7702 datasheet(97/217 Pages) RENESAS

97 / 217 page

TIMER A

7702/7703 Group User’s Manual

5–9

5.3 Timer mode

In this mode, the timer counts an internally generated count source. (Refer to Table 5.3.1.) Figure 5.3.1

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

Table 5.3.1 Specifications of timer mode

Item

Count source

Count operation

Divide ratio

Count start condition

Count stop condition

Interrupt request occurrence timing

TAiIN pin function

TAiOUT pin function

Read from timer Ai register

Write to timer Ai 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 or gate input

Programmable I/O port or pulse output

Counter value can be read out.

q While counting is stopped

When a value is written to timer Ai register, it is written to both

reload register and counter.

q While counting is in progress

When a value is written to timer Ai register, it is written to only

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

n : Timer Ai register setting value

(n + 1)

7702 Datasheet(PDF) 97 Page - Renesas Technology Corp