M16CSLASH29 datasheet(131/499 Pages) RENESAS

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12. Timer A

page 107

Item

Specification

Count source

• External signals input to TAiIN pin (i=0 to 4) (effective edge can be selected

in program)

• Timer B2 overflows or underflows,

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

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

Count operation

• Increment or decrement can be selected by external signal or program

• When the timer overflows or underflows, it reloads the reload register con-

tents and continues counting. When operating in free-running mode, the

timer continues counting without reloading.

Divided ratio

1/ (FFFF16 - n + 1) for increment

1/ (n + 1) for down-count

n : set value of TAi register 000016 to FFFF16

Count start condition

Set TAiS bit in the TABSR register to 1 (start counting)

Count stop condition

Set TAiS bit to 0 (stop counting)

Interrupt request generation timing Timer overflow or underflow

TAiIN pin function

I/O port or count source input

TAiOUT pin function

I/O port, pulse output, or up/down-count select input

Read from timer

Count value can be 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

• Free-run count function

Even when the timer overflows or underflows, the reload register content is

not reloaded to it

• Pulse output function

Whenever the timer underflows or underflows, the output polarity of TAiOUT

pin is inverted . When not counting, the pin outputs a low.

12.1.2 Event Counter Mode

In event counter mode, the timer counts pulses from an external device or overflows and underflows of

other timers. Timers A2, A3, and A4 can count two-phase external signals. Table 12.2 lists specifica-

tions in event counter mode (when not processing two-phase pulse signal). Table 12.3 lists specifica-

tions in event counter mode (when processing two-phase pulse signal with the timers A2, A3 and A4).

Figure 12.8

shows TAiMR register in event counter mode (when not processing two-phase pulse signal).

Figure 12.9

shows TA2MR to TA4MR registers in event counter mode (when processing two-phase

pulse signal with the timers A2, A3 and A4).

Table 12.2 Specifications in Event Counter Mode (when not processing two-phase pulse signal)

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