Specifications

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

Address 0EAH

Stopwatch interrupt

mask register (EISW)

Stopwatch interrupt

factor flag (ISW)

INT

(Interrupt request)

Interrupt flag (I)

Data bus

Stopwatch

timer

10 Hz

1 Hz

Address 0EEH