CHAPTER 8 WATCH TIMER
User’s Manual U13850EJ6V0UD
257
(3) Watch timer clock selection register (WTNCS)
This register selects the count clock of the watch timer.
WTNCS is set using an 8-bit memory manipulation instruction.
RESET input clears WTNCS to 00H.
Caution
Do not change the contents of the WTNM, WTNHC, and WTNCS registers (interval time, watch
timer interrupt time, count clock) during a watch timer operation.
0
f
XX
/2
7
f
XT
(subclock)
f
XX
/3
×
2
6
f
XX
/2
8
Setting prohibited
Setting prohibited
f
XX
/3
×
2
7
f
XX
/2
9
f
XX
/3
2
×
2
6
Setting prohibited
Other than above
WTNCS2
Note
0
0
0
0
0
0
0
0
1
Selection of count clock
4.194 MHz
–
6.291 MHz
8.388 MHz
–
–
12.582 MHz
16.777 MHz
18.874 MHz
–
Main clock frequency
WTNCS
0
0
0
0
0
WTNCS1 WTNCS0
WTNCS1
0
0
0
0
1
1
1
1
0
WTNCS0
0
0
1
1
0
0
1
1
1
WTNM7
0
1
0
1
0
1
0
1
0
After reset: 00H R/W Address: FFFFF364H
Note
The WTNCS2 bit is available only in the B versions of the V850/SB1,
µ
PD703036H,
703036HY, 703037H, 703037HY, 70F3036H, 70F3036HY, 70F3037H, and 70F3037HY.
Remark
WTNM7 is bit 7 of the WTNM register.
Содержание V850/SB1
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