參數(shù)資料
型號： M34501M4
廠商： Mitsubishi Electric Corporation
英文描述： SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
中文描述： 單芯片4位微機的CMOS
文件頁數(shù)： 14/113頁
文件大?。?/td> 1252K
代理商： M34501M4
14
4501 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
(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 refer-
ence 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 speci-
fies 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, reg-
ister 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, RD, or SZD instruction (Figure 9).
Note
Register Z of data pointer is undefined after system is released
from reset.
Also, registers Z, X and Y are undefined in the RAM back-up. After
system is returned from the RAM back-up, set these registers.
Fig. 7 Program counter (PC) structure
Fig. 8 Data pointer (DP) structure
Fig. 9 SD instruction execution example
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
P
r
o
g
r
a
m
c
o
u
n
t
e
r
P
f
y
C
H
i
n
S
p
e
c
i
g
p
a
g
e
P
i
n
C
L
g
S
p
e
c
i
f
y
a
d
d
r
e
s
s
p
6
Z
1
Z
0
X
3
X
2
X
1
X
0
Y
3
Y
2
Y
1
Y
0
D
a
t
a
p
o
i
n
t
e
r
(
D
P
)
Register Z (2)
R
e
g
i
s
t
e
r
X
(
4
)
Register Y (4)
S
R
p
e
M
c
i
f
d
y
i
g
n
g
t
A
i
i
S
p
e
c
i
f
y
i
n
g
R
A
M
f
i
l
e
Specifying RAM file group
0
Register Y (4)
0
1
1
Set
Specifying bit position
Port D output latch
D
2
D
3
D
1
D
0
0
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M34513M2 Hook-Up Wire; Conductor Size AWG:26; No. Strands x Strand Size:7 x 34; Jacket Color:White; Approval Bodies:UL, CSA; Approval Categories:UL AWM Style 1061; CSA AWM; Conductor Material:Copper; Jacket Material:Polyvinylchloride (PVC) RoHS Compliant: Yes
M34513M2-420FP Hook-Up Wire; Conductor Size AWG:26; No. Strands x Strand Size:7 x 34; Jacket Color:Black; Approval Bodies:UL, CSA; Approval Categories:UL AWM Style 1061; CSA AWM; Conductor Material:Copper; Jacket Material:Polyvinylchloride (PVC) RoHS Compliant: Yes
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