UPD17073 NEC, UPD17073 Datasheet - Page 32

• Manufacturer Part Number: UPD17073
• Description: 4-BIT SINGLE-CHIP MICROCONTROLLER WITH HARDWARE FOR DIGITAL TUNING SYSTEM
• Manufacturer: NEC

5. SYSTEM REGISTER (SYSREG)
5.1 General
words, the same system register is assigned to addresses 74H-7FH of any bank.
instructions.
status word (PSWORD: 7EH, 7FH) of addresses 74H through 7FH can be manipulated.
32
Address
Address
Figure 5-1 shows the location of the system register on the data memory and outline.
As shown, the system register is assigned to addresses 74H-7FH of the data memory, regardless of bank. In other
Since the system register is located on the data memory, it can be manipulated by all the data memory manipulation
With the PD17073, only the address register (AR: 74H through 77H), bank register (BANK: 79H), and program
Outline
Outline
Name
Name
7AH
74H
Figure 5-1. Location of System Register on Data Memory and Outline
0
1
2
3
4
5
6
7
0
1
Controls program memory address
2
7BH
75H
3
Address register
4
(AR)
5
Column address
6
Data memory
Fixed to 0
BANK0
7
7CH
76H
BANK1
8
9
A
System register
B
C D
7DH
77H
E
F
Fixed to 0
7EH
78H
Program status word
Controls operation
PD17072,17073
(PSWORD)
Specifies data
memory bank
Bank register
(BANK)
79H
7FH