參數(shù)資料
型號: SM5M2
廠商: Sharp Corporation
英文描述: 4-Bit Single-Chip Microcomputer(LCD Driver)
中文描述: 4位單片機(jī)(LCD驅(qū)動器)
文件頁數(shù): 7/28頁
文件大?。?/td> 253K
代理商: SM5M2
SM5M2
- 7 -
SYSTEM CONFIGURATION
A Resister and X Register
The A register (or accumulator : A
CC
) is a 4-bit
general purpose register. The register is mainly
used in conjunction with the ALU, C flag and RAM
to transfer numerical value and data to perform
various operations. The A register is also used to
transfer data between input and output pins.
The X register (or auxiliary accumulator) is a 4-bit
register and can be used as a temporary register.
It loads contents of the A register or its content is
transferred to the A register.
When the table reference instruction PAT is used,
the X and A registers load ROM data.
A pair of A and X registers can accommodate 8-bit
data.
7
3
0
0
0
3
EX instruction (swap)
SB register
B
M
register
B register
B
L
register
3
3
0
0
A register
X register
EXAX instruction
c
Areg
ALU
Result of operation
4-bit data
4-bit data
Fig. 1 Data Transfer Example Between
A Register and X Register
Arithmetic and Logic Unit (ALU) and
Carry Signal Cy
The ALU performs 4-bit parallel operation.
B Register and SB Register
B register (B
M
, B
L
)
The B register is an 8-bit register that is used to
specify the RAM address.
The upper 4-bit section is called B
M
register and
lower 4-bit B
L
.
SB register
The SB register is an 8-bit register used as the
save register for the B register. The contents of B
register and SB register can be exchanged through
EX instruction.
Fig. 3 B Register and SB Register
Fig. 2 ALU
The ALU operates binary addition in conjunction
with RAM, C flag and A register. The carry signal
Cy is generated if a carry occurs during ALU
operation. Some instructions use Cy : ADC
instruction sets/clears the content of the C flag;
ADX instruction causes the program to skip the
next instruction. Note that Cy is the symbol for
carry signal and not for C flag.
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