7540 datasheet(150/366 Pages) RENESAS

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2-74

REJ09B0018-0200Z

Rev.2.00

Jun 21, 2004

APPLICATION

7540 Group

2.5 Timer Y and timer Z

Fig. 2.5.19 Setting method for timer mode

b7b0

Notes 1: For timer Z, f(XIN), f(XIN)/2, or timer Y underflow can be selected.

2: Set the on-chip oscillator oscillation to be enabled by bit 3 (on-chip oscillator

oscillation control bit) of CPU mode register.

b7b0

Note: In the timer mode, the timer Y secondary is not used.

b7b0

Process 1: Disable timer Y interrupt.

Process 2: Set timer Y, Z mode register.

Timer Y, Z mode register (TYZM) [Address 2016]

Process 4: Set the count value to timer Y.

• Set the count value to prescaler Y and timer Y primary

Count value

Timer Y primary (TYP) (Address 2316)

Process 5: In order not to execute the no requested interrupt processing,

set “0” (no requested) to the timer Y interrupt request bit.

Timer mode

Timer Y write control bit

0: Write to latch and timer simultaneously

1: Write to only latch

Timer Y count stop

Count value

Interrupt control register 2 (ICON2) [Address 3F16]

Timer Y interrupt disabled

Interrupt request register 2 (IREQ2) [Address 3D16]

Process 6: When timer Y interrupt is used, set “1” (interrupt enabled)

to the timer Y interrupt enable bit.

No timer Y interrupt request issued

Interrupt control register 2 (ICON2) [Address 3F16]

Timer Y interrupt enabled

Timer Y, Z mode register (TYZM) [Address 2016]

Timer Y count start

Process 7: Start counting of timer Y.

Process 3: Set timer Y count source (Note 1)

Timer count source set register (TCSS) [Address 2E16]

Timer Y count source selection bits

b3 b2

0 0 : f(XIN)/16

0 1 : f(XIN)/2

1 0 : On-chip oscillator output (Note 2)

1 1 : Not available

Prescaler Y (PREY) (Address 2116)

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