7906 datasheet(132/531 Pages) RENESAS

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TIMER A

7906 Group User’s Manual Rev.2.0

7-29

Item

Count source fi

Count operation

Output pulse width (“H”)

Count start condition

Count stop condition

Interrupt request occurrence timing

TAjIN pin’s function

TAjOUT pin’s function

Read from timer Aj register

Write to timer Aj register

Specifications

f1, f2, f16, f64, f512, or f4096

q Countdown

q When the counter value becomes “000016,” reload register’s con-

tents are reloaded, and counting stops.

q If a trigger occurs during counting, reload register’s contents are

reloaded, and counting continues.

q When a trigger occurs. (Note)

q Internal or external trigger can be selected by software.

q When the counter value becomes “000016”

q When the count start bit is cleared to “0”

When counting stops.

Programmable I/O port pin or trigger input pin

One-shot pulse output

An undefined value is read out.

q While counting is stopped

When a value is written to timer Aj register, it is written to both of

the reload register and counter.

q While counting is in progress

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

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

7.5 One-shot pulse mode

Timer Aj (j = 0 to 2, 4, 9) is equipped with the one-shot pulse mode. In this mode, the timer outputs a pulse

which has an arbitrary width once.

When a trigger occurs, the timer outputs “H” level from the TAjOUT pin for an arbitrary time. Table 7.5.1 lists

the specifications of the one-shot pulse mode. Figure 7.5.1 shows the structures of the timer Aj register and

timer Aj mode register in the one-shot pulse mode.

Each of timers A3, A5 to A8 is not equipped with this mode.

Table 7.5.1 Specifications of one-shot pulse mode

7.5 One-shot pulse mode

[s]

n : Timer Aj register’s set value

Note: The trigger is generated with the count start bit = “1.”

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