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II-56 EPSON S1C6S2N7 TECHNICAL SOFTWARE
CHAPTER 3: PERIPHERAL CIRCUITS (Interrupt and Halt)
This flag is set to "1" when a falling edge is detected in the
stopwatch timer (SWH, 1 Hz).
The contents of the ISW1 flag can be loaded by software to
determine whether a 1 Hz stopwatch interrupt has occured.
The flag is reset, when it is loaded by software. (See Figure
3.10.3.)
This flag is set to "1" when a falling edge is detected in the
stopwatch timer (SWH, 10 Hz).
The contents of the ISW0 flag can be loaded by software to
determine whether a 10 Hz stopwatch interrupt has oc-
cured.
The flag is reset, when it is loaded by software. (See Figure
3.10.3.)
ISW1
ISW0
Fig. 3.10.3
Stopwatch interrupt circuit
D0
D1
D0
D1
Address 0EAH
Stopwatch interrupt
mask register (EISW)
Stopwatch interrupt
factor flag (ISW)
INT
(Interrupt request)
Interrupt flag (I)
Data bus
Data bus
Stopwatch
timer
10 Hz
1 Hz
Address 0EEH
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