Epson S1C6200A Dokumentacja Strona 194

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II-42 EPSON S1C62740 TECHNICAL SOFTWARE
CHAPTER 6: PERIPHERAL CIRCUITS (Stopwatch Timer)
Programming notes
(1) Be sure to data reading in the order of low-order data (SWL0–
SWL3) then high-order data (SWH0–SWH3).
(2) When the stopwatch timer has been reset, the interrupt factor
flag (ISW) may sometimes be set to "1". Consequently, perform
flag reading (reset the flag) as necessary at reset.
(3) Write the interrupt mask register (EISW) only in the DI status
(interrupt flag = "0"). Writing during EI status (interrupt flag =
"1") will cause malfunction.
(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 inter-
rupt 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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