saa6712e NXP Semiconductors, saa6712e Datasheet - Page 19

• Manufacturer Part Number: saa6712e
• Description: Xga Rgb To Tft Graphics Engine
• Manufacturer: NXP Semiconductors

Philips Semiconductors
8
8.1
The SAA6712E is a highly integrated device with many
features. To get the desired functionality and performance
it must be programmed correctly. In general, before
programming, the device must be switched to the internal
reset state to prevent unwanted functions while changing
the registers.
After writing to all registers the internal reset can be
released. There are some registers (mainly offset
counters) that can be changed during data processing
without an internal reset. All accesses to the on screen
display can be done during data processing.
Table 5 Programming register overview
1999 Aug 25
State
RGB mode detection
RGB auto-adjustment
ADDRESS R/W
XGA RGB to TFT graphics engine
SYSTEM DESCRIPTION
10
11
12
13
14
15
16
17
18
19
20
21
0
1
2
3
4
5
6
7
8
9
Programming registers
R/W iic_test_register[7 to 0]
W
W
W
W
W
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
reserved
reserved
v_lines[7 to 0]
h_clocks[7 to 0]
ref_line[7 to 0]
ref_pixel[7 to 0]
ref_colour[7 to 0]
ref_pixel_red[7 to 0]
ref_pixel_green[7 to 0]
ref_pixel_blue[7 to 0]
black_lines[7 to 0]
black_pixels[7 to 0]
non_black_lines[7 to 0]
D7
D6
D5
19
Table 4 I
When bit SAD = 0 the address is 74H; when bit SAD = 1
the address is 76H.
Table 5 shows the programming model.
D4
MSB
0
pos_
vsync
h_clocks[11 to 8]
ref_pixel[11 to 8]
1
2
C-bus device address
D3
1
pos_
hsync
v_lines[10 to 8]
ref_line[10 to 8]
non_black_lines[10 to 8]
1
D2
0
Preliminary specification
no_
vsync
D1
SAA6712E
1
SAD
intr
no_
hsync
black_
pixels[8]
D0
LSB
R/W