Motorola MC68VZ328 8.3 Programming Model

8-10 MC68VZ328 User’s Manual 
Programming Model
8.3 Programming Model
The remaining sections of this chapter provide detailed descriptions of the registers, their settings, and
sample programming examples.
8.3.1 LCD Screen Starting Address Register
The LCD screen starting address (LSSA) register is used to inform the LCD panel where to fetch the data
to be displayed. The bit assignments for the register are shown in the following register display. The
settings for the bits in the register are listed in Table8-2.
LSSA LCD Screen Starting Address Register 0x(FF)FFFA00
BIT
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 BIT 16
SSA
31 SS A30 SS A29 SS A28 SS A27 SS A26 SS A25 SS A24 SS A23 SS A22 SS A21 SS A20 SS A19 SS A18 SS A17 SSA 16
TYPE rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw
RESET 000000000000000 0
0x0000
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
SSA
15 SS A14 SS A13 SS A12 SS A11 SS A10 SS A9 SS A8 SS A7 SS A6 SS A5 SS A4 SS A3 SS A2 SS A1
TYPE rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw
RESET 000000000000000 0
0x0000
Table 8-2. LCD Screen Starting Address Register Description
Name Description Setting
SSAx
Bits 31–1Screen Starting Address 31–1—This field is the screen starting address of the LCD panel. The LCD controller will start fetching pixel data from sys-
tem memory at this address. This field must start at a location that will
enable a complete picture to be stored in 1Mbyte memory boundary
(A[19:00]). In other words, A[31:20] has a fixed value for a picture’s image.
See description.
Reserved
Bit 0 Reserved This bit is reserved and should be set to 0.