I-88
EPSON
S1C6S3N2 TECHNICAL HARDWARE
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Interrupt and HALT)
4.13 Interrupt and HALT
The S1C6S3N2 Series provides the following interrupt set-
tings, each of which is maskable.
External interrupt :
Input interrupt (two)
Internal interrupt :
Timer interrupt (three)
Stopwatch interrupt (two)
To authorize interrupt, the interrupt flag must be set to "1"
(EI) and the necessary related interrupt mask registers must
be set to "1" (enable).
When an interrupt occurs the interrupt flag is automatically
reset to "0" (DI), and interrupts after that are inhibited.
When a HALT instruction is input the CPU operating clock
stops, and the CPU enters the HALT status.
The CPU is reactivated from the HALT status when an
interrupt request occurs.
If reactivation is not caused by an interrupt request, initial
reset by the watchdog timer causes reactivates the CPU
(when the watchdog timer is enabled).
Figure 4.13.1 shows the configuration of the interrupt
circuit.
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