FEDL64168-01
Semiconductor
ML64168
Data Memory
The data memory area consists of 8 banks and each bank has 256 nibbles ( 256 × 4 bits ).
The data RAM is assigned to BANK 6, BANK 7 and peripheral ports are assigned to BANK 0.
7FFH
BANK7
Data RAM area
( 256 nibbles )
Data / Stack area ( 128 nibbles )
780H
700H
6FFH
512 nibbles
BANK6
Data RAM area
( 256 nibbles )
600H
Contents of 000H to 07FH
07FH
Inaccessible area
SFR area
100H
0FFH
Unused area
BANK0
4 bits
080H
07FH
000H
000H
Data Memory Map
Half the BANK 7 of Data RAM area ( 128 nibbles ) is shared by the stack area. The stack is a memory
starting from address 7FFH toward the low-order addresses where 4 nibbles are used by Subroutine Call
Instruction and 8 nibbles are used by an interrupt.
The addresses 080H to 0FFH of BANK 0 are not assigned as the data memory, so access to these
addresses has no effect. Moreover, it is impossible to access BANK 1 to BANK 5.
15/49
OKI [ OKI ELECTRONIC COMPONETS ]
