Exception Processing Vectors - Epson S1C88655 Technical Manual

7.5 Exception Processing Vectors

When the CPU accepts an interrupt request, it starts
exception processing following completion of the
instruction being executed. In exception processing,
the following operations branch the program.
(1) In the minimum mode, the program counter
(PC) and system condition flag (SC) are moved
to stack and in the maximum mode, the code
bank register (CB), PC and SC are moved.
(2) The branch destination address is read from the
exception processing vector corresponding to
each exception processing (interrupt) factor and
is placed in the PC.
An exception vector is 2 bytes of data in which the
top address of each exception (interrupt) processing
routine has been stored and the vector addresses
correspond to the exception processing factors as
shown in Table 7.5.1.
Note: 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 top portion of an exception
processing routine must be described within the
common area (000000H–007FFFH).
S1C88655 TECHNICAL MANUAL
7 INTERRUPT AND STANDBY STATUS
Table 7.5.1 Vector address and exception
processing correspondence
Vector
Exception processing factor
address
000000H Reset
000002H Zero division
000004H Watchdog timer (NMI)
000006H P27 input interrupt
000008H P26 input interrupt
00000AH P25 input interrupt
00000CH P24 input interrupt
00000EH P23 input interrupt
000010H P22 input interrupt
000012H P21 input interrupt
000014H P20 input interrupt
000016H PTM 3 compare match interrupt
000018H PTM 3 underflow interrupt
00001AH PTM 2 compare match interrupt
00001CH PTM 2 underflow interrupt
00001EH PTM 1 compare match interrupt
000020H PTM 1 underflow interrupt
000022H PTM 0 underflow interrupt
000024H PTM 0 compare match interrupt
000026H Serial I/F 0 error interrupt
000028H Serial I/F 0 receiving complete interrupt
00002AH Serial I/F 0 transmitting complete interrupt
00002CH Serial I/F 1 error interrupt
00002EH Serial I/F 1 receiving complete interrupt
000030H Serial I/F 1 transmitting complete interrupt
000032H Clock timer 32 Hz interrupt
000034H Clock timer 8 Hz interrupt
000036H Clock timer 2 Hz interrupt
000038H Clock timer 1 Hz interrupt
00003AH PTM 7 compare match interrupt
00003CH PTM 7 underflow interrupt
00003EH PTM 6 compare match interrupt
000040H PTM 6 underflow interrupt
000042H PTM 5 compare match interrupt
000044H PTM 5 underflow interrupt
000046H PTM 4 compare match interrupt
000048H PTM 4 underflow interrupt
00004AH System reserved (cannot be used)
00004CH
: Software interrupt
0000FEH
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