M16CSLASH26 datasheet(91/239 Pages) RENESAS

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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

f1, f2, 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

• An external trigger is input

• 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

TAiIN pin function

Programmable I/O port or trigger input

TAiOUT 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

• 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)

Table 1.12.4. Timer specifications in one-shot timer mode

Figure 1.12.12. Timer Ai mode register in one-shot timer mode

(3) One-shot timer mode

In this mode, the timer operates only once. (See Table 1.12.4.) When a trigger occurs, the timer starts

up and continues operating for a given period. Figure 1.12.12 shows the timer Ai mode register in

one-shot timer mode.

f1 or f2

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

0 : Pulse is not output

(TAiOUT pin is a normal port pin)

1 : Pulse is output (Note 1)

(TAiOUT pin is a pulse output pin)

MR2

MR1

MR3

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

0 0 :

0 1 : f8

1 0 : f32

1 1 : fC32

b7 b6

TCK1

TCK0

Count source select bit

0 : One-shot start flag is valid

1 : Selected by event/trigger select

bits

Trigger select bit

External trigger select

bit (Note 2)

0 : Falling edge of TAiIN pin's input signal (Note 3)

1 : Rising edge of TAiIN pin's input signal (Note 3)

Note 1: The settings of the corresponding port register and port direction register are invalid.

Note 2: Valid only when the TAiIN pin is selected by the event/trigger select bit

(addresses 038216 and 038316). If timer overflow is selected, this bit can be 1 or 0 .

Note 3: Set the corresponding port direction register to 0 .

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