Epson S1C88650 - Manual (Page 143)

S1C88650 TECHNICAL MANUAL EPSON 135
5 PERIPHERAL CIRCUITS AND THEIR OPERATION (Interrupt and Standby Status)
Refer to the explanations on the respective peripheral circuits for the setting content and control method for each bit.
5.14.7 Programming notes
(1) When executing the RETE instruction without
resetting the interrupt factor flag after an
interrupt has been generated, the same interrupt
will be generated. Consequently, the interrupt
factor flag corresponding to that routine must
be reset (writing "1") in the interrupt processing
routine.
(2) Beware. If the interrupt flags (I0 and I1) have
been rewritten (set to lower priority) prior to
resetting an interrupt factor flag after an
interrupt has been generated, the same interrupt
will be generated again.
(3) An exception processing vector is fixed at 2
bytes, so it cannot specify a branch destination
bank address. Consequently, to branch from
multiple banks to a common exception process-
ing routine, the front portion of an exception
processing routine must be described within the
common area (000000H–007FFFH).
(4) Do not execute the SLP instruction for 2 msec
after a NMI interrupt has occurred (when f OSC1
is 32.768 kHz).
Table 5.14.6.1(c) Interrupt control bits
SR R/W Address Bit Name Function Comment 1 0
00FF29 D7
D6
D5
D4
D3
D2
D1
D0
FTC3
FTU3
FTC2
FTU2
FTC1
FTU1
FTC0
FTU0
PTM3 compare match interrupt factor flag
PTM3 underflow interrupt factor flag
PTM2 compare match interrupt factor flag
PTM2 underflow interrupt factor flag
PTM1 compare match interrupt factor flag
PTM1 underflow interrupt factor flag
PTM0 compare match interrupt factor flag
PTM0 underflow interrupt factor flag
0 R/W
(R)
No interrupt
factor is
generated
(W)
No operation
00FF2E D7
D6
D5
D4
D3
D2
D1
D0
FTC7
FTU7
FTC6
FTU6
FTC5
FTU5
FTC4
FTU4
PTM7 compare match interrupt factor flag
PTM7 underflow interrupt factor flag
PTM6 compare match interrupt factor flag
PTM6 underflow interrupt factor flag
PTM5 compare match interrupt factor flag
PTM5 underflow interrupt factor flag
PTM4 compare match interrupt factor flag
PTM4 underflow interrupt factor flag
0 R/W
(R)
Interrupt
factor is
generated
(W)
Reset
(R)
Interrupt
factor is
generated
(W)
Reset
(R)
No interrupt
factor is
generated
(W)
No operation