Table of Contents
Advertisement
CHAPTER 3 CPU AND CONTROL UNITS
3.13
Watch Timer
The watch timer is a 15-bit free-run timer that performs incremental counting in
synchronization with the subclock. The watch timer has an interval timer function to
generate interrupts repeatedly at fixed time intervals.
The internal time can be selected from four types as follow.
■ Low-power Modes
1/F
CL
•
F
CL
114
Subclock cycle
(about 30.5 µs)
indicates the subclock oscillation frequency.
Interval time
10
2
F
(31.25ms)
CL
13
2
F
(0.25s)
CL
14
2
F
(0.50s)
CL
15
2
F
(1.00s)
CL
Advertisement
Table of Contents
