Filter
Top Products
Chapter 2 CPU Basics
II - 28
Bank Function
Bank Register for Source Address
The SBNKR register is used to specify bank area for loading instruction from memory to register. Once
this register is specified, bank control is valid for all addressing modes except I/O short instruction and
stack relative indirect instruction.
[ Chapter 2 2-1-8. Addressing modes ]
Bank Register for Destination Address
The DBNKR register is used to specify bank area for storing instruction from register to memory. Once
this register is specified, bank control is valid for all addressing modes except I/O short instruction,stack
relative indirect instruction and bit manipulation instruction.
[ Chapter 2 2-1-8. Addressing modes ]
Figure 2-6-2 Bank Register for Destination Address (DBNKR:x'03F0B', R/W)
Figure 2-6-1 Bank Register for Source Address (SBNKR:x'03F0A', R/W)
Read, modify, write instruction such as bit manipulation (BSET, BCLR, BTST) depend on the
value of the SBNKR register, both of for reading and writing.
SBA1
0
0
1
1
SBA
0
0
1
0
1
Bank for source address selection
bank 0
bank 1
bank 2
bank 3
7654321
0
SBNKR
( At reset : - - - - - - 0 0 )
SBA1------ SBA0
DBA1
0
0
1
1
DBA0
0
1
0
1
Bank for destination address selection
bank0
bank1
bank2
bank3
7654321
0
DBNKR
( At reset : - - - - - - 0 0 )
DBA1------ DBA0