參數(shù)資料
型號(hào)： M34250E2FP
廠商： Mitsubishi Electric Corporation
英文描述： SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
中文描述： 單芯片4位微機(jī)的CMOS
文件頁(yè)數(shù)： 11/58頁(yè)
文件大?。?/td> 331K
代理商： M34250E2FP
MITSUBISHI
ELECTRIC
11
MITSUBISHI MICROCOMPUTERS
4250 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
Fig. 1 AMC instruction execution example
Fig. 2 RAR instruction execution example
Fig. 3 Registers A, B and register E
(CY)
(M(DP))
(A)
Addition
ALU
<Carry>
<Result>
CY
A
3
A
2
A
1
A
0
A
0
CY A
3
A
2
A
1
<Rotation>
RAR instruction
<Set>
SC instruction
<Clear>
RC instruction
A
3
A
2
A
1
A
0
B
3
B
2
B
1
B
0
E
7
E
6
E
5
E
4
E
3
E
2
E
1
E
0
A
3
A
2
A
1
A
0
Register A
B
3
B
2
B
1
B
0
Register B
TAB instruction
TEAB instruction
TABE instruction
TBA instruction
Register B
Register A
Register E
Fig. 4 TABP p instruction execution example
FUNCTION BLOCK OPERATIONS
CPU
(1) Arithmetic logic unit (ALU)
The arithmetic logic unit ALU performs 4-bit arithmetic such
as 4-bit data addition, comparison, and bit manipulation.
(2) Register A and carry flag
Register A is a 4-bit register used for arithmetic, transfer,
exchange, and I/O operation.
Carry flag CY is a 1-bit flag that is set to “1” when there is a
carry with the AMC instruction (Figure 1).
It is unchanged with both A n instruction and AM instruction.
The value of A
0
is stored in carry flag CY with the RAR
instruction (Figure 2).
Carry flag CY can be set to “1” with the SC instruction and
cleared to “0” with the RC instruction.
(3) Registers B and E
Register B is a 4-bit register used for temporary storage of 4-
bit data, and for 8-bit data transfer together with register A.
Register E is an 8-bit register. It can be used for 8-bit data
transfer with register B used as the high-order 4 bits and
register A as the low-order 4 bits (Figure 3).
(4) Register D
Register D is a 3-bit register.
It is used to store a 7-bit ROM address together with register
A and is used as a pointer within the specified page when the
TABP p, BLA p, or BMLA p instruction is executed (Figure 4).
Specifying address
TABP p instruction
p
3
p
2
p
1
p
0
PC
H
DR
2
DR
1
DR
0
A
3
A
2
A
1
A
0
PC
L
Immediate field
value p
The contents of
register D
ROM
8
4
0
Middle-order 4 bits
Low-order 4 bits
Register A (4)
Register B (4)
The contents of
register A
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