R8C/1A Group, R8C/1B Group 14. Timers
Rev.1.30 Dec 08, 2006 Page 117 of 315
REJ09B0252-0130
Figure 14.7 TXMR Register in Pulse Width Measurement Mode
Timer X Mode Register
Symbol Address After Reset
TXMR
008Bh 00h
Bit Symbol Bit Name Function RW
INT1
____
/CNTR0 signal
polarity sw itch bit
(1)
[INT1]
______
RW
0 : Rising edge
1 : Falling edge
NOTES :
1.
2.
11
The IR bit in the INT1IC register may be set to 1 (requests interrupt) w hen the R0EDG bit is rew ritten.
Refer to
12.5.5 Changing Interrupt Sources
.
R0EDG
RW
TXOCNT RW
TXMOD2 Set to 0 in pulse w idth measurement mode.
TXMOD0 RWOperating mode select bits 0, 1
b1 b0
1 1 : Pulse w idth measurement mode
TXMOD1 RW
b0
0000
b7 b6 b5 b4
Set to 0 in pulse w idth measurement mode.
RW
b3 b2
[CNTR0]
0 : Measures “L” level w idth
1 : Measures “H” level width
TXS
Timer X count start flag
(2)
0 : Stops counting.
1 : Starts counting.
b1
Refer to
14.1.6 Notes on Timer X
for precautions regarding the TXS bit.
Set to 0 in pulse w idth measurement mode.
Set to 0 in pulse w idth measurement mode.
RW
TXUND RW
TXEDG
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