STV5730 ST Microelectronics, STV5730 Datasheet - Page 11

• Manufacturer Part Number: STV5730
• Description: MULTISTANDARD ON-SCREEN DISPLAY FOR VCR
• Manufacturer: ST Microelectronics

This 8-bit data message writes the data at the location indicated by the write pointer. The 4-bit data MSB
is copied from the last previous 16-bit data message.
The 0-bit data message writes a data at the location indicated by the write pointer. The last data is used
from the previous 8-bit or 16-bit data message.
This 16-bit control message stops the 4*fsc quartz oscillator.
This 16-bit control message resets the circuit and starts the 4*fsc quartz oscillator. This message should
not be used if an external 4 x fsc clock is used instead of the quartz. It is mandatory that reset operation is
as described in paragraph 2.3.
Figure 2
2.2 - The Write Pointer
As described in the ”message format” paragraph,
an address consists of three fields : STRU[7:6],
BUF[11:8], DEPL[4:0].
The STRU[7:6] field indicates whether it is a PAGE
address or a ROW ATTRIBUTE / REGISTER ad-
dress. It also determines the address incrementa-
tion scheme.
- STRU[7:6] = 00 :
DATA
CLK
CSN
DATA
CLK
CSN
DATA
CLK
CSN
15
15
It is a PAGE address. BUF provides the row
number (from 0 to 10) and DEPL provides the
character number (from 0 to 27). DEPL is incre-
0
0
0
0
1
1
12
12
0
1
15
7
11
11
14
6
13
5
12
4
7
don’t care
don’t care
- STRU[7:6] = 01 :
- STRU[7:6] = 11 :
3
mented after each data message. When the write
of a row is completed, the write pointer is auto-
matically set to the next row first character.
It is also a PAGE address but the incrementation
scheme is a bit different : when the write of a row
is completed, the write pointer is automaticallyset
to the first character of the same row.
It is a row attribute or a register address. The BUF
field must be set to 0000 and the DEPL field is
incremented after each data access.
DATA[7:0]
2
2
1
1
0
0
0
0
0
CONTROL
CONTROL
STV5730
DATA
MESSAGE
MESSAGE
MESSAGE
16-BIT
8-BIT
0-BIT
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