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STV9420 bảng dữ liệu(PDF) 6 Page - STMicroelectronics

tên linh kiện STV9420
Giải thích chi tiết về linh kiện  MULTISYNC ON-SCREEN DISPLAY FOR MONITOR
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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FUNCTIONAL DESCRIPTION
The STV9420/21 display processor operation is
controlled by a host MCU via the I
2C interface. It is
fully programmable through 8 internal read/write
registers (12 for STV9421) and performs all the
display functions by generating pixels from data
stored in its internal memory. After the page down-
loading from the MCU, the STV9420/21 refreshes
screen by its built in processor, without any MCU
control (access).In addition, the host MCU has a
direct access to the on chip 1Kbytes RAM during
the display of the current page to make any update
of its contents.
With the STV9420/21, a page displayed on the
screen is made of several strips which can be of 2
types : spacing or character and which are de-
scribed by a table of descriptors and character
codes in RAM. Several pages can be downloaded
at the same time in the RAM and the choice of the
current display page is made by programming the
CONTROL register.
I - Serial Interface
The 2-wires serial interface is an I
2C interface. To
be connected to the I
2C bus, a device must own its
sl ave ad dr ess ; the sla ve address of t he
STV9420/21 is BA (in hexadecimal).
A6
A5
A4
A3
A2
A1
A0
R/W
10111
01
I.1 - Data Transfer in Write Mode
The host MCU can write data into the STV9420/21
registers or RAM.
To write data into the STV9420/21, after a start, the
MCU must send (Figure 3) :
- First, the I
2C address slave byte with a low level
for the R/W bit,
- The two bytes of the internal address where the
MCU wants to write data(s),
- The successive bytes of data(s).
All bytes are sent MS bit first and the write data
transfer is closed by a stop.
I.2 - Data Transfer in Read Mode
The host MCU can read data from the STV9420/21
registers, RAM or ROM.
To read data from the STV9420/21 (Figure 4), the
MCU must send 2 different I
2C sequences.
The first one is made of I
2C slave address byte with
R/W bit at low level and the 2 internal address
bytes.
The second one is made of I
2C slave address byte
with R/W bit at high level and all the successive
data bytes read at successive addresses starting
from the initial address given by the first sequence.
SCL
SDA
R/W
A7
A6
A5
A4
A3
A2
A1
A0
I1C Slave Address
ACK
LSB Address
ACK
MSB Address
ACK
Start
-
-
A13 A12 A10 A10 A9
A8
Stop
SCL
SDA
R/W
D7
D6
D5
D4
D3
D2
D1
D0
I1C Slave Address
ACK
ACK
Data Byte n
ACK
Start
D7
D6
D5
D4
D3
D2
D1
D0
Stop
Data Byte 1
Figure 4 : STV9420/I
2C Read Operation
SCL
SDA
R/W
A7
A6
A5
A4
A3
A2
A1
A0
-
-
A13
A12
A11
A10
A9
A8
I2C Slave Address
ACK
LSB Address
ACK
MSB Address
ACK
Start
D7
D6
D5
D4
D3
D2
D1
D0
D7
D6
D5
D4
D3
D2
D1
D0
D7
D6
D5
D4
D3
D2
D1
D0
ACK
ACK
Data Byte 1
Data Byte 2
ACK
Data Byte n
Stop
SCL
SDA
Figure 3 : STV9420/I
2C Write Operation
STV9420 - STV9421
6/16


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