ADVANCE INFORMATION
VDP 313xY
Micronas
49
Table 2
–
8:
Control Registers of the Fast Processor for control of the video backend functions
default values are
initializied at reset
FP Sub-
address
(hex)
Function
Default
Name
(hex)
FP Display Control Register
130
White Drive Red (0...1023)
700
WDR
1)
131
White Drive Green (0...1023)
700
WDG
1)
132
White Drive Blue (0...1023)
700
WDB
1)
139
Internal Brightness, Picture (0...511), the center value is 256, the
range allows for both increase and reduction of brightness.
256
IBR
13C
Internal Brightness, Measurement (0...511), the center value is
256, the brightness for measurement can be set to measure at
higher cutoff current. The measurement brightness is indepen-
dent of the drive values.
256
IBRM
13A
Analog Brightness for external RGB (0...511), the center value is
256, the range allows for both increase and reduction of bright-
ness.
256
ABR
13B
Analog Contrast for external RGB (0...511)
350
ACT
1)
The white drive values will become active only after writing the blue value WDB, latching of new values is indi-
cated by setting the MSB of WDB.
FP Display Control Register, BCL
144
BCL threshold current, 0...2047 (max ADC output ~1152)
1000
BCLTHR
142
BCL time constant 0...15
13 ... 1700 ms
15
BCLTM
143
BCL loop gain. 0..15
0
BCLG
145
BCL minimum contrast 0...1023
307
BCLMIN
105
Test register for BCL/EHT comp. function, register value:
0
normal operation
1
stop ADC offset compensation
x>1
use x in place of input from Measurement
ADC
0
BCLTST
60
Current BCL reduction (0...1023; read only)
1023
BCLREDUC
FP Display Control Register, Deflection
103
interlace offset,
2048..2047
This value is added to the SAWTOOTH output during one field.
0
INTLC
102
discharge sample count for deflection retrace,
SAWTOOTH DAC output impedance is reduced for DSCC lines
after vertical retrace.
7
DSCC
11F
vertical discharge value,
SAWTOOTH output value during discharge operation, typically
same as A0 init value for sawtooth.
1365
DSCV
10B
EHT compensation vertical gain coefficient, 0...511
0
EHTV