Rts Instruction; Sleep Instruction - Renesas Hitachi H8S/2194 Series Hardware Manual

27.3.7

RTS Instruction

When the trap address is the next instruction to the RTS instruction, transition is made to the
address trap interrupt after reading the CCR and PC from the stack and prefetching the
instruction at the return location. The address to be stacked is 0298.
RTS
instruc-
tion
pre-fetch
Address bus
02AC
Break interrupt
request signal
27.3.8

SLEEP Instruction

(1) SLEEP Instruction 1
When the trap address is the SLEEP instruction and the instruction execution cycle
immediately preceding the SLEEP instruction is that of 2 states or more and prefetch does
not occur in the last state, the SLEEP instruction is not executed and transition is made to the
address trap interrupt without going into SLEEP mode. The address to be stacked is 0274.
MOV
instruc-
tion
pre-fetch
Address bus
0272
Interrupt
request
signal
Rev. 2.0, 11/00, page 604 of 1037
Internal
NOP Stack
opera-
instruc-
storing
tion
tion
pre-fetch
02AE SP SP+2 SP
RTS execution
Figure 27.15 RTS Instruction
Data
SLEEP NOP
instruc- instruc-
write
tion tion
pre-fetch pre-fetch
0274 FFF9 0276
MOV SLEEP
execution cancel
Figure 27.16 SLEEP Instruction (1)
NOP
Start of
instruc-
exception
tion
handling
pre-fetch
0298 029A
Start of
exception
handling
SP-2 SP-4
0296 BSR SUB
0298 NOP
029A NOP
:
02AC
* 02AE
* Trap setting address
The underlines address is the
one to be actually stacked.
0272 MOV.B R2L, @FFF8
*
0274 SLEEP
0276 NOP
0278 NOP
: :
* Trap setting address
The underlines address is the
one to be actually stacked.
:
RTS
NOP