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M306V5ME-XXXSP Datasheet(PDF) 49 Page - Mitsubishi Electric Semiconductor

Part No. M306V5ME-XXXSP
Description  SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER
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Maker  MITSUBISHI [Mitsubishi Electric Semiconductor]
Homepage  http://www.mitsubishichips.com
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M306V5ME-XXXSP Datasheet(HTML) 49 Page - Mitsubishi Electric Semiconductor

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M306V5ME-XXXSP
M306V5EESP
MITSUBISHI MICROCOMPUTERS
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
49
Rev. 1.0
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.
Figure 2.7.7 Operation of saving registers
(2) Stack pointer (SP) contains odd number
[SP]
(Odd)
[SP] – 1 (Even)
[SP] – 2(Odd)
[SP] – 3 (Even)
[SP] – 4(Odd)
[SP] – 5 (Even)
Address
Sequence in which order
registers are saved
(2)
(1)
Finished saving registers
in four operations.
(3)
(4)
(1) Stack pointer (SP) contains even number
[SP]
(Even)
[SP] – 1(Odd)
[SP] – 2 (Even)
[SP] – 3(Odd)
[SP] – 4 (Even)
[SP] – 5 (Odd)
Note: [SP] denotes the initial value of the stack pointer (SP) when interrupt request is acknowledged.
After registers are saved, the SP content is [SP] minus 4.
Address
Program counter (PCM)
Stack area
Flag register (FLGL)
Program counter (PCL)
Sequence in which order
registers are saved
(2) Saved simultaneously,
all 16 bits
(1) Saved simultaneously,
all 16 bits
Finished saving registers
in two operations.
Program counter (PCM)
Stack area
Flag register (FLGL)
Program counter (PCL)
Saved simultaneously,
all 8 bits
Flag register
(FLGH)
Program
counter (PCH)
Flag register
(FLGH)
Program
counter (PCH)


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