參數(shù)資料
型號: M34571G4
廠商: Renesas Technology Corp.
英文描述: SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
中文描述: 單芯片4位微機(jī)的CMOS
文件頁數(shù): 14/126頁
文件大?。?/td> 1627K
代理商: M34571G4
Rev.1.02
REJ03B0179-0102
May 25, 2007
Page 14 of 124
4571 Group
(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 13).
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 14).
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
15).
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 13. Program counter (PC) structure
Fig 14. Data pointer (DP) structure
Fig 15. SD instruction execution example
a
3
a
2
a
1
a
0
a
6
a
5
a
4
PC
H
Specifying page
Program counter
p
3
p
2
p
1
p
0
p
6
p
5
p
4
PC
L
Specifying address
Register Y (4)
Data pointer (DP)
X
2
X
1
X
0
Y
3
Z
1
Z
0
X
3
Y
2
Y
1
Y
0
Register X (4)
Register Z (2)
Specifying
RAM digit
Specifying RAM file
Specifying RAM file group
Specifying bit position
0
0
0
1
Register Y (4)
Set
D
3
D
2
1
D
1
D
0
Port D output latch
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