VDP 31xxB
PRELIMINARY DATA SHEET
Table 3–5: Control Registers of the Fast Processor for control of back-end functions
– default values are initialized at reset
FP Sub-
address
Function
Default
Name
FP Display Control Register
1)
h’130
h’131
h’132
h’139
White Drive Red (0...1023)
White Drive Green (0...1023)
White Drive Blue (0...1023)
700 WDR
700 WDG
700 WDB
256 IBR
1)
1)
Internal Brightness, Picture (0...511), the center value is 256, the range
allows for both increase and reduction of brightness.
h’13c
h’13a
Internal Brightness, Measurement (0...511), the center value is 256, the
brightness for measurement can be set to measure at higher cutoff cur-
rent. The measurement brightness is independent of the drive values.
256 IBRM
Analog Brightness for external RGB (0...511), the center value is 256, the
range allows for both increase and reduction of brightness.
256 ABR
350 ACT
h’13b
Analog Contrast for external RGB (0...511)
1)
The white drive values will become active only after writing the blue value WDB, latching of new values is indicated
by setting the MSB of WDB.
FP Display Control Register, BCL
h’144
h’142
h’143
h’145
h’105
BCL threshold current, 0...2047 (max ADC output ~1152)
BCL time constant 0...15 →13 ... 1700 msec
BCL loop gain. 0..15
1000 BCLTHR
15 BCLTM
0
BCLG
BCL minimum contrast 0...1023
307 BCLMIN
Test register for BCL/EHT comp. function, register value:
0
BCLTST
0
1
normal operation
stop ADC offset compensation
x>1 use x in place of input from Measurement ADC
FP Display Control Register, Deflection
h’103
h’102
interlace offset, –2048..2047
This value is added to the SAWTOOTH output during one field.
0
7
INTLC
DSCC
discharge sample count for deflection retrace,
SAWTOOTHDACoutputimpedanceisreducedforDSCClinesafterver-
tical retrace.
h’11f
vertical discharge value,
–1365 DSCV
SAWTOOTH output value during discharge operation, typically same as
A0 init value for sawtooth.
h’10b
h’10a
EHT (electronic high tension) compensation coefficient, 0...511
0
EHT
EHT time constant. 0..15 ––> 3.2..410 msec
15 EHTTM
44
Micronas
MICRONAS [ MICRONAS ]
