参数资料
型号: P87C766CBP
厂商: NXP SEMICONDUCTORS
元件分类: 微控制器/微处理器
英文描述: Microcontrollers for PAL/SECAM TV with OSD and VST
中文描述: 8-BIT, OTPROM, 12 MHz, MICROCONTROLLER, PDIP42
封装: 0.600 INCH, PLASTIC, SDIP-42
文件页数: 49/92页
文件大小: 382K
代理商: P87C766CBP
1999 Mar 10
49
Philips Semiconductors
Product specification
Microcontrollers for PAL/SECAM TV
with OSD and VST
P8xCx66 family
17.3
OSD registers
17.3.1
OSD D
EFAULT
R
EGISTER
(OSDDEF)
This register is used to set the default values for background colour, character size and sub-mode after each VSYNC
pulse. After a system reset OSDDEF holds 22H. These values can be changed by writing new data to OSDDEF or by
starting the screen with a space code (SP1 or SP2) and a CR code.
Table 49
OSD Default Register (SFR address 9CH)
Table 50
Description of OSDEF bits
Table 51
Default sub-mode selection
The default value of OSDDEF gives the following initial settings:
Character size = 1 horizontal line/1 DOSC (Fig.31)
Background colour = blue (R = G = 0, B = 1)
Sub-mode = Box background mode.
7
6
5
4
3
2
1
0
R
G
B
SV
SH
M1
M0
BIT
SYMBOL
DESCRIPTION
7
6
5
4
3
R
G
B
SV
Default background colour.
These 3 bits select the default background colour.
This bit is reserved for future use (intensity output).
Default character size.
If SV = 0, then the vertical dot size is equal to one horizontal
line. If SV = 1, then the vertical dot size is equal to two horizontal lines.
Default horizontal dot size.
If SH = 0, then the horizontal dot size is equal to one OSD
clock. If SH = 1, then the horizontal dot size is equal to two OSD clocks.
Default sub-mode selection.
These 2 bits select the default sub-mode; see Table 51.
2
SH
1
0
M1
M0
M1
M0
SUB-MODE
0
0
1
1
0
1
0
1
Superimpose mode selected.
North-West shadowing mode selected.
Box background mode selected.
Border shadowing mode selected.
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