參數(shù)資料
型號: UPD178F124
英文描述: 78K/0 Series for Instructions | User's Manual[10/2001]
中文描述: 78K線/ 0系列說明|用戶手冊[10/2001]
文件頁數(shù): 39/129頁
文件大?。?/td> 644K
代理商: UPD178F124
17
CHAPTER 2 REGISTERS
User's Manual U12326EJ4V0UM
2.2 General-Purpose Registers
General-purpose registers are mapped at particular addresses (FEE0H to FEFFH) of the data memory. These
registers consist of 4 banks, each bank consisting of eight 8-bit registers (X, A, C, B, E, D, L and H).
In addition that each register can be used as an 8-bit register, two 8-bit registers in pairs can be used as a 16-
bit register (AX, BC, DE and HL).
General-purpose registers can be described in terms of functional names (X, A, C, B, E, D, L, H, AX, BC, DE
and HL) and absolute names (R0 to R7 and RP0 to RP3).
Register banks to be used for instruction execution are set with the CPU control instruction (SEL RBn). Because
of the 4-register bank configuration, an efficient program can be created by switching between a register for normal
processing and a register for processing upon interrupt generation for each bank.
Table 2-1. General-Purpose Register Absolute Address Correspondence Table
Bank Name
Register
Absolute Address
Bank Name
Register
Absolute Address
Functional
Absolute
Functional
Absolute
Name
BANK0
H
R7
FEFFH
BANK2
H
R7
FEEFH
L
R6
FEFEH
L
R6
FEEEH
D
R5
FEFDH
D
R5
FEEDH
E
R4
FEFCH
E
R4
FEECH
B
R3
FEFBH
B
R3
FEEBH
C
R2
FEFAH
C
R2
FEEAH
A
R1
FEF9H
A
R1
FEE9H
X
R0
FEF8H
X
R0
FEE8H
BANK1
H
R7
FEF7H
BANK3
H
R7
FEE7H
L
R6
FEF6H
L
R6
FEE6H
D
R5
FEF5H
D
R5
FEE5H
E
R4
FEF4H
E
R4
FEE4H
B
R3
FEF3H
B
R3
FEE3H
C
R2
FEF2H
C
R2
FEE2H
A
R1
FEF1H
A
R1
FEE1H
X
R0
FEF0H
X
R0
FEE0H
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