7630 datasheet(201/238 Pages) RENESAS

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3-30

7630 Group User’s Manual

APPENDIX

3.5 List of registers

Fig. 3.5.17 Structure of Timer XL, Timer XH, Timer YL, Timer YH

Fig. 3.5.18 Structure of Timer X mode register

Timer XL, Timer XH, Timer YL, Timer YH

b7 b6 b5 b4 b3 b2 b1 b0

Function

At reset

Timer XL (TXL), Timer XH (TXH) [Address : 001A16, 001B16]

Timer YL (TYL), Timer YH (TYH) [Address : 001C16, 001D16]

q Set “000016” to “FFFF16” as timer count value.

q Write access

The timer value is written to Timer X or Timer Y and latch at

the same timer or to the latch only (Note).

Write first low byte (TXL, TYL) and then high byte (TXH, TYH).

q Read access

To get the actual Timer X or Timer Y value read out the

corresponding timer register.

A measurement value is read out in pulse period and pulse

width measurement mode.

Read first high byte (TXH, TYH) and then low byte (TXL, TYL).

Note: Depinding on the Timer X or Timer Y data write control bit (bit 0 of the Timer X or

Timer Y mode register [address: 001E16, 001F16] ).

Timer X mode register

b7 b6 b5 b4 b3 b2 b1 b0

Function

At reset

Name

Timer X mode register (TXM) [Address : 001E16]

Timer X mode bits

Timer X stop control bit

b5 b4

0 0 : Timer mode

0 1 : Bi-phase counter mode

1 0 : Event counter mode

1 1 : Pulse width measurement mode

Not used (“0” when read, don't write “1”.)

Timer X data write control bit

0 : Data is written to latch and timer.

1 : Data is written to latch only.

0 : For event counter mode,

rising edge active

For interrupt request,

falling edge active

For pulse width measurement mode,

measure “H” period

1 : For event counter mode,

falling edge active

For interrupt request,

rising edge active

For pulse width measurement mode,

measure “L” period

CNTR0 polarity selection bit

0 : Timer counting

1 : Timer stopped

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