Renesas H8 Series - Page 618

Appendix B Internal I/O Registers
Rev. 7.00 Mar 10, 2005 page 576 of 652
REJ09B0042-0700
TCW—Timer Counter W H'B3 Watchdog Timer
Bit
Initial value
Read/Write
7
TCW7
0
R/W
6
TCW6
0
R/W
5
TCW5
0
R/W
3
TCW3
0
R/W
0
TCW0
0
R/W
2
TCW2
0
R/W
1
TCW1
0
R/W
4
TCW4
0
R/W
Count value
TMC—Timer Mode Register C H'B4 Timer C
Bit
Initial value
Read/Write
7
TMC7
0
R/W
6
TMC6
0
R/W
5
TMC5
0
R/W
3

1

0
TMC0
0
R/W
2
TMC2
0
R/W
1
TMC1
0
R/W
4

1

Clock Select
000
1
10
1
100
1
10
1
Internal clock: φ/8192
Internal clock: φ/2048
Internal clock: φ/512
Internal clock: φ/64
Internal clock: φ/16
Internal clock: φ/4
Internal clock: φ
W
/4
External event (TMIC):
rising or falling edge
Counter Up/Down Control
0 TCC is an up-counter
0
0
1 TCC is a down-counter
1 * Hardware control of TCC up/down operation by UD pin input
UD pin input high: Down-counter
UD pin input low: Up-counter
Auto-Reload Function Select
0 Interval timer function selected
1 Auto-reload function selected
*: Don't care