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5 PERIPHERAL CIRCUITS AND THEIR OPERATION (System Controller and Bus Control)
5.2.7 Programming notes
(1)
All the interrupts including NMI are masked,
until you write the optional value into both the
"00FF00H" and "00FF01H" addresses. Conse-
quently, even if you do not change the content
of this address (You use the initial value, as is.),
you should still be sure to perform the writing
operation using the initialization routine.
(2) When setting stack fields, including page
addresses as well, you should write them in the
order of the register SPP ("00FF01H") and the
stack pointer SP.
Example: When setting the "178000H" address
LD
EP, #00H
LD
HL, #0FF01H
LD
[HL], #17H
LD
SP, #8000H
38
______
During this period the
interrupts (including
_______
NMI) are masked.
EPSON
S1C88650 TECHNICAL MANUAL
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