M30620FCAFP datasheet(333/615 Pages) RENESAS

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Timer A

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-16

Figure 2.2.10. Operation timing of timer mode, pulse output function selected

2.2.4 Operation of Timer A (timer mode, pulse output function selected)

In timer mode, choose functions from those listed in Table 2.2.3. Operations of the circled items are

described below. Figure 2.2.10 shows the operation timing, and Figure 2.2.11 shows the set-up proce-

dure.

FFFF16

000016

Time

Count start flag

Timer Ai interrupt

request bit

“1”

n = reload register content

Pulse output from

TAiOUT pin

“H”

“0”

“L”

“0”

Set to “1” by software

Cleared to “0” by

software

(3) Stop count

Cleared to “0” when interrupt request is accepted, or cleared by software

(1) Start count

(2) Underflow

Start count again

Item

Count source

Pulse output function

Gate function

Set-up

Internal count source(f1 / f8 / f32 / fc32)

No pulses output

Pulses output

No gate function

Performs count only for the period in which the TAiIN pin is at “L” level

Performs count only for the period in which the TAiIN pin is at “H” level

Table 2.2.3. Choosed functions

(1) Setting the count start flag to “1” causes the counter to perform a down count on the count

source.

(2) If an underflow occurs, the content of the reload register is reloaded and the count continues.

At this time, the timer Ai interrupt request bit goes to “1”. Also, the output polarity of the

TAiOUT pin reverses.

(3) Setting the count start flag to “0” causes the counter to hold its value and to stop. Also, the

TAiOUT pin outputs an “L” level.

Operation

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