M30620FCAFP datasheet(339/615 Pages) RENESAS

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Timer A

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-22

Figure 2.2.16. Operation timing of 2-phase pulse signal process in event counter mode, normal mode selected

2.2.7 Operation of timer A (2-phase pulse signal process in event counter mode,

normal mode selected)

In processing 2-phase pulse signals in event counter mode, choose functions from those listed in Table

2.2.6. Operations of the circled items are described below. Figure 2.2.16 shows the operation timing, and

Figure 2.2.17 shows the set-up procedure.

Item

Count operation type

2-phase pulses

process (Note)

Set-up

Reload type

Free run type

Normal processing

4-multiplication processing

Table 2.2.6. Choosed functions

Note: Timer A3 alone can be selected. Timer A2 is solely used for normal processes, and timer A4 is solely used for 4

multiplication processes.

(1) Setting the count start flag to “1” causes the counter to count effective 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) 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”.

• The up count or down count conditions are as follows:

If a rising edge is present at the TAiIN pin when the input signal level to the TAiOUT pin is “H”,

an up count is performed.

If a falling edge is present at the TAiIN pin when the input signal level to the TAiOUT pin is “H”,

a down count is performed.

Operation

Note

000016

Count start flag

Timer Ai interrupt

request bit

“1”

“0”

“1”

“0”

FFFF16

TAiOUT

“H”

“L”

“H”

“L”

TAiIN

Set to “1” by software

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

(1) Start count

(2) Underflow

(3) Overflow

Time

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