M16CSLASH29 datasheet(136/499 Pages) RENESAS

136 / 499 page

12. Timer A

page 112

Item

Specification

Count source

f1, f2, f8, f32, fC32

Count operation

• Decrement

• When the counter reaches 000016, it stops counting after reloading a new value

• If a trigger occurs when counting, the timer reloads a new count and restarts counting

Divide ratio

1/n

n : set value of TAi register 000016 to FFFF16

However, the counter does not work if the divide-by-n value is set to 000016.

Count start condition

TAiS bit in the TABSR register is set to 1 (start counting) and one of the

following triggers occurs.

• External trigger input from the TAiIN pin

• Timer B2 overflow or underflow,

timer Aj (j=i-1, except j=4 if i=0) overflow or underflow,

timer Ak (k=i+1, except k=0 if i=4) overflow or underflow

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

Count stop condition

• When the counter is reloaded after reaching 000016

• TAiS bit is set to 0 (stop counting)

Interrupt request generation timing

When the counter reaches 000016

TAiIN pin function

I/O port or trigger input

TAiOUT pin function

I/O port or pulse output

Read from timer

An undefined value is read by reading TAi register

Write to timer

• When not counting and until the 1st count source is input after counting start

Value written to TAi register is written to both reload register and counter

• When counting (after 1st count source input)

Value written to TAi register is written to only reload register

(Transferred to counter when reloaded next)

Select function

• Pulse output function

The timer outputs a low when not counting and a high when counting.

Table 12.4 Specifications in One-shot Timer Mode

12.1.3 One-shot Timer Mode

In one-shot timer mode, the timer is activated only once by one trigger. (See Table 12.4) When the

trigger occurs, the timer starts up and continues operating for a given period. Figure 12.11 shows the

TAiMR register in one-shot timer mode.

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