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| 型號： | UPD17246MC-xxx-5A4 |
| 廠商： | NEC Corp. |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCONTROLLERS FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTERS |
| 中文描述： | 4位單片微控制器的小型通用兩用紅外遙控遞質(zhì) |
| 文件頁數(shù)： | 25/102頁 |
| 文件大小： | 461K |
| 代理商： | UPD17246MC-XXX-5A4 |
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25
Data Sheet U15002EJ1V0DS
μ
PD17240, 17241, 17242, 17243, 17244, 17245, 17246
2.4.2
System registers (SYSREG)
The system registers are registers that are directly related to control of the CPU. These registers are mapped to
addresses 74H to 7FH on the data memory and can be referenced regardless of bank specification.
The system registers include the following registers.
Address registers (AR0 to AR3)
Window register (WR)
Bank register (BANK)
Memory pointer enable flag (MPE)
Memory pointers (MPH, MPL)
Index registers (IXH, IXM, IXL)
General register pointers (RPH, RPL)
Program status word (PSWORD)
Figure 2-7. Configuration of System Registers
b
3
b
2
b
1
b
0
b
3
b
2
b
1
b
0
b
3
b
2
b
1
b
0
b
3
b
2
b
1
b
0
b
3
b
2
b
1
b
0
b
3
b
2
b
1
b
0
b
3
b
2
b
1
b
0
b
3
b
2
b
1
b
0
b
3
b
2
b
1
b
0
b
3
b
2
b
1
b
0
b
3
b
2
b
1
b
0
b
3
b
2
b
1
b
0
74H
75H
76H
77H
78H
79H
7AH
7BH
7CH
7DH
7EH
7FH
AR 3
AR 2
AR 1
AR 0
WR
BANK
IXH
IXM
IXL
RPH
RPL
PSW
MPH
MPL
Address register
(AR)
Window
register
(WR)
Bank
register
(BANK)
Data memory
row address
pointer (MP)
Index register
(IX)
General
register
pointer
(RP)
Program
status
word
(PSWORD)
0 0 0
0 0
0 0
0 0
M
P
E
B
C
D
C
M
P
C
Y Z
I
X
E
(RP)
(IX)
(MP)
(BANK)
Data
Bit
Symbol
Name
Address
Initial
value
at
reset
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Undefined
(WR)
(AR) ( PD17242,17243)
μ
(AR) ( PD17241)
μ
(AR) ( PD17240)
μ
0 0 0 0 0
0 0 0 0
0 0
(AR) ( PD17244,17245,17246)
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