Specifications

S1C62N82 TECHNICAL SOFTWARE EPSON II-77
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
3.12.4.)
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
occured.
The flag is reset, when it is loaded by software. (See Figure
3.12.4.)
ISW1
ISW0
Reading of interrupt factor flags is available at EI, but be careful in
the following cases.
If the interrupt mask register value corresponding to the interrupt
factor flags to be read is set to 1, an interrupt request will be
generated by the interrupt factor flags set timing, or an interrupt
request will not be generated.
Be very careful when interrupt factor flags are in the same address.
Note
Fig. 3.12.4
Stopwatch interrupt
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