M32CSLASH8A datasheet(178/372 Pages) RENESAS

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M32C/8A Group

15. Timers (Timer A)

Rev.1.00

Jul 15, 2007

Page 161 of 352

REJ09B0385-0100

15.1.3

One-Shot Timer Mode

When a trigger occurs, the counter decrements until underflows. Then, the counter is reloaded and stops until

the next trigger occurs.

Table 15.6 lists specifications of one-shot timer mode. Figure 15.18 shows a one-shot timer mode operation.

Table 15.6

Specifications of One-Shot Timer Mode

NOTES:

1. Bits CNT3 to CNT0 in the TCSPR register select no division (n = 0) or divide-by-2n (n = 1 to 15).

2. Wait for one count source cycle or more to write after the count starts.

Item

Specification

Count source

f1, f8, f2n(1), fC32

Count operation

• Counter decrements

When the counter reaches 0000h, the counter is reloaded and stops until the

next trigger occurs.

If a trigger occurs while counting, the contents of the reload register are

reloaded into the counter and the count continues.

Number of counting

n times

n: setting value of the TAi register (i = 0 to 4), 0000h to FFFFh

(but the counter does not run if n = 0000h)

Count start condition

A trigger, selectable from the following, occurs while the TAiS bit in the TABSR

• the TAiOS bit in the ONSF register is set to 1 (timer starts)

• an external trigger is applied to TAiIN pin

• timer B2 overflows or underflows,

• timer Aj overflows or underflows (j = i - 1, except j = 4 if i = 0),

• timer Ak overflows or underflows (k = i + 1, except k = 0 if i = 4)

Count stop condition

• After the counter reaches 0000h and the counter value is reloaded

• When the TAiS bit is set to 0 (count stops)

Interrupt request generation timing When the counter reaches 0000h

TAiIN pin function

Trigger input

TAiOUT pin function

Pulse output

Read from timer

A read from the TAi register returns undefined value

Write to timer

• A write to the TAi register while the count is stopped:

The value is written to both the reload register and the counter.

• A write to the TAi register while counting:

The value is written to the reload register (It is transferred to the counter at the

next reload timing).(2)

Selectable function

Pulse output function

“L” is output while the count stops. “H” is output while counting.

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