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UPD17708 データシート(PDF) 29 Page - Renesas Technology Corp

部品番号 UPD17708
部品情報  MOS INTEGRATED CIRCUIT
PDF  358 Pages
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メーカー  RENESAS [Renesas Technology Corp]
ホームページ  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

UPD17708 データシート(HTML) 29 Page - Renesas Technology Corp

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27
µPD17704, 17705, 17707, 17708, 17709
2.4.2 Subroutine
(1) Direct subroutine call (“CALL addr”)
The first address of a subroutine that can be called by the direct subroutine instruction is in page 0 of
each segment (addresses 0000H through 07FFH).
(2) Indirect subroutine call (CALL @AR)
The first addresses of a subroutine that can be called by the indirect subroutine call instruction are all
the addresses of the program memory, i.e., addresses 000H through 1FFFH for the
µPD17704,
addresses 0000H through 2FFFH for the
µPD17705, 17707, and 0000H through 3FFFH for the µPD17708
and 17709.
For further information, also refer to 5.3 Address Register (AR).
2.4.3 Table reference
The addresses that can be referenced by the table reference instruction (“MOVT DBF, @AR”) are all the
addresses of the program memory, i.e., addresses 0000H through 1FFFH for the
µPD17704, addresses 0000H
through 2FFFH for the
µPD17705, 17707, and 0000H through 3FFFH for the µPD17708 and 17709.
For further information, also refer to 5.3 Address Register (AR) and 9.2.2 Table reference instruction
(MOVT, DBF, @AR).
2.4.4 System call
The first address of a subroutine that can be called by the system call instruction (“SYSCAL entry”) is the
first 16 steps of each block (block 0 to 7) in page 0 of segment 1 (system segment).
Figure 2-4. Outline of System Call Instruction
Page 1
Page 2
Page 3
Page 0
(16 bits
× 2K steps)
(16 bits
× 8K steps)
Segment 0
Page 1
Page 2
Page 3
(16 bits
× 8K steps)
Segment 1
(system segment)
Block 0
Block 1
Block 2
Block 7
Block 0 of segment 1
Entry address of
SYSCAL instruction
0
0
0
0
0
0
0
0
0
0
1
1
0
1
1
0
7
F
7
F
8
0
8
0
F
F
F
F
0
0
0
0
F
F
F
F
0
0
0
0
H
H
H
H
H
H
H
H
0
0
0
0
0
0
0
0
2
2
3
3
2
3
3
2
7
F
7
F
8
0
8
0
F
F
F
F
0
0
0
0
F
F
F
F
0
0
0
0
H
H
H
H
H
H
H
H
020 F F H
02100 H
021 F F H
02200 H
022 F F H
02700 H
02000 H
0200 F H
Area where entry
address of system
segment can be
specified
.
.
.
.



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