Motorola MC68VZ328 - Manual (Page 85)

Programming Model
System Control 5-3
DMAP
Bit 2 Double Map—This control bit controls the
double-mapping function. 0 = The on-chip registers are mapped at
0xFFFFF000–0xFFFFFFFF.
1 = The on-chip registers are mapped at
0xFFFFF000–0xFFFFFFFF and
0xXXFFF000–0xXXFFFFF (XX = “don’t
care”).
Reserved
Bit 1 Reserved This bit is reserved and reads 0.
WDTH8
Bit 0 8-Bit Width Select—This control bit allows the
D[7:0] pins to be used for Port A input/output. 0 = Not an 8-bit system.
1 = 8-bit system.
Table 5-1. System Control Register Description (Continued)
Name Description Setting