M16CSLASH1N datasheet(94/238 Pages) RENESAS

94 / 238 page

Rev.1.00

Oct 20, 2004

page 82 of 222

M16C/1N Group

12. Timers

REJ09B0007-0100Z

12.3 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.

Timer Y has the two operation modes listed as follows:

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

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

Figure 12.13 shows the block diagram of Timer Y. Figures 12.14 to 12.16 show the Timer Y-related

registers.

Timer Y primary

(address 008316)

Clock source

selection

fRING

fC32

Toggle flip-flop

Port P32 register

Timer Y programmable

waveform output

switching bit

Timer Y output

level latch

Programmable waveform

generation mode

Timer Y count

start flag

Timer Y (address 008316)

Timer Y interrupt

request bit

TYOUT

"1"

"0"

Timer Y secondary

(address 008216)

Counter (8)

Reload register (8)

Counter (8)

Reload register (8)

Prescaler Y (address 008116)

fPY

Peripheral data bus

Note 1: In programmable waveform generation mode, port P32 is set for output regardless of the value of the direction

Note 2: When this bit is cleared to "0", the timer reloads the content of the reload register before it stops. Read out the

count value before you stop the timer.

Note 3: When timer Z operation mode bit is set for "01", "10" or "11", port P31 is set for output regardless of the value of

the direction register.

b5 b4

Timer Y, Z mode register

TYMOD0

Timer Y operation

mode bit

0 : Timer mode

1 : Programmable waveform generation mode

(Note 1)

Nothing is assigned.

When write, set "0". When read, the content is "0".

TYWC

Timer Y write

control bit

Function varies depending on

the operation mode

TYS

Timer Y count

start flag

0 : Stops counting (Note 2)

1 : Starts counting

TZMOD0

Timer Z operation

mode bit (Note 3)

TZMOD1

TZWC

Timer Z write

control bit

Function varies depending on

the operation mode

TZS

Timer Z count

start flag

0 : Stops counting (Note 2)

1 : Starts counting

Symbol

TYZMR

Address

008016

When reset

000000X02

Function

Bit name

Bit symbol

b5 b4

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

Figure 12.13 Block diagram of Timer Y

Figure 12.14 Timer Y-related registers (1)

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