Programming Model; Lcd Screen Starting Address Register; Table 8-2 Lcd Screen Starting Address Register Description - Motorola MC68VZ328 User 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 Table 8-2.
LSSA
BIT
30 29
31
SSA SS SS
31 A30 A29
TYPE rw rw rw
0 0
RESET
15 14 13
SSA SS SS
15 A14 A13
TYPE rw rw rw
0 0
RESET
Table 8-2. LCD Screen Starting Address Register Description
Name
SSAx Screen Starting Address 31
–
Bits 31 1 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 1 Mbyte memory boundary
(A[19:00]). In other words, A[31:20] has a fixed value for a picture's image.
Reserved Reserved
Bit 0
8-10
LCD Screen Starting Address Register
28 27 26 25
SS SS SS SS
A28 A27 A26 A25
rw rw rw rw
0 0 0 0 0
12 11 10 9
SS SS SS SS
A12 A11 A10 A9
rw rw rw rw
0 0 0 0 0
Description
–
1—This field is the screen starting address
MC68VZ328 User's Manual
24 23 22 21
SS SS SS SS
A24 A23 A22 A21 A20
rw rw rw rw
0 0 0 0
0x0000
8 7 6 5
SS SS SS SS
A8 A7 A6 A5
rw rw rw rw
0 0 0 0
0x0000
0x(FF)FFFA00
BIT
20 19 18 17
SS SS SS SS SSA
A19 A18 A17
rw rw rw rw
0 0 0 0
4 3 2 1
SS SS SS SS
A4 A3 A2 A1
rw rw rw rw
0 0 0 0
Setting
See description.
This bit is reserved
and should be set to 0.
16
16
rw
0
0
0