PD17012_15 Datasheet, PDF (41/320 Pages) Renesas Technology Corp – 4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DIGITAL TUNING SYSTEM HARDWARE

µPD17012, 17P012
5. SYSTEM REGISTER (SYSREG)
5.1 Outline of System Register
Figure 5-1 shows the location in the data memory and outline of the system register.
As shown in this figure, the system register is allocated to addresses 74H to 7FH of each bank of the data
memory. Therefore, an identical system register exists at addresses 74H to 7FH of any bank.
Because the system register is located in the data memory, it can be manipulated by any data memory
manipulation instruction.
The system register consists of seven registers.
Figure 5-1. Location on Data Memory and Outline of System Register
Column address
0 1 2 3 4 5 6 7 8 9 ABCDEF
0
Data memory
1
2
3
4
5
BANK0
6
7
BANK1
BANK2
System register
Address
74H
75H
Name Address register
(AR)
Function Controls program memory address.
Address
7AH
7BH
Name Index register
(IX)
Data memory row
address pointer (MP)
Function Modifies address of data memory.
76H
7CH
77H
78H
79H
Window register Bank register
(WR)
(BANK)
Transfers data Specifies bank of
with register file. data memory.
7DH
General register
pointer (RP)
7EH
7FH
Program status
word
(PSWORD)
Specifies address of general
register
Controls operation.
Data Sheet U10101EJ4V0DS
39