M16CSLASH26 datasheet(89/239 Pages) RENESAS

89 / 239 page

Timer A

Renesas Technology Corp.

M16C/26 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Under

development

Preliminary Specifications Rev. 0.9

Specifications in this manual are tentative and subject to change.

Item

Specification

Count source

• Two-phase pulse signals input to TAiIN or TAiOUT pin

Count operation

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

• When the timer overflows or underflows, the reload register content is

reloaded and the timer starts over again (Note 1)

Divide ratio

1/ (FFFF16 - n + 1) for up count

1/ (n + 1) for down count

n : Set value

Count start condition

Count start flag is set (= 1)

Count stop condition

Count start flag is reset (= 0)

Interrupt request generation timing

Timer overflows or underflows

TAiIN pin function

Two-phase pulse input (Set the TAiIN pin correspondent port direction register to “0”.)

TAiOUT pin function

Two-phase pulse input

(Set the TAiOUT pin correspondent port direction register to “0”.)

Read from timer

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

Write to timer

• When counting stopped

When a value is written to timer A2, A3, or A4 register, it is written to both

reload register and counter

• When counting in progress

When a value is written to timer A2, A3, or A4 register, it is written to only

reload register. (Transferred to counter at next reload time.)

Select function (Note 2)

• Normal processing operation (timer A2 and timer A3)

The timer counts up rising edges or counts down falling edges on the

TAiIN pin when input signal on the TAiOUT pin is “H”.

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

If the phase relationship is such that the TAiIN pin goes “H” when the input

signal on the TAiOUT pin is “H”, the timer counts up rising and falling edges

on the TAiOUT and TAiIN pins. If the phase relationship is such that the

TAiIN pin goes “L” when the input signal on the TAiOUT pin is “H”, the timer

counts down rising and falling edges on the TAiOUT and TAiIN pins.

Note 1: This does not apply when the free-run function is selected.

Note 2: Timer A3 alone can be selected. Timer A2 is fixed to normal processing operation, and timer A4 is fixed to

multiply-by-4 processing operation.

TAiOUT

TAiIN

(i=3,4)

Count up all edges

Count down all edges

TAiOUT

count

Down

count

Down

count

Down

count

TAiIN

(i=2,3)

Table 1.12.3. Timer specifications in event counter mode

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

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