7733 datasheet(143/940 Pages) RENESAS

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TIMER A

7733 Group User’s Manual

6–32

6.5 One-shot pulse mode (Bits 1 and 0 of timer Ai mode register = “102”)

In this mode, a pulse which has an arbitrary width is output once. (Refer to Table 6.5.1.) After a trigger

occurs, “H” level is output from pin TAiOUT for an arbitrary time. Figure 6.5.1 shows the structures of the

timer Ai mode register and timer Ai register in the one-shot pulse mode.

Table 6.5.1 Specifications of one-shot pulse mode

6.5 One-shot pulse mode

Item

Count source

Count operation

Output pulse width (“H”)

Count start condition

Count stop condition

Interrupt request occurrence timing

Pin TAiIN’s function

Pin TAiOUT’s function

Read from timer

Write to timer

Specifications

Clock f2, f16, f64, or f512

q Countdown

q When the counter value reaches “000016,” the reload register’s contents

is reloaded, and counting stops.

q When a trigger occurs while counting is in progress, the reload

n: Set value in the timer Ai register

q When a trigger occurs. (Note)

q Internal or external trigger can be selected by software.

q When the counter value reaches “000016.”

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

When counting stops.

Programmable I/O port or trigger input

One-shot pulse output

An undefined value is 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.)

[s]

Clocks f2, f16, f64, and f512: Refer to chapter “14. CLOCK GENERATING CIRCUIT.”

Note: A trigger occurs when the count start flag = “1.”

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