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PDF PCB8517 Data sheet ( Hoja de datos )
| Número de pieza | PCB8517 | |
| Descripción | Stand-alone OSD for monitor applications | |
| Fabricantes | NXP Semiconductors | |
| Logotipo |  |
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INTEGRATED CIRCUITS
DATA SHEET
PCB8517
Stand-alone OSD for monitor
applications
Objective specification
File under Integrated Circuits, IC02
1997 Mar 03
1 page  
Philips Semiconductors
Stand-alone OSD for monitor applications
Objective specification
PCB8517
FUNCTIONAL DESCRIPTION
3-wire high speed serial interface (HSSI)
The 3-wire (EN, SDI and SCK) high speed serial interface
of the PCB8517 is write only and is used to write data from
the microcontroller to the internal 273 bytes of RAM (see
Section “Internal RAM organization (see Fig.4)”) to control
the OSD. The RAM is organized into 11 rows of
32 columns (see Fig.4) and can be programmed by three
types of sequence (see Section “Data sequence and
format”).
DATA PROTOCOL
Figure 3 shows the protocol of HSSI. To initiate HSSI
transmission, pin EN must be LOW to enable the
PCB8517 to accept data. The EN input must be pulled
LOW prior to the occurrence of SCK and remain LOW until
after the last SCK clock pulse. The rising edge of SCK
facilitates the input data of SDI being shifted into an 8-bit
shift register. When the shift register is full this data will be
loaded into a row address register, column address
register or into one of the internal RAM bytes.
Table 1 shows the switching characteristics when the
HFLB pin has a pulse presented, but when there is no
horizontal sync pulse present on the HFLB pin, the
transmission bit rate will be slowed down to 500 kbit/s.
Table 1 Switching characteristics (under operating
conditions)
SYMBOL
PARAMETER
MIN. MAX. UNIT
tsu(EN)
th(EN)
tSCKL
tSCKH
tsu(SDI)
th(SDI)
EN to SCK set-up time 200
EN to SCK hold time 100
SCK LOW time
200
SCK HIGH time
200
SDI data set-up time 200
SDI data hold time 100
−
−
−
−
−
−
ns
ns
ns
ns
ns
ns
handbook, full pagewiEdtNh
tsu(EN)
SCK
SDI
tSCKH
tSCKL
th(EN)
th(SDI)
tsu(SDI)
B7 B0
MSB
LSB
first byte
B7
B7
B0 B7
B0
last byte
Fig.3 3-wire serial interface protocol.
MGD764
1997 Mar 03
5
5 Page 
Philips Semiconductors
Stand-alone OSD for monitor applications
Objective specification
PCB8517
Table 21 The repeat line of character
CH5 to CH0
LINE NUMBER(1)
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
CH0 = 1
CH1 = 1
CH2 = 1
CH4 = 1
CH5 and CH4 = 0X
CH5 and CH4 = 10
CH5 and CH4 = 11
−−−−−−−−V−−−−−−−
−−−−V−−−−−−−V−−−
−−V−−−V−−−V−−−V−
−V−V−V−V−V−V−V−V
all sixteen lines scanned once
all sixteen lines scanned twice
all sixteen lines scanned three times
Note
1. V indicates which line of the character will be repeated one more time.
Table 22 Column 12 of row 10
BIT 7
OSDEN
BIT 6
BSEN
BIT 5
SHSE
DATA BYTE
BIT 4
BIT 3
BIT 2
reserved
BIT 1
BIT 0
FBC
Table 23 Explanation of Table 22
BIT NAME
DESCRIPTION
7 OSDEN The OSD circuit is active when this bit is set to logic 1. The outputs of R, G, B and FB
will be high impedance when OSD is disabled.
6 BSEN The bordering or shadowing effect is enabled when this bit is set to logic 1.
5 SHSE The shadowing of characters is selected if this bit is set to logic 1, otherwise bordering
of characters is chosen.
0
FBC
This bit defines the output configuration of the FB pin. If this bit is set to logic 0, then the
output of FB will be logic HIGH when displaying character or window, otherwise the
output of FB is logic HIGH only when displaying characters.
1997 Mar 03
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet PCB8517.PDF ] | |
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