7733 datasheet(131/940 Pages) RENESAS

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TIMER A

7733 Group User’s Manual

6–20

Item

Count source

Count operation

Division ratio

Count start condition

Count stop condition

Interrupt request occurrence timing

Pin TAjIN, TAjOUT’s (j = 2 to 4) function

Read from timer

Write to timer

Table 6.4.2 Specifications of event counter mode (when using two-phase pulse signal processing

function in timers A2, A3, and A4)

Specifications

External signal (two-phase pulse) input to pin TAjIN or TAjOUT

(j = 2 to 4)

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

(two-phase pulse).

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

and counting is continued. (Note)

6.4 Event counter mode

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

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

At an overflow or underflow

Two-phase pulse input

A counter value can be read out by reading the timer A2, A3, or A4 register.

s While counting is stopped

When a value is written to the timer A2, A3, or A4 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 A2, A3, or A4 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 Aj register

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

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