M16CSLASH29 datasheet(133/499 Pages) RENESAS

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12. Timer A

page 109

Item

Specification

Count source

• Two-phase pulse signals input to TAiIN or TAiOUT pins (i = 2 to 4)

Count operation

• Increment or down-count can be selected by two-phase pulse signal

• 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.

Divide 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

Two-phase pulse input

TAiOUT pin function

Two-phase pulse input

Read from timer

Count value can be read by reading timer A2, A3 or A4 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 reload register

(Transferred to counter when reloaded next)

Select function (Note)

• Normal processing operation (timer A2 and timer A3)

The timer counts up rising edges or counts down falling edges on TAjIN pin

when input signals on TAjOUT pin is “H”.

• Multiply-by-4 processing operation (timer A3 and timer A4)

If the phase relationship is such that TAkIN(k=3, 4) pin goes “H” when the

input signal on TAkOUT pin is “H”, the timer counts up rising and falling

edges on TAkOUT and TAkIN pins. If the phase relationship is such that

TAkIN pin goes “L” when the input signal on TAkOUT pin is “H”, the timer

counts down rising and falling edges on TAkOUT and TAkIN pins.

Table 12.3 Specifications in Event Counter Mode

(when processing two-phase pulse signal with timers A2, A3 and A4)

• Counter initialization by Z-phase input (timer A3)

The timer count value is initialized to 0 by Z-phase input.

NOTE:

1. Only timer A3 is selectable. Timer A2 is fixed to normal processing operation, and timer A4 is fixed to

multiply-by-4 processing operation.

TAjOUT

Increment

Increment Decrement

Decrement

TAjIN

(j=2,3)

TAkOUT

TAkIN

(k=3,4)

Increment

all edges

Increment

all edges

Decrement

all edges

Decrement

all edges

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