7906 datasheet(122/531 Pages) RENESAS

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TIMER A

7906 Group User’s Manual Rev.2.0

7-19

Item

Count source

Count operation

Division ratio

Count start condition

Count stop condition

Interrupt request occurrence timing

Function of the following pins:

• TA2IN, TA2OUT

• TA4IN, TA4OUT

• TA9IN, TA9OUT

Read from timer A2/A4/A9 register

Write to timer A2/A4/A9 register

Specifications

External signal (two-phase pulse) input to the following pins:

• TA2IN, TA2OUT

• TA4IN, TA4OUT

• TA9IN, TA9OUT

q Countup or countdown can be switched by external signal (two-

phase pulse).

q When a counter overflow or underflow occurs, reload register’s con-

tents are reloaded, and counting continues.

q For countdown

q For countup

When the count start bit is set to “1.”

When the count start bit is cleared to “0.”

When a counter overflow or underflow occurs.

Two-phase pulse input

Counter value can be read out by reading timer A2/A4/A9 register.

q While counting is stopped

When a value is written to timer A2/A4/A9 register, it is written to

both of the reload register and counter.

q While counting is in progress

When a value is written to timer A2/A4/A9 register, it is written only to the

reload register. (Transferred to the counter at the next reload timing.)

Table 7.4.2 Specifications of event counter mode (when using two-phase pulse signal processing

function in timers A2, A4, and A9)

7.4 Event counter mode

(n + 1)

n: Timer A2/A4/A9 register’s set value

(FFFF16 – n + 1)

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