M30620FCAFP datasheet(337/615 Pages) RENESAS

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Timer A

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-20

Figure 2.2.14. Operation timing of event counter mode, free run type selected

2.2.6 Operation of Timer A (event counter mode, free run type selected)

In event counter mode, choose functions from those listed in Table 2.2.5. Operations of the circled items

are described below. Figure 2.2.14 shows the operation timing, and Figure 2.2.15 shows the set-up

procedure.

Note: j = i – 1, but j = 4 when i = 0

(1) Setting the count start flag to “1” causes the counter to count the falling edges of the count

source.

(2) Even if an underflow occurs, the content of the reload register is not reloaded, but the count

continues. At this time, the timer Ai interrupt request bit goes to “1”.

(3) If switching from an up count to a down count or vice versa while a count is in progress, the

switch takes effect from the next effective edge of the count source.

(4) Even if an overflow occurs, the content of the reload register is not reloaded, but the count

continues. At this time, the timer Ai interrupt request bit goes to “1”.

Item

Set-up

Count source

Input signal to TAiIN

(counting falling edges)

Input signal to TAiIN

(counting rising edges)

Timer overflow

(TB2/TAj overflow)

Count operation type

Reload type

Free-run type

Factor for switching

between up and

down

Content of up/down flag

Input signal to TAiOUT

Pulse output function

No pulses output

Pulses output

Table 2.2.5. Choosed functions

Operation

FFFF16

000016

Time

n = reload register content

(1) Start count

Count start flag

“1”

“0”

Timer Ai interrupt

request bit

“1”

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

“0”

Up/down flag

“1”

“0”

Set to “1” by software

(2) Underflow

(3) Switch count

(4) Overflow

Set to “1” by software

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