S1C6S3N2 TECHNICAL SOFTWARE
EPSON
II-21
CHAPTER 4: INTERRUPT AND HALT
4.6 Programming Notes
(1) Even when the interrupt mask registers (ETI, EISWIT) are
set to "0", the interrupt factor flags (TI, SWIT) of the clock
timer and stopwatch counter can be set when the timing
conditions are established.
(2) When an interrupt is generated, three words of RAM are
used; also, it takes 12 cycles of the CPU system clock
until the value of the interrupt vector is set in the pro-
gram counter.
(3) When an interrupt occurs, the DI status (interrupt flag =
"0") comes into effect automatically.
(4) 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.
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