4501 datasheet(140/212 Pages) RENESAS

140 / 212 page

2.3 Timers

2-23

4501 Group

APPLICATION

Rev.2.01

Feb 07, 2005

REJ09B0192-0201

(3)

Timer control register W2

The timer 2 count source selection bits are assigned to bits 0 and 1, the timer 1 count auto-stop

circuit control bit is assigned to bit 2 and the timer 2 control bit is assigned to bit 3.

Set the contents of this register through register A with the TW2A instruction. The TAW2 instruction

can be used to transfer the contents of register W2 to register A.

Table 2.3.3 shows the timer control register W2.

Table 2.3.3 Timer control register W2

Timer control register W2

at reset : 00002

at RAM back-up : state retained

R/W

Stop (state retained)

Operating

Count auto-stop circuit not selected

Count auto-stop circuit selected

Count source

Timer 1 underflow signal

Prescaler output (ORCLK)

CNTR input

System clock

Timer 2 control bit

Timer 1 count auto-stop circuit

control bit (Note 2)

Timer 2 count source selection

bits

W23

W22

W21

W20

Notes 1: “R” represents read enabled, and “W” represents write enabled.

2: This function is valid only when the timer 1 count start synchronous circuit is selected.

(4)

Timer control register W6

The P12/CNTR function selection bit is assigned to bit 0 and the CNTR output control bit is assigned

to bit 1.

Set the contents of this register through register A with the TW6A instruction. The TAW6 instruction

can be used to transfer the contents of register W6 to register A.

Table 2.3.4 shows the timer control register W6.

Table 2.3.4 Timer control register W6

W21

W20

Timer control register W6

at reset : 00002

at RAM back-up : state retained

R/W

This bit has no function, but read/write is enabled.

Timer 1 underflow signal divided by 2 output

Timer 2 underflow signal divided by 2 output

P12 (I/O) / CNTR input (Note 2)

P12 (input) / CNTR I/O (Note 2)

Not used

CNTR output control bit

P12/CNTR function selection bit

W63

W62

W61

W60

Notes 1: “R” represents read enabled, and “W” represents write enabled.

2: The CNTR input is valid only when the CNTR input is selected for the timer 2 count source.

3: When timer is used, W63 and W62 are not used.

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