upd70f3017ay Renesas Electronics Corporation., upd70f3017ay Datasheet - Page 208

• Manufacturer Part Number: upd70f3017ay
• Description: V850/sa1tm 32-/16-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

8.1 Functions
208
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.
The block diagram of the watch timer is shown below.
Caution The value of the 5-bit counter cannot be read or written.
Remark
f
f
XX
XT
/2
9
f
f
f
XX
XT
W
: Watch timer clock frequency
: Main clock frequency
: Subclock frequency
f
W
f
W
/2
4
f
W
/2
5
9-bit prescaler
Figure 8-1. Block Diagram of Watch Timer
f
W
/2
6
CHAPTER 8 WATCH TIMER
f
W
/2
Clear
7
User’s Manual U12768EJ4V1UD
f
W
WTM7 WTM6 WTM5 WTM4 WTM3 WTM1 WTM0
/2
8
f
W
/2
Internal bus
9
Watch timer mode
control register (WTM)
5-bit counter
Clear
INTWT
INTWTI