4513 datasheet(132/210 Pages) RENESAS

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APPLICATION

2.3 Timers

2-29

4513/4514 Group User’s Manual

(5)

Timer control register W3

The timer 3 count source selection bits are assigned to bits 0 and 1, the timer 3 count start synchronous

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

Set the contents of this register through register A with the TW3A instruction. The TAW3 instruction

can be used to transfer the contents of register W3 to register A.

Table 2.3.5 shows the timer control register W3.

Table 2.3.5 Timer control register W3

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

(6)

Timer control register W4

The timer 4 count source selection bits are assigned to bits 0 and 1, and the timer 4 control bit is

assigned to bit 3.

Set the contents of this register through register A with the TW4A instruction. The TAW4 instruction

can be used to transfer the contents of register W4 to register A.

Table 2.3.6 shows the timer control register W4.

Table 2.3.6 Timer control register W4

Timer control register W3

at reset : 00002

at RAM back-up : state retained

R/W

Stop (state retained)

Operating

Count start synchronous circuit not selected

Count start synchronous circuit selected

Count source

Timer 2 underflow signal

Prescaler output

Not available

Timer 3 control bit

Timer 3 count start synchronous

circuit control bit

Timer 3 count source selection

bits

W33

W32

W31

W30

W31

W30

Timer control register W4

at reset : 00002

at RAM back-up : state retained

R/W

Stop (state retained)

Operating

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

Count source

Timer 3 underflow signal

Prescaler output

CNTR1 input

Not available

Timer 4 control bit

Not used

Timer 4 count source selection

bits

W43

W42

W41

W40

W41

W40

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

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