Renesas R8C/15 Technical Information Seite 110

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R8C/14 Group, R8C/15 Group 13. Timers
Rev.2.10 Jan 19, 2006 Page 96 of 253
REJ09B0164-0210
Figure 13.9 TXMR Register in Pulse Period 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)
RW
[INT1]
_
_____
0 : Rising edge
1 : Falling edge
NOTES :
1.
2.
3. Refer to
20.4.2 Timer X
for precautions on the TXS bit.
This bit is set to “0” by w riting “0” in a program. (It remains unchanged even if w riting “1”)
RW
TXUND
(2)
RW
TXEDG
(2)
0 : Active edge not received
1 : Active edge received
Timer X underflow flag 0 : No underflow
1 : Underflow
RW
The IR bit in the INT1IC register may be set to “1” (requests interrupt) when the R0EDG bit is rewritten.
Refer to
20.2.5 Changing Interrupt Factor
.
b3 b2
TXS
Timer X Count Start Flag
(3)
b1 b0
TXMOD0
10
b7 b6 b5 b4
RW
TXOCNT RW
TXMOD2 1 : Pulse period measurement mode
Active Edge Reception Flag
0 : Stops counting
1 : Starts counting
Set to “0” in pulse width measurement mode
Operating Mode Select Bit 2
RW
Operating Mode Select Bit 0, 1
b1 b0
0 0 : Timer mode or pulse period measurement
mode
RW
R0EDG
[CNTR0]
0 : Measures measurement pulse from one
rising edge to next rising edge
1 : Measures measurement pulse from one
falling edge to next falling edge
00
TXMOD1
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