C8051F39x/37x
SFR Definition 17.1. EMI0CN: External Memory Interface Control
Bit
7
6
5
4
3
2
1
0
PGSEL
R/W
Name
Type
Reset
R
0
R
0
R
0
R
0
R
0
R
0
0
0
SFR Address = 0xAA; SFR Page = All Pages
Bit
Name
Function
7:2
1:0
Unused
PGSEL
Read = 000000b; Write = Don’t Care
XRAM Page Select.
The PGSEL field provides the high byte of the 16-bit external
data memory address when using an 8-bit MOVX command,
effectively selecting a 256-byte page of RAM. Since the upper
(unused) bits of the register are always zero, the PGSEL deter-
mines which page of XRAM is accessed.
For Example: If PGSEL = 0x01, addresses 0x0100 through
0x01FF will be accessed.
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Preliminary Rev. 0.71