参数资料
型号: P83C766BDP
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, MROM, 12 MHz, MICROCONTROLLER, PDIP42
封装: 0.600 INCH, PLASTIC, SDIP-42
文件页数: 56/92页
文件大小: 382K
代理商: P83C766BDP
1999 Mar 10
56
Philips Semiconductors
Product specification
Microcontrollers for PAL/SECAM TV
with OSD and VST
P8xCx66 family
17.5.1.3
Space code 1 and Space code 2
If bits <11-5> hold 7FH, then this is a space code. One of
two space codes can be selected: Space code 1 and
Space code 2.
Space code 2 always displays a transparent pattern, equal
to one character width, on the screen regardless of which
primary mode and sub-mode is selected. Space code 1
only differs from Space code 2 when in the Box shadowing
sub-mode. In this mode SP1 displays a 12
×
18 dot matrix
pattern filled with the background colour whilst SP2
displays a transparent pattern. See Figs 37 and 38.
Selection of a specific space code is determined by the
state of bit 0 as detailed in Table 69.
Table 69
Selection of Space code
Bits <4-1> determine the background colour of the
characters that follow the space code dependent upon the
sub-mode selected, see Figs 35 and 36.
BIT 0
SPACE CODE
0
1
Space code 1 is selected.
Space code 2 is selected.
In North-West shadowing sub-mode the background
colour is the colour of the bit pattern shadow
In Box shadowing sub-mode the background colour is
the colour within the character 12
×
18 dot matrix where
no foreground character bits are present
In the Superimpose sub-mode there is no background
colour
In the Border shadowing sub-mode the background
colour is the colour of the border bit pattern.
17.5.1.4
Summary of CR, SP1 and SP2 functions
Carriage Return code:
– Ends the current display row and uses the character
in the display RAM next to this CR code as the first
character of next display row
– Selects the character size of next display row
– Selects the character sub-mode of next display row
– Indicates the end of display for present screen.
Space code 1 and Space code 2:
– Inserts transparent pattern in a row of characters
– Selects the background colour of the characters
following this space code.
Table 70
Format of Character font code
Table 71
Format of Carriage Return code
Table 72
Format of Space code
11
10
9
8
7
6
5
4
3
2
1
0
Character Font code (00H to 7CH)
C4
C3
Foreground colour
T3
Blink
T0
C6
C5
C2
C1
C0
T4
T2
T1
11
10
9
8
7
6
5
4
3
2
1
0
Carriage Return code (7EH)
C4
C3
Character size
T4
Mode
End
T1
C6
C5
C2
C1
C0
T3
T2
T1
11
10
9
8
7
6
5
4
3
2
1
0
Space code 1 and Space code 2 (7FH)
Background colour
0
SP1
SP2
T0
C6
C5
C4
C3
C2
C1
C0
T4
T3
T2
T1
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