R8C datasheet(75/199 Pages) RENESAS

75 / 199 page

R8C/10 Group

Rev.1.20 Jan 27, 2006

page 65 of 180

REJ09B0019-0120

12.2 Timer Y

Timer Y is an 8-bit timer with an 8-bit prescaler and has two reload registers-Timer Y Primary and Timer

Y Secondary. Figure 12.11 shows a block diagram of Timer Y. Figures 12.12 to 12.14 show the TYZMR,

PREY, TYSC, TYPR, TYZOC, PUM, and YCSS registers.

The Timer Y has two operation modes as follows:

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

• Programmable waveform generation mode: The timer outputs pulses of a given width successively.

Figure 12.11 Timer Y Block Diagram

Figure 12.12 TYZMR Register

Toggle

flip-flop

Timer Y interrupt

INT2 interrupt

TYPR register

fRING

TYSC register

TYOCNT=1

TYOPL=1

TYOPL=0

P3_2 bit in P3 register

TYOCNT=0

TYMOD0=1

TYS=1

PREY register

INT2/CNTR1

TYCK1 to TYCK0

=002

=012

=102

=112

Counter

Reload register

Counter

Reload register

Peripheral data bus

Reload register

Polarity

switching

CLR

Write to TYZMR register

TYMOD0 bit=1

Timer Y, Z mode register

Symbol

Address

After reset

TYZMR

008016

0016

Bit name

Function

Bit symbol

b7 b6 b5 b4 b3 b2 b1 b0

0 0 : Timer mode

0 1 : Programmable waveform generation mode

1 0 : Programmable one-shot generation mode

1 1 : Programmable wait one-shot generation

mode

TZMOD1

TYS

TYWC

TYMOD0

TZMOD0

Timer Y operation

mode bit

Timer Y write

control bit

Function varies depending on the operation

mode

0 : Timer mode

1 : Programmable waveform generation mode

TZWC

TZS

0 : Stops counting

1 : Starts counting

0 : Stops counting

1 : Starts counting

Timer Z count

start flag

Timer Z operation

mode bit

b5 b4

Timer Y count

start flag

Timer Z write

control bit

Function varies depending on the operation

mode

R1EDG

0 : Rising edge

1 : Falling edge

INT2/CNTR1 polarity

switching bit(1)

NOTES:

1. The IR bit in the INT2IC register may be set to “1” (interrupt requested) when the R1EDG bit is rewritten.

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

12.2 Timer (Timer Y)

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