ST10R272L - EXTERNAL BUS INTERFACE
168/320
ADDRSEL1 (FE18h / 0Ch)
SFR
Reset Value: 0000h
ADDRSEL2 (FE1Ah / 0Dh)
SFR
Reset Value: 0000h
ADDRSEL3(FE1Ch / 0Eh)
SFR
Reset Value: 0000h
ADDRSEL4 (FE1Eh / 0Fh)
SFR
Reset Value: 0000h
Note
There is no register ADDRSEL0, as register BUSCON0 controls all external
accesses outside the four address windows of BUSCON4...BUSCON1 within the
complete address space.
Bit
Function
RGSZ
Range Size Selection
Defines the size of the address area controlled by the respective BUSCONx/
ADDRSELx register pair. See table below.
RGSAD
Range Start Address
Defines the upper bits of the start address (A23...) of the respective address area.
See table below.
5
4
3
2
1
0
11
10
9
8
7
6
15
14
13
12
rw
RGSAD
RGSZ
rw
5
4
3
2
1
0
11
10
9
8
7
6
15
14
13
12
rw
RGSAD
RGSZ
rw
5
4
3
2
1
0
11
10
9
8
7
6
15
14
13
12
rw
RGSAD
RGSZ
rw
5
4
3
2
1
0
11
10
9
8
7
6
15
14
13
12
rw
RGSAD
RGSZ
rw
