STV5730A Datasheet, PDF (12/20 Pages) STMicroelectronics – MULTISTANDARD ON-SCREEN DISPLAY FOR VCR, PAY-TV, SATELLITE RECEIVER

STV5730A
FUNCTIONAL DESCRIPTION (continued)
Figure 2
DATA
15
14
13
12
2
1
0
CLK
CSN
DATA
7
6
5
4
3
2
1
0
CLK
CSN
16-B IT
MESSAGE
8-BIT
MESSAGE
DATA
CLK
0-BIT
MESSAGE
CSN
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.
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.
- STRU[7:6] = 01 :
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 automatically
set to the first character of the same row.
- STRU[7:6] = 00 :
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-
- STRU[7:6] = 11 :
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.
2.2.1 - Address Map
PAGE
: ROW 0 : STRU[7:6] = 0 or 1 - BUF[11:8] = 0 - DEPL[4:0] from 0 to 27
ROW 1 : STRU[7:6] = 0 or 1 - BUF[11:8] = 1 - DEPL[4:0] from 0 to 27
......... : .................
..................... ................
ROW 10 : STRU[7:6] = 0 or 1 - BUF[11:8] = 10 - DEPL[3:0] from 0 t0 27
ROW ATTRIBUTES : STRU[7:6] = 11 - BUF[11:8] = 0 - DEPL[4:0] from 0 to 10
REGISTERS
: STRU[7:6] = 11 - BUF[11:8] = 0
DEPL[4:0] = 12 for ZOOM register, 13 for COLOR register,
14 for CONTROL register, 15 for POSITION register,
16 for MODE register
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