7702 datasheet(107/217 Pages) RENESAS

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TIMER A

7702/7703 Group User’s Manual

5–19

5.4 Event counter mode

(n + 1)

n: Timer Ai register setting value

5.4 Event counter mode

In this mode, the timer counts an external signal. (Refer to Tables 5.4.1 and 5.4.2.) Figure 5.4.1 shows the

structures of the timer Ai mode register and timer Ai register in the event counter mode.

Table 5.4.1 Specifications of event counter mode (when not using two-phase pulse signal processing

function)

(FFFF16 – n + 1)

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

q External signal input to the TAiIN pin

q The count source’s valid edge can be selected between the falling

and the rising edges by software.

q Up-count or down-count can be switched by external signal or software.

q When the counter overflows or underflows, reload register’s contents

are reloaded and counting continues.

q For down-count

q For up-count

When count start bit is set to “1.”

When count start bit is cleared to “0.”

When the counter overflows or underflows.

Count source input

Programmable I/O port, pulse output, or up-count/down-count switch

signal input

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

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