M30620FCAFP datasheet(332/615 Pages) RENESAS

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Timer A

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-15

Figure 2.2.9. Set-up procedure of timer mode, gate function selected

Setting counter value

Can be set to 000016 to FFFF16

(b15)

(b8)

Timer A0 register [Address 038716, 038616]TA0

Timer A1 register [Address 038916, 038816]TA1

Timer A2 register [Address 038B16, 038A16]TA2

Timer A3 register [Address 038D16, 038C16]TA3

Timer A4 register [Address 038F16, 038E16]TA4

Pulse output function select bit

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

Selecting timer mode and functions

Timer Ai mode register (i=0 to 4) [Address 039616 to 039A16]

TAiMR (i=0 to 4)

Gate function select bit

1 1 : Timer counts only when TAiIN pin is held “H” (Note)

b4 b3

Selection of timer mode

0 (Must always be “0” in timer mode)

Count source select bit

0 0 : f1

0 1 : f8

1 0 : f32

1 1 : fC32

b7 b6

Note: Set the corresponding port direction register to “0”.

Setting clock prescaler reset flag

(This function is effective when fC32 is selected as the count source. Reset the prescaler for generating fC32 by

dividing the XCIN by 32.)

Clock prescaler reset flag [Address 038116]

CPSRF

Clock prescaler reset flag

0 : No effect

1 : Prescaler is reset (When read, the value is “0”)

Setting count start flag

Count start flag [Address 038016]

TABSR

Timer A0 count start flag

Timer A1 count start flag

Timer A2 count start flag

Timer A3 count start flag

Timer A4 count start flag

Start count

Count source period

f(XIN) : 16MHZ

f(XcIN) : 32.768kHZ

b7 b6

Count

source

62.5ns

500ns

2µs

976.56µs

f32

fC32

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