m30262f8gp Renesas Electronics Corporation., m30262f8gp Datasheet - Page 62
m30262f8gp
Manufacturer Part Number
m30262f8gp
Description
Renesas 16-bit Cmos Single-chip Microcomputer M16c Family / M16c/20 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.M30262F8GP.pdf
(239 pages)
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Interrupts
56
Figure 1.9.7. Operation of saving registers
The operation of saving registers carried out in the interrupt sequence is dependent on whether the
content of the stack pointer (Note) , at the time of acceptance of an interrupt request, is even or odd. If
the content of the stack pointer (Note) is even, the content of the flag register (FLG) and the content of the
program counter (PC) are saved, 16 bits at a time. If odd, their contents are saved in two steps, 8 bits at
a time. Figure 1.9.7 shows the operation of the saving registers.
Note: When any INT instruction in software numbers 32 to 63 has been executed, this is the stack pointer
indicated by the U flag. Otherwise, it is the interrupt stack pointer (ISP).
Preliminary Specifications Rev. 0.9
Specifications in this manual are tentative and subject to change.
[SP]
[SP] - 5 (Odd)
[SP] - 4 (Even)
[SP] - 3 (Odd)
[SP] - 2 (Even)
[SP] - 1 (Odd)
[SP]
[SP] - 5 (Even)
[SP] - 4 (Odd)
[SP] - 3 (Even)
[SP] - 2 (Odd)
[SP] - 1 (Even)
(1) Stack pointer (SP) contains even number
(2) Stack pointer (SP) contains odd number
Note: [SP] denotes the initial value of the stack pointer (SP) when interrupt request is acknowledged.
Address
Address
(Odd)
(Even)
After registers are saved, the SP content is [SP] minus 4.
Flag register
Flag register
Program counter (PC
Program counter (PC
Program counter (PC
Program counter (PC
(FLG
(FLG
Flag register (FLG
Flag register (FLG
Stack area
Stack area
H
H
)
)
Renesas Technology Corp.
counter (PC
counter (PC
Program
Program
L
L
)
)
M
M
L
L
)
)
)
)
H
H
)
)
Sequence in which order
registers are saved
Sequence in which order
registers are saved
Finished saving registers
in two operations.
(3)
(4)
(1)
(2)
(2) Saved simultaneously,
(1) Saved simultaneously,
Finished saving registers
in four operations.
all 16 bits
all 16 bits
Saved simultaneously,
all 8 bits
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
M16C/26 Group
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