Motorola MC68VZ328 User Manual page 85

Table 5-1. System Control Register Description (Continued)
Name
DMAP Double Map—This control bit controls the
Bit 2 double-mapping function.
Reserved Reserved
Bit 1
WDTH8 8-Bit Width Select—This control bit allows the
Bit 0 D[7:0] pins to be used for Port A input/output.
Description
System Control
Programming Model
Setting
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").
This bit is reserved and reads 0.
0 = Not an 8-bit system.
1 = 8-bit system.
5-3