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| 型號(hào)： | 78064B |
| 廠商： | NEC Corp. |
| 英文描述： | Common to 78K/0 Series |
| 中文描述： | 共同的78K / 0系列 |
| 文件頁(yè)數(shù)： | 27/129頁(yè) |
| 文件大?。?/td> | 644K |
| 代理商： | 78064B |
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27
CHAPTER 3 ADDRESSING
User's Manual U12326EJ4V0UM
15
0
Short direct memory
Effective
address
1
1
1
1
1
1
1
8
7
0
7
OP code
saddr-offset
α
When 8-bit immediate data is 20H to FFH,
α
= 0.
When 8-bit immediate data is 00H to 1FH,
α
= 1.
3.2.4 Short direct addressing
[Function]
The memory to be manipulated in the fixed space is directly addressed with 8-bit data in an instruction word.
This addressing is applied to the 256-byte fixed space FE20H to FF1FH. An internal high-speed RAM and
special function registers (SFRs) are mapped at FE20H to FEFFH and FF00H to FF1FH, respectively.
The SFR area (FF00H to FF1FH) where short direct addressing is applied is a part of the entire SFR area.
Ports that are frequently accessed in a program, a compare register of the timer/event counter and a capture
register of the timer/event counter are mapped in the area FF00H through FF1FH, and these SFRs can be
manipulated with a small number of bytes and clocks.
When 8-bit immediate data is at 20H to FFH, bit 8 of an effective address is set to 0. When it is at 00H to
1FH, bit 8 is set to 1. See
[Illustration]
below.
[Operand format]
Identifier
Description
saddr
Label or FE20H to FF1FH immediate data
saddrp
Label or FE20H to FF1FH immediate data (even address only)
[Description example]
MOV FE30H, #50H; When setting saddr to FE30H and the immediate data to 50H
[Illustration]
Instruction code
0
0
0
1
0
0
0
1
OP code
0
0
1
1
0
0
0
0
30H (saddr-offset)
0
1
0
1
0
0
0
0
50H (immediate data)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 78064Y | Common to 78K/0 Series |
| 78070A | Common to 78K/0 Series |
| 78070AY | Common to 78K/0 Series |
| 78075B | Common to 78K/0 Series |
| 78075BY | Common to 78K/0 Series |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 78064Y | 制造商:NEC 制造商全稱:NEC 功能描述:Common to 78K/0 Series |
| 78065-004 | 制造商:FCI 功能描述: |
| 780-651 | 制造商:WAGO Innovative Connections 功能描述:RL MTD BLK ANGLE BLUE |
| 780651F00000 | 制造商:Aavid Thermalloy 功能描述:8 FT EXTRUSTIONS - Bulk |
| 780653B00590 | 制造商:Aavid Thermalloy 功能描述:- Bulk |
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