參數(shù)資料
型號(hào)： STV9410
廠商： 意法半導(dǎo)體
英文描述： CRT AND LCD SEMI-GRAPHIC DISPLAY PROCESSOR
中文描述： CRT和LCD半圖形顯示處理器
文件頁(yè)數(shù)： 7/25頁(yè)
文件大小： 262K
代理商： STV9410
2. FUNCTIONALDESCRIPTION
STV9410display processoroperationis controlled
by a host microcomputervia a 3-wire serial bus. It
is fully programmable through seven internal
read/write registers and performs all the display
functions either for CRT screen or LCD passive
matrix by generatingpixels from data storedin its
internal memory. In addition, the host microcom-
puter can have straightforward accesses to the
on-chip 6 Kbytes RAM, even during the display
operation.
The following functions are integrated in the
STV9410:
- Crystal oscillator,
- Programmable timing generator,
- Microcomputer3-wire serial interface,
- ROMcharactergeneratorincluding128alphanu-
meric and 128 semigraphic character sets,
- 6 Kbyteson chipRAM to store character codes,
user definable character sets, and any host mi-
crocomputerdata,
and in CRTmode :
- Y outputdriven by a 4-bitDAC,
- Programmablemaster or slave synchro modes,
- R, G, B, I outputs,
in LCD mode :
- LCD interfacefor passivemultiplexed matrix,
- 7 grey levels plus black.
2.1 SERIALINTERFACE
This 3-wire serial interface can be used with any
microcomputer.Datatransferissupportedbyhard-
ware peripherals like SPI or UART and can be
emulated with standard I/O port using software
routine ( see applicationnote ).
NCSinputenablestransferonhighto lowtransition
and transfer stays enabled as long as NCS input
remains at logical low level. NCS input disables
transfer as soon as low to high transition occurs,
whatever transfer state is, and transfer remains
disabled as long as NCS input remains at logical
high level.
SCKinput receivesserial clock; it must be high at
the beginning of the transfer; data is sampled on
rising edge of SCK.
SDAinput(inwritemode)receivesdatawhichmust
be stable at least t
sds
before and at least t
sdh
after
SCK
rising edge. In read mode, SDA receives
address and read command (R/W bit) and then it
switches from input state to output state to send
data (seeData transferand ApplicationNote).
Data Transfer in Write Mode
The host MCU writes data into STV9410 registers
or memory.TheMCUsendsfirstMSBaddresswith
R/W bit clear, it sends secondly LSB address fol-
lowed by data byte(s). STV9410, then, internally
incrementsreceived address,readyto storeasec-
ond databyteif needed,andsoon, aslongasNCS
remainslow (see Figure4). LSBare sentfirst.
Data Transfer in Read Mode
The host MCU reads data from STV9410 registers
or memory.TheMCUsendsfirstMSBaddresswith
R/W bit set, it sends secondly LSB address, then
SDA pin switches from input state to output state
and provides data byte(s) at SCK MCU clock rate.
Notice that a minimum delay is needed before
sendingthe first SCKrising edgeto sample the first
data bit (at least 2
μ
s). After each data byte
STV9410 internally increments address and it
sendsnext dataat SCK frequency.SDAremainsin
output state as long as NCS remains low (see
Figure5).
Address auto-incrementation allows host MCU to
use 8, 16, 32-bit data words to optimize transfer
rate. LSBare sent first. SCKmax speedis 4MHz.
STV9410
7/25
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