M306S0FADGP datasheet(85/208 Pages) RENESAS

85 / 208 page

Rev.5.01

Dec 10, 2009

page 85 of 201

REJ03B0014-0501

M16C/6S Group

Item

Specification

Count source

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

Count operation

• Up-count 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 up-count

1/ (n + 1) for down-count

n : set value of TAi register

000016 to FFFF16

Count start condition

Set TAiS bit of 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 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

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

If the phase relationship is such that TAkIN(k=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 1.12.3. Specifications in Event Counter Mode (when processing two-phase pulse signal with timer A4)

TAkOUT

TAkIN

(k=3,4)

Count up all edges

Count down all edges

Timer A

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