M30201 datasheet(73/172 Pages) RENESAS

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Mitsubishi microcomputers

M30201 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Timer X

Item

Specification

f1, f8, f32, fC32

• Down counts (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

• "H" level width n / fi

n : Set value

• Cycle time

(216-1) / fi fixed

• "H" level width n (m+1)/ fi n:values set to timer Xi register’s high-order address

• Cycle time (28-1) (m+1) / fi m : values set to timer Xi register’s low-order address

• The timer overflows

• The count start flag is set (= 1)

• The count start flag is reset (= 0)

• Set value of "H" level width is except FF16, 0016 : PWM pulse goes “L”

• Set value of "H" level width is FF16, 0016 : Timing that count value goes to 0116

• Set value of "H" level width is except FFFF16, 000016 : PWM pulse goes “L”

• Set value of "H" level width is FFFF16, 000016 : Timing that count value goes to 000116

Pulse output

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

• When counting stopped

When a value is written to timer Xi register, it is written to both reload register and counter

• When counting in progress

When a value is written to timer Xi register, it is written to only reload register

(Transferred to counter at next reload time)

(5) Pulse width modulation (PWM) mode

In this mode, the timer outputs pulses of a given width in succession. (See Table 1.24.) In this mode, the counter

functions as either a 16-bit pulse width modulator or an 8-bit pulse width modulator. Figure 1.66 shows the timer

Xi mode register in pulse width modulation mode. Figure 1.67 shows the example of how a 16-bit pulse width

modulator operates. Figure 1.68 shows the example of how an 8-bit pulse width modulator operates.

Figure 1.66. Timer Xi mode register in pulse width modulation mode

Table 1.24. Timer specifications in pulse width modulation mode

Bit name

Function

Bit symbol

Operation mode

select bit

1 1 : PWM mode

b1 b0

TMOD1

TMOD0

MR0

MR2

MR1

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

Trigger select bit

0: Count start flag is valid

1: Selected by event/trigger select register

Note 1: TXiINOUT pin inout cannot be selected by the event/trigger select bit(addresses 038316).

Note 2: Set the corresponding port direction register to “1” (output mode).

Timer Xi mode register

Symbol

Address

When reset

TXiMR(i = 0 to 2) 039716 to 039916

0016

b7 b6

b1 b0

Invalid in PWM mode. Can be “0” or “1”.

(Note 1)

Count source

Count operation

16-bit PWM

8-bit PWM

Count start condition

Count stop condition

8 bits PWM

16 bits PWM

TXiINOUT pin function

Read from timer

Write to timer

Interrupt

request

generation

timing

Note: When set value of "H" level width is 0016 or 000016, pulse outputs "L" level and inversion value, FF16 or FFFF16 is set to timer.

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