Datasheet

V850ES/JG3 CHAPTER 10 WATCH TIMER FUNCTIONS
R01UH0015EJ0300 Rev.3.00 Page 385 of 870
Sep 30, 2010
10.2 Configuration
The block diagram of the watch timer is shown below.
Figure 10-1. Block Diagram of Watch Timer
Internal bus
Watch timer operation mode register
(WTM)
f
BRG
f W /2
4
f W /2
5
f W /2
6
f W /2
7
f W /2
8
fW/2
10
fW/2
11
f W /2
9
f XT
11-bit prescaler
Clear
Clear
INTWT
INTWTI
WTM0WTM1WTM2WTM3WTM4WTM5WTM6WTM7
5-bit counter
f
W
3
f X
f X /8
f
X /4
f
X /2
f
X
BGCS00BGCS01BGCE0
3-bit
prescaler
8-bit counter
Clear
Match
f BGCS
PRSM0 register
PRSCM0 register
1/2
2
Internal bus
Clock
control
Selector
Selector
Selector
Selector
Selector
Remark f
X: Main clock oscillation frequency
f
BGCS: Watch timer source clock frequency
fBRG: Watch timer count clock frequency
f
XT: Subclock frequency
f
W: Watch timer clock frequency
INTWT: Watch timer interrupt request signal
INTWTI: Interval timer interrupt request signal