7540 datasheet(159/366 Pages) RENESAS

159 / 366 page

2-83

REJ09B0018-0200Z

Rev.2.00

Jun 21, 2004

7540 Group

APPLICATION

2.5 Timer Y and timer Z

Fig. 2.5.27 Example of control procedure

“0016”

“2016”

RESET

Processing

CLI

Timer Y primary waveform

generation extended (Note 3)

Timer Y secondary waveform

generation extended (Note 3)

Initial state: “L”, TYP: “H” interval,

TYS: “L” interval

PUM(Address 2416)

“4116”

TCSS(Address 2E16)

Timer Y count source:

f(XIN)/2 selected

Set port P01 to the output mode.

Set “0” to the timer Y interrupt enable bit.

(Timer Y interrupt disabled)

Prescaler Y (Address 2116)

Set value to timer Y (Notes 3, 4, 5, 6)

Set timer count source set register

TYZM(Address 2016)

Set timer Y, Z mode register

Programmable waveform

generation mode

Writing to only latch (Note 2)

Timer Y count stop

Timer Y primary (Address 2316)

Set “1” to the timer Y interrupt enable bit.

(Timer Y interrupt enabled)

Set “0” to the timer Y interrupt request bit.

TYZM(Address 2016)

Set timer Y, Z mode register

Timer Y count start

Initialization

SEI

CLD

CLT

CPUM(Address 3B16)

← 10000X002

Wait until f(XIN) oscillation is stabilized (Note 1)

CPUM(Address 3B16)

← 00000X002

X: This bit is not used here. Set it to “0” or “1” arbitrary.

Timer Y secondary (Address 2216)

Set timer Y, Z waveform output control register

Notes 1: For the concrete time, ask the oscillator manufacture.

2: When using this mode, be sure to select “write to latch

only”.

3: The waveform extension function by the timer Y waveform

extension control bits can be used only when “0016” is set

to prescaler Y.

When the value other than “0016” is set to prescaler Y, be

sure to set “0” to EXPYP and EXPYS.

4: In the programmable waveform generation mode, values of

TYS, EXPYP, and EXPYS are valid by writing to TYP. Even

when changing TYP is not required, write the same value

again.

5: In the programmable waveform generation mode, when the

setting value is changed while the waveform is output, set

by software in order not to execute the writing to TYP and

the timing of timer Y underflow during the secondary

interval simultanesously.

6: Count values of the primary interval and secondary interval

can be checked by reading TYP (TYS is undefined at read).

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