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Rev. 5.00, 09/03, page 91 of 760
Exception Type Exception Event Exception Code
General interrupt requests External hardware interrupts (cont):
(cont)
IRL3–IRL0
= 0010 H'240
IRL3–IRL0
= 0011 H'260
IRL3–IRL0
= 0100 H'280
IRL3–IRL0
= 0101 H'2A0
IRL3–IRL0
= 0110 H'2C0
IRL3–IRL0
= 0111 H'2E0
IRL3–IRL0
= 1000 H'300
IRL3–IRL0
= 1001 H'320
IRL3–IRL0
= 1010 H'340
IRL3–IRL0
= 1011 H'360
IRL3–IRL0
= 1100 H'380
IRL3–IRL0
= 1101 H'3A0
IRL3–IRL0
= 1110 H'3C0
4.2.5 Exception Request Masks
When the BL bit in SR is 0, exceptions and interrupts are accepted.
If a general exception event occurs when the BL bit in SR is 1, the CPU’s internal registers are set
to their post-reset state, other module registers retain their contents prior to the general exception,
and a branch is made to the same address (H'A0000000) as for a reset.
If a general interrupt occurs when BL = 1, the request is masked (held pending) and not accepted
until the BL bit is cleared to 0 by software. For reentrant exception handling, SPC and SSR must
be saved and the BL bit in SR cleared to 0.
4.2.6 Returning from Exception Handling
The RTE instruction is used to return from exception handling. When RTE is executed, the SPC
value is set in PC, and the SSR value in SR, and the return from exception handling is performed
by branching to the SPC address.
If SPC and SSR have been saved in external memory, set the BL bit in SR to 1, then restore SPC
and SSR, and issue an RTE instruction.