M306V2 Mitsubishi, M306V2 Datasheet - Page 60
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M306V2
Manufacturer Part Number
M306V2
Description
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER
Manufacturer
Mitsubishi
Datasheet
1.M306V2.pdf
(276 pages)
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60
Figure 2.7.7 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, 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 2.7.7 shows the operation of the saving registers.
Note: Stack pointer indicated by U flag.
(1) Stack pointer (SP) contains even number
[SP] – 5 (Odd)
[SP] – 4 (Even)
[SP] – 2 (Even)
[SP] – 5 (Even)
[SP] – 3 (Even)
[SP] – 1 (Even)
[SP] – 3(Odd)
[SP] – 1(Odd)
[SP]
(2) Stack pointer (SP) contains odd number
[SP] – 4(Odd)
[SP] – 2(Odd)
[SP]
Note: [SP] denotes the initial value of the stack pointer (SP) when interrupt request is acknowledged.
Address
Address
(Odd)
After registers are saved, the SP content is [SP] minus 4.
(Even)
Flag register
Flag register
Program counter (PC
Program counter (PC
Program counter (PC
Program counter (PC
(FLG
(FLG
Flag register (FLG
Flag register (FLG
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
Stack area
Stack area
H
H
)
)
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
and ON-SCREEN DISPLAY CONTROLLER
MITSUBISHI MICROCOMPUTERS
M306V2ME-XXXFP
M306V2EEFP
Rev. 1.0
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