M30620FCAFP datasheet(331/615 Pages) RENESAS

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Timer A

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-14

2.2.3 Operation of Timer A (timer mode, gate function selected)

Figure 2.2.8. Operation timing of timer mode, gate function selected

In timer mode, choose functions from those listed in Table 2.2.2. Operations of the circled items are

described below. Figure 2.2.8 shows the operation timing, and Figure 2.2.9 shows the set-up procedure.

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 2.2.2. Choosed functions

(1) When the count start flag is set to “1” and the TAiIN pin inputs at “H” level, the counter per-

forms a down count on the count source.

(2) When the TAiIN pin inputs at “L” level, the counter holds its value and stops.

(3) 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”.

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

• Make the pulse width of the signal input to the TAiIN pin not less than two cycles of the count

source.

Operation

Note

FFFF16

000016

Time

Count start flag

Timer Ai interrupt

request bit

“1”

n = reload register content

TAiIN pin

input signal

(2) Stop count

“0”

Set to “1” by software

“H”

“L”

(4) Stop count

(1) Start count

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

(3) Underflow

Set to “1” by software

Cleared to “0” by

software

Start count again.

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