參數(shù)資料
型號: m789436
廠商: NEC Corp.
元件分類: 8位微控制器
英文描述: 8-Bit Single-Chip Microcontrollers
中文描述: 8位單芯片微控制器
文件頁數(shù): 115/144頁
文件大?。?/td> 1378K
代理商: M789436
CHAPTER 3 CPU ARCHITECTURE
72
User’s Manual U15075EJ1V0UM00
3.4.2 Short direct addressing
[Function]
The memory to be manipulated in the fixed space is directly addressed with 8-bit data in an instruction word.
The fixed space is the 256-byte space FE20H to FF1FH where the addressing is applied. 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 whole SFR area.
Ports that are frequently accessed in a program and the compare register of the timer/event counter are
mapped in this area, 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 FE90H, #50H; When setting saddr to FE90H and the immediate data to 50H
Instruction code
11110101
10010000
01010000
OP code
90H (saddr-offset)
50H (Immediate data)
[Illustration]
15
0
Short direct memory
Effective
address
1
111111
8
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.
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