NEC PD17062 Datasheet page 31

5.1.1 Structure of the System Register (SYSREG)
The system register consists of 12 nibbles, located at addresses 74H to 7FH in data memory. The system
register is allocated regardless of the bank. That is, the system register is always located at addresses 74H
to 7FH, regardless of the bank.
Fig. 5-2 shows the structure.
Address 74H 75H
Register Address register
(symbol) (AR)
5.1.2 Structure of the Data Buffer (DBF)
The data buffer consists of four nibbles located at addresses 0CH to 0FH of BANK0 in data memory.
Fig. 5-3 shows the structure.
Fig. 5-2 Structure of the System Register
System register (SYSREG)
76H 77H 78H 79H
Window Bank
register register
(WR) (BANK)
Fig. 5-3 Structure of the Data Buffer
Data buffer (DBF)
0CH 0DH
Address
Symbol DBF3 DBF2
7AH 7BH 7CH 7DH
Index register (IX) General-purpose
register pointer
Data memory row
address pointer
(MP)
0EH 0FH
DBF1 DBF0
PD17062
7EH 7FH
Program
status word
(RP) (PSWORD)
31