7906 datasheet(159/531 Pages) RENESAS

159 / 531 page

7906 Group User’s Manual Rev.2.0

8-8

TIMER B

8.3 Timer mode

In this mode, the timer counts an internally generated count source. Table 8.3.1 lists the specifications of

the timer mode. Figure 8.3.1 shows the structures of the timer Bi register and timer Bi mode register in the

timer mode.

Table 8.3.1 Specifications of timer mode

8.3 Timer mode

Item

Count source fi

Count operation

Division ratio

Count start condition

Count stop condition

Interrupt request occurrence timing

TBiIN pin’s function

Read from timer Bi register

Write to timer Bi register

Specifications

f2, f16, f64, or f512

•Countdown

•When a counter underflow occurs, reload register’s contents are re-

loaded, and counting continues.

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

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

When a counter underflow occurs.

Programmable I/O port pin

Counter value can be read out.

q While counting is stopped

When a value is written to the timer Bi register, it is written to both

of the reload register and counter.

q While counting is in progress

When a value is written to the timer Bi register, it is written only to the

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

(n + 1)

n: Timer Bi register’s set value

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