7702 datasheet(144/217 Pages) RENESAS

144 / 217 page

TIMER B

6–8

7702/7703 Group User’s Manual

6.3 Timer mode

In this mode, the timer counts an internally generated count source. (Refer to Table 6.3.1.) Figure 6.3.1

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

Table 6.3.1 Specifications of timer mode

Item

Count source

Count operation

Divide ratio

Count start condition

Count stop condition

Interrupt request occurrence timing

TBiIN pin function

Read from timer Bi register

Write to timer Bi register

Specifications

f2, f16, f64, or f512

•Down-count

•When the counter underflows, reload register’s contents are reloaded

and counting continues.

When count start bit is set to “1.”

When count start bit is cleared to “0.”

When the counter underflows.

Programmable I/O port

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

reload register and counter.

q While counting is in progress

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

reload register. (Transferred to counter at next reload time.)

(n + 1)

n: Timer Bi register setting value

7702 Datasheet(PDF) 144 Page - Renesas Technology Corp