M306V2EEFS datasheet(88/271 Pages) RENESAS

88 / 271 page

Rev.1.40

Oct 06, 2004 page 88 of 269

M306V2ME-XXXFP, M306V2EEFP

Figure 2.10.13 Timer Ai mode register in one-shot timer mode (i = 0 to 4)

(3) One-shot timer mode

In this mode, the timer operates only once. (See Table 2.10.3.) When a trigger occurs, the timer starts up

and continues operating for a given period. Figure 2.10.13 shows the timer Ai mode register in one-shot

timer mode.

Table 2.10.3 Timer specifications in one-shot timer mode

Item

Specification

Count source

f1, f8, f32, fC32

Count operation

• The timer counts down

• When the count reaches 000016, the timer stops counting after reloading a new count

• If a trigger occurs when counting, the timer reloads a new count and restarts counting

Divide ratio

1/n

n : Set value

Count start condition

• The timer overflows

• The one-shot start flag is set (= 1)

Count stop condition

• A new count is reloaded after the count has reached 000016

• The count start flag is reset (= 0)

Interrupt request generation timing

The count reaches 000016

TA2OUT/TA3OUT pin function Programmable I/O port or pulse output

Read from timer

When timer Ai register is read, it indicates an indeterminate value

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)

Bit name

Timer Ai mode register

Symbol

Address

When reset

TAiMR(i = 0 to 4)

039616 to 039A16

0016

Function

Bit symbol

Operation mode select bit

1 0 : One-shot 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)

Reserved

bits

Must always be set to “0”

MR3

0 (Must always be “0” in one-shot timer mode)

0 0 : f1

0 1 : f8

1 0 : f32

1 1 : fC32

b7 b6

TCK1

TCK0

Count source select bit

MR2

Trigger select bit

0 : Count start flag is valid

1 : Selected by event/trigger select register

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 ”

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