M16CSLASH26 datasheet(92/239 Pages) RENESAS

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Renesas Technology Corp.

Timer A

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.

(4) Pulse width modulation (PWM) mode

In this mode, the timer outputs pulses of a given width in succession. (See Table 1.12.5.) In this mode, the

counter functions as either a 16-bit pulse width modulator or an 8-bit pulse width modulator. Figure 1.12.13

shows the timer Ai mode register in pulse width modulation mode. Figure 1.12.14 shows the example of

how a 16-bit pulse width modulator operates. Figure 1.12.15 shows the example of how an 8-bit pulse width

modulator operates.

Figure 1.12.13. Timer Ai mode register in pulse width modulation mode

Table 1.12.5. Timer specifications in pulse width modulation mode

Item

Specification

Count source

f1, f2, f8, f32, fC32

Count operation

• The timer counts down (operating as an 8-bit or a 16-bit pulse width modulator)

• The timer reloads a new count at a rising edge of PWM pulse and continues counting

• The timer is not affected by a trigger that occurs when counting

16-bit PWM

High level width

n / fi

n : Set value

• Cycle time(216-1) / fi fixed

8-bit PWM

• High level width

n (m+1) / fi

n : values set to timer Ai register’s high-order address

• Cycle time

(28-1)

(m+1) / fi

m : values set to timer Ai register’s low-order address

Count start condition

• External trigger is input

• The timer overflows

• The count start flag is set (= 1)

Count stop condition

• The count start flag is reset (= 0)

Interrupt request generation timing

PWM pulse goes “L”

TAiIN pin function

Programmable I/O port or trigger input

TAiOUT pin function

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)

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 1 : PWM mode

b1 b0

TMOD1

TMOD0

MR0

MR2

MR1

MR3

0 0 :

0 1 : f8

1 0 : f32

1 1 : fC32

b7 b6

TCK1

TCK0

Count source select bit

1 (Must always be 1 in PWM mode)

16/8-bit PWM mode

select bit

0: Functions as a 16-bit pulse width modulator

1: Functions as an 8-bit pulse width modulator

Trigger select bit

External trigger select

bit (Note 1)

0: Falling edge of TAiIN pin's input signal (Note 2)

1: Rising edge of TAiIN pin's input signal (Note 2)

0: Count start flag is valid

1: Selected by event/trigger select bits

Note 1: 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 2: Set the corresponding port direction register to 0 .

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