Si1010/1/2/3/4/5
SFR Definition 10.1. EMI0CN: External Memory Interface Control
Bit
7
6
5
4
3
2
1
0
PGSEL
Name
Type
Reset
R/W
0
R/W
0
R/W
0
R/W
0
R/W
0
R/W
0
R/W
0
R/W
0
SFR Page = 0x0; SFR Address = 0xAA
Bit
7:1
0
Name
Unused
PGSEL
Function
Read = 0000000b; Write = Don’t Care
XRAM Page Select.
The EMI0CN register 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
determines which page of XRAM is accessed.
For Example:
If EMI0CN = 0x01, addresses 0x0100 through 0x01FF will be accessed.
If EMI0CN = 0x00, addresses 0x0000 through 0x00FF will be accessed.
Rev. 1.0
127