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UPD780138 Datasheet(PDF) 85 Page - NEC

No. de Pieza. UPD780138
Descripción  8-Bit Single-Chip Microcontrollers
Descarga  558 Pages
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Fabricante  NEC [NEC]
Página de inicio  http://www.nec.com/
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UPD780138 Datasheet(HTML) 85 Page - NEC

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CHAPTER 3 CPU ARCHITECTURE
User’s Manual U16228EJ2V0UD
85
3.4.5 Special function register (SFR) addressing
[Function]
A memory-mapped special function register (SFR) is addressed with 8-bit immediate data in an instruction word.
This addressing is applied to the 240-byte spaces FF00H to FFCFH and FFE0H to FFFFH. However, the SFRs
mapped at FF00H to FF1FH can be accessed with short direct addressing.
[Operand format]
Identifier
Description
sfr
Special function register name
sfrp
16-bit manipulatable special function register name (even address
only)
[Description example]
MOV PM0, A; when selecting PM0 (FF20H) as sfr
Operation code
1
111011
0
OP code
0
010000
0
20H (sfr-offset)
[Illustration]
15
0
SFR
Effective address
1
111111
87
0
7
OP code
sfr-offset
1


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