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User’s Manual U13850EJ6V0UD
253
CHAPTER 8 WATCH TIMER
8.1 Function
The watch timer has the following functions.
• Watch timer
• Interval timer
The watch timer and interval timer functions can be used at the same time.
Figure 8-1. Block Diagram of Watch Timer
Internal bus
Watch timer mode control register
(WTNM)
f
XX
f
W
/2
4
f
W
/2
5
f
W
/2
6
f
W
/2
7
f
W
/2
8
f
W
/2
10
f
W
/2
11
f
W
/2
9
f
XT
4
11-bit prescaler
Clear
Clear
INTWTN
INTWTNI
WTNM0
WTNM1
WTNM2
WTNM3
WTNM4
WTNM5
WTNM6
WTNM7
Watch timer clock selection
register (WTNCS)
WTNCS0
WTNCS1
Watch timer high-speed clock selection
register (WTNHC)
WTNCS2
5-bit counter
f
W
Selector
Selector
Selector
Selector
Caution
The WTNHC register is available only in the B versions of the V850/SB1,
µµµµ
PD703036H,
703036HY, 703037H, 703037HY, 70F3036H, 70F3036HY, 70F3037H, and 70F3037HY.
Remark
f
XX
: Main clock frequency
f
XT
:
Subclock frequency
f
W
:
Watch timer clock frequency
Содержание V850/SB1
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