M306V2EEFS datasheet(85/271 Pages) RENESAS

85 / 271 page

Rev.1.40

Oct 06, 2004 page 85 of 269

M306V2ME-XXXFP, M306V2EEFP

Figure 2.10.11 Timer Ai mode register in timer mode (i = 0 to 4)

(1) Timer mode

In this mode, the timer counts an internally generated count source. (See Table 2.10.1.) Figure 2.10.11

shows the timer Ai mode register in timer mode.

Table 2.10.1 Specifications of timer mode

Item

Specification

Count source

f1, f8, f32, fc32

Count operation

• Down count

• When the timer underflows, it reloads the reload register contents before continuing counting

Divide ratio

1/(n+1)

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

When the timer underflows

TA2OUT/TA3OUT pin function

Programmable I/O port or pulse output

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

• Pulse output function

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

Notes 1 : The settings of the corresponding port register and port direction register

are invalid.

2: This bit of TAiMR (i = 0 1 4) must always be set to “0 ”

Timer Ai mode register

Symbol

Address

When reset

TAiMR(i=0 to 4)

039616 to 039A16

0016

Bit name

Function

Bit symbol

Operation mode

select bit

0 0 : Timer mode

b1 b0

TMOD1

TMOD0

MR0

Pulse output function

select bit

(Note 2)

0 : Pulse is not output

(TA2OUT/TA3OUT pin is a normal port pin)

1 : Pulse is output (Note 1)

(TA2OUT/TA3OUT pin is a pulse output pin)

Must always be set to “0”

Reserved

bits

MR3

0 (Must always be set to “0” in timer mode)

0 0 : f1

0 1 : f8

1 0 : f32

1 1 : fC32

b7 b6

TCK1

TCK0

Count source select bit

0 00

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