flag

1 : Starts counting

Initialization of port P7 direction register

Port P70 direction register

0 : Input mode

Port P7 direction register [Address 03EF16]

PD7

Pulse output function select bit

1 : Pulse is output (Port P70 is TA0OUT output pin)

Timer A0 mode register [Address 039616 ]

TA0MR

Buzzer ON

Pulse output function select bit

0 : Pulse is not output

Timer A0 mode register [Address 039616 ]

TA0MR

Buzzer OFF

Count source period

f(XIN) : 16MHZ

f(XcIN) : 32.768kHZ

b7 b6

Count

source

62.5ns

500ns

2µs

976.56µs

f32

fC32

M30620FCAFP Datasheet(PDF) 522 Page - Renesas Technology Corp

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