M306V2EEFS datasheet(86/271 Pages) RENESAS

86 / 271 page

Rev.1.40

Oct 06, 2004 page 86 of 269

M306V2ME-XXXFP, M306V2EEFP

(2) Event counter mode

In this mode, the timer counts an internal timer’s overflow.

Table 2.10.2 Timer specifications in event counter mode

Item

Specification

Count source

• TB2 overflow, TAj overflow, TAk overflow

Count operation

• Up count or down count can be selected by external signal or software

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

before continuing counting (Note)

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

The timer overflows or underflows

TA2OUT/TA3OUT pin function

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

Read from timer

Count value can be read out by reading timer Ai register

Write to timer

• When counting stopped

When a value is written to timer Ai register, it is written to both reload register and counter

• When counting in progress

When a value is written to timer Ai register, it is written to only reload register

(Transferred to counter at next reload time)

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

Each time the timer overflows or underflows, the TAiOUT pin’s polarity is reversed

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

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