7733 datasheet(130/940 Pages) RENESAS

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TIMER A

7733 Group User’s Manual

6–19

6.4 Event counter mode (Bits 1 and 0 of timer Ai mode register = “012”)

In this mode, an external signal is counted. (Refer to Tables 6.4.1 and 6.4.2.) Figures 6.4.1 and 6.4.2 show

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

Table 6.4.1 Specifications of event counter mode (when not using two-phase pulse signal processing function)

6.4 Event counter mode

Specifications

q External signal input to pin TAiIN

q “Falling edge” or “Rising edge” can be selected as the valid edge of

the count source by software.

q “Countup” or “countdown” can be selected by the external signal or

software

q At an overflow or underflow, the reload register’s contents is reloaded,

and counting is continued (Note).

Item

Count source

Count operation

Division ratio

Count start condition

Count stop condition

Interrupt request occurrence timing

Pin TAiIN’s function

Pin TAiOUT’s function

Read from timer

Write to timer

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

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

At an overflow or underflow

Count source input

Programmable I/O port, pulse output, or countup/countdown switch

signal input

A counter value can be read out by reading the timer Ai register.

s While counting is stopped

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

of the reload register and counter.

s While counting is in progress

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

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

time.)

< While counting up>

< While counting down>

(n + 1)

(FFFF16 – n + 1)

n: Set value in the timer Ai register

Note: This is applied when not using the free-run count function.

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