C167CS Datasheet, PDF (214/517 Pages) Infineon Technologies AG – 16-Bit Single-Chip Microcontroller

C167CS
Derivatives
The External Bus Interface
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.
Definition of Address Areas
The four register pairs BUSCON4/ADDRSEL4 … BUSCON1/ADDRSEL1 allow to
define 4 separate address areas within the address space of the C167CS. Within each
of these address areas external accesses can be controlled by one of the four different
bus modes, independent of each other and of the bus mode specified in register
BUSCON0. Each ADDRSELx register in a way cuts out an address window, within which
the parameters in register BUSCONx are used to control external accesses. The range
start address of such a window defines the upper address bits, which are not used within
the address window of the specified size (see Table 9-6). For a given window size only
those upper address bits of the start address are used (marked “R”), which are not
implicitly used for addresses inside the window. The lower bits of the start address
(marked “x”) are disregarded.
Table 9-6 Address Window Definition
Bit field RGSZ Resulting Window Size Relevant Bits (R) of Start Addr. (A12 …)
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
11xx
4 KByte
8 KByte
16 KByte
32 KByte
64 KByte
128 KByte
256 KByte
512 KByte
1 MByte
2 MByte
4 MByte
8 MByte
Reserved.
RRRRRRRRRRRR
RRRRRRRRRRRx
RRRRRRRRRRx x
RRRRRRRRRx x x
RRRRRRRRx x x x
RRRRRRRx x x x x
RRRRRRx x x x x x
RRRRRx x x x x x x
RRRRx x x x x x x x
RRRx x x x x x x x x
RRx x x x x x x x x x
Rx x x x x x x x x x x
User’s Manual
9-26
V2.0, 2000-07