upd70f3017ay Renesas Electronics Corporation., upd70f3017ay Datasheet - Page 210

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

8.3 Watch Timer Control Register
(1) Watch timer mode control register (WTM)
210
The watch timer mode control register (WTM) controls the watch timer.
This register enables or disables the count clock and operation of the watch timer, sets the interval time of the
prescaler, controls the operation of the 5-bit counter, and sets the interrupt time of the watch timer.
WTNM is set by a 1-bit or 8-bit memory manipulation instruction.
RESET input clears WTM to 00H.
Remarks 1. f
After reset: 00H
WTM
2. Values in parentheses apply when f
W
Other than above
: Watch timer clock frequency (f
WTM7
WTM7
WTM6
WTM3
WTM1
WTM0
7
0
1
0
0
0
0
1
1
0
1
0
1
0
1
R/W
f
f
2
2
Clears after operation stops
Starts
Operation stopped (enabled both prescaler and timer cleared)
Operation
XX
XT
WTM6
WTM5
14
5
/f
/2
/f
(subclock)
W
6
0
0
1
1
0
0
W
9
(977
(main clock)
(0.5 s)
µ
s)
CHAPTER 8 WATCH TIMER
WTM5
WTM4
User’s Manual U12768EJ4V1UD
5
0
1
0
1
0
1
Address: FFFFF360H
Selection of Counter Clock of Watch Timer
Selection of Interrupt Time of Watch Timer
Control of Operation of 5-Bit Counter
2
2
2
2
2
2
Setting prohibited
XX
Watch Timer Operation Enable
WTM4
4
5
6
7
8
9
/f
/f
/f
/f
/f
/f
/2
W
W
W
W
W
W
W
4
9
= 32.768 kHz.
(3.91 ms)
(488
(977
(1.95 ms)
(7.81 ms)
(15.6 ms)
or f
Selection of Interval Time of Prescaler
XT
µ
µ
s)
s)
)
WTM3
3
2
0
WTM1
1
WTM0
0