6V7 datasheet(90/298 Pages) RENESAS

90 / 298 page

Rev.1.00

May 18, 2004

page 90 of 296

M306V7MG/MH/MJ/MJA-XXXFP, M306V7FG/FH/FJ/FJAFP

Item

Specification

Count source

f1, 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

• 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”

TA2OUT/TA3OUT 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 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)

(4) Pulse width modulation (PWM) mode

In this mode, the timer outputs pulses of a given width in succession. (See Table 2.10.4.) In this mode, the

counter functions as either a 16-bit pulse width modulator or an 8-bit pulse width modulator. Figure 2.10.14

shows the timer Ai mode register in pulse width modulation mode. Figure 2.10.15 shows the example of how

an 8-bit pulse width modulator operates.

Table 2.10.4 Timer specifications in pulse width modulation mode

Figure 2.10.14 Timer Ai mode register in pulse width modulation mode (i = 2 and 3)

Bit name

Timer Ai mode register

Symbol

Address

When reset

TAiMR(i=2 and 3)

039816 and 039916

0016

Function

Bit symbol

Operation mode

select bit

1 1 : PWM mode

b1 b0

TMOD1

TMOD0

MR0

Reserved bits

MR3

0 0 : f1

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

Must always be set to “0”

MR2

Trigger select bit

0: Count start flag is valid

1: Selected by event/trigger select register

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