M30245 datasheet(21/367 Pages) RENESAS

21 / 367 page

Rev.2.00 Oct 16, 2006

page 12 of 354

REJ09B0340-0200

M30245 Group

2. Timer A

In timer mode, choose functions from those listed in Table 2.2.1. Operations of the circled items are

described below. Figure 2.2.6 shows the operation timing, and Figure 2.2.7 shows the set-up procedure.

Item

Count source

Pulse output function

Gate function

Set-up

Internal count source (f1 / f8 / f32 / fc32)

No pulses output

Pulses output

No gate function

Performs count only for the period in which the TAiIN pin is at “L” level

Performs count only for the period in which the TAiIN pin is at “H” level

Operation (1) Setting the count start flag to “1” causes the counter to perform a down count on the count

source.

(2) If an underflow occurs, the content of the reload register is reloaded, and the count continues.

At this time, the timer Ai interrupt request bit goes to “1”.

(3) Setting the count start flag to “0” causes the counter to hold its value and to stop.

2.2.2 Operation of Timer A (timer mode)

Table 2.2.1. Choosed functions

Figure 2.2.6. Operation timing of timer mode

FFFF16

000016

Time

Start count again

Count start flag

Timer Ai interrupt

request bit

“1”

n = reload register content

Set to “1” by software

“0”

Set to “1” by software

Cleared to “0” by

software

Cleared to “0” when interrupt request is accepted, or cleared by software

(1) Start count

(2) Underflow

(3) Stop count

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