XC886/888CLM
Memory Organization
User’s Manual
3-5
V1.3, 2010-02
Memory Organization, V 1.2
3.3.2
External Data Memory
The 1.5-Kbyte XRAM is mapped to both the external data memory area and the program
memory area. It can be accessed using both ‘MOVX’ and ‘MOVC’ instructions.
The ‘MOVX’ instructions for XRAM access use either 8-bit or 16-bit indirect addresses.
While the DPTR register is used for 16-bit addressing, either register R0 or R1 is used
to form the 8-bit address. The upper byte of the XRAM address during execution of the
8-bit accesses is defined by the value stored in register XADDRH. Hence, the write
instruction for setting the higher order XRAM address in register XADDRH must precede
the ‘MOVX’ instruction.
XADDRH
On-Chip XRAM Address Higher Order
Reset Value: F0
H
7
6
5
4
3
2
1
0
ADDRH
rw
Field
Bits
Type Description
ADDRH
7:0
rw
Higher Order of On-chip XRAM Address
This value is from F0
H
to F5
H
for the XC886/888.
*
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