M30201 datasheet(49/172 Pages) RENESAS

49 / 172 page

Mitsubishi microcomputers

M30201 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Timer A

Figure 1.37 shows the block diagram of timer A. Figures 1.38 to 1.40 show the timer A-related registers.

Use the timer A0 mode register bits 0 and 1 to choose the desired mode.

Timer A has the four operation modes listed as follows:

• Timer mode: The timer counts an internal count source.

• Event counter mode: The timer counts pulses from an external source or a timer over flow.

• One-shot timer mode: The timer stops counting when the count reaches “000016”.

• Pulse width modulation (PWM) mode: The timer outputs pulses of a given width.

Figure 1.38. Timer A-related registers (1)

Figure 1.37. Block diagram of timer A

Count start flag

Up count/down count

Always down count except

in event counter mode

Reload register (16)

Counter (16)

Low-order

8 bits

High-order

8 bits

Clock source

selection

• Timer

(gate function)

• Timer

• One shot

• PWM

f32

External

trigger

TA0IN

TB1 overflow

• Event counter

fC32

Clock selection

TX0 overflow

Pulse output

Toggle flip-flop

TA0OUT

Data bus low-order bits

Data bus high-order bits

Up/down flag

Down count

TX2 overflow

Polarity

selection

Timer A0 mode register

Symbol

Address

When reset

TA0MR

039616

0016

Bit name

Function

Bit symbol

b4 b3

0 0 : Timer mode

0 1 : Event counter mode

1 0 : One-shot timer mode

1 1 : Pulse width modulation

(PWM) mode

b1 b0

TCK1

MR3

MR2

MR1

TMOD1

MR0

TMOD0

TCK0

Function varies with each operation mode

Count source select bit

(Function varies with each operation mode)

Operation mode select bit

M30201 Datasheet(PDF) 49 Page - Renesas Technology Corp

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