參數(shù)資料
型號(hào)： M34570M4-227FP
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)： 10/68頁(yè)
文件大?。?/td> 319K
代理商： M34570M4-227FP
10
MITSUBISHI MICROCOMPUTERS
4570 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
Fig. 7 Program counter (PC) structure
Fig. 8 Data pointer (DP) structure
Fig. 9 SD instruction execution example
(8) Program counter (PC)
Program counter (PC) is used to specify a ROM address (page
and address). It determines a sequence in which instructions
stored in ROM are read. It is a binary counter that increments
the number of instruction bytes each time an instruction is
executed. However, the value changes to a specified address
when branch instructions, subroutine call instructions, return
instructions, or the table reference instruction (TABP p) is
executed.
Program counter consists of PC
H
(most significant bit to bit
7) which specifies to a ROM page and PC
L
(bits 6 to 0) which
specifies an address within a page. After it reaches the last
address (address 127) of a page, it specifies address 0 of the
next page (Figure 7).
Make sure that the PC
H
does not specify after the last page
of the built-in ROM.
(9) Data pointer (DP)
Data pointer (DP) is used to specify a RAM address and
consists of registers Z, X, and Y. Register Z specifies a RAM
file group, register X specifies a file, and register Y specifies
a RAM digit (Figure 8).
Register Y is also used to specify the port D bit position.
When using port D, set the port D bit position to register Y
certainly and execute the SD or RD instruction (Figure 9).
Z
1
Z
0
X
3
X
2
X
1
X
0
Y
3
Y
2
Y
1
Y
0
Data pointer (DP)
Register Z (2)
Register X (4)
Register Y (4)
Specifying
RAM digit
Specifying RAM file
Specifying RAM file group
p
5
p
4
p
3
p
2
p
1
p
0
a
6
a
5
a
4
a
3
a
2
a
1
a
0
Program counter (PC)
PC
H
Specifying page
PC
L
Specifying address
p
6
0
1
0
1
1
Set
Specifying bit position
Port D output latch
Register Y (4)
D
5
D
4
D
0
D
6
D
9
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