R8C13 datasheet(82/224 Pages) RENESAS

82 / 224 page

Rev.1.20

Jan 27, 2006

page 71 of 205

REJ09B0111-0120

R8C/13 Group

TXCK1 to TXCK0

=002

f32

Toggle flip-flop

Polarity

switching

TXOCNT bit

CNTR0

R0EDG=0

CLR

TXMOD1 to TXMOD0 bits=012

Counter

Reload register

Counter

Reload register

TXS bit

PREX register

TX register

Write to TX register

Timer X interrupt

Data bus

INT1 interrupt

INT1/CNTR0

R0EDG =1

TXMOD1 to TXMOD0 bits=012

=012

=102

=112

TXMOD1 to TXMOD0

=002 or 012

=102

=112

Figure 12.1 Timer X Block Diagram

Timer X mode register

Symbol

Address

After reset

TXMR

008B16

0016

Bit name

Function

Bit symbol

b7 b6 b5 b4 b3 b2 b1 b0

0 0 : Timer mode or

pulse period measurement mode

0 1 : Pulse output mode

1 0 : Event counter mode

1 1 : Pulse width measurement mode

b1 b0

TXMOD2

TXS

TXMOD1

R0EDG

TXMOD0

TXOCNT

INT1/CNTR0

polarity switching

bit(1)

Operation mode

select bit 0, 1

Timer X count

start flag

0 : Stops counting

1 : Starts counting

P30/CNTR0

select bit

Operation mode

select bit 2

0 : Except in pulse period measurement mode

1 : Pulse period measurement mode

Function varies with each operation mode

TXEDG

TXUND

Timer X under

flow flag

Function varies depending on each

operation mode.

Active edge

reception flag

Function varies depending on each

operation mode.

Function varies with each operation mode

NOTES:

1. The IR bit in the INT1IC register may be set to “1” (interrupt requested) when the R0EDG bit is rewritten.

Refer to the paragraph 19.2.5 “Changing Interrupt Factor” in the Usage Notes Reference Book.

Figure 12.2 TXMR Register

12.1 Timer X

The Timer X is an 8-bit timer with an 8-bit prescaler. Figure 12.1 shows the block diagram of Timer X.

Figures 12.2 and 12.3 show the Timer X-related registers.

The Timer X has five operation modes listed as follows:

• Timer mode:

The timer counts an internal count source .

• Pulse output mode:

The timer counts an internal count source and outputs the pulses

whose polarity is inverted at the timer the timer underflows.

• Event counter mode:

The timer counts external pulses.

• Pulse width measurement mode: The timer measures an external pulse's pulse width.

• Pulse period measurement mode:The timer measures an external pulse's period.

12.1 Timer (Timer X)

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