參數(shù)資料
型號(hào)： PCF8820
廠商： NXP Semiconductors N.V.
英文描述： 67 x 101 Grey-scale/ECB colour dot matrix LCD driver
中文描述： 67 × 101 Grey-scale/ECB彩色點(diǎn)陣LCD驅(qū)動(dòng)器
文件頁(yè)數(shù)： 17/60頁(yè)
文件大?。?/td> 316K
代理商： PCF8820
2000 Dec 07
17
Philips Semiconductors
Product specification
67
×
101 Grey-scale/ECB colour dot matrix
LCD driver
PCF8820
7.18.5
I
2
C-
BUS PROTOCOL
The PCF8820 is a slave transmitter/receiver. If data is to
be read from the device, the SDA_OUT output must be
used.
Before any data is transferred over the I
2
C-bus, the
destination device is addressed first (see Fig.15).
The PCF8820 has four 7-bit slave addresses reserved:
0111 100, 0111 101, 0111 110 and 0111 111. The two
least significant bits of the slave address are set by
connecting slave address inputs SA1 and SA0 to either
V
SS1
(logic 0) or V
DD1
(logic 1).
A write sequence (see Fig.17) is initiated with a START
condition (S) from the I
2
C-bus master which is followed by
the slave address. Only the addressed slave
acknowledges. After acknowledgement, one or more
command words follow which define the status of the
addressed slave.
A command word consists of a control byte (see Fig.16)
defining ‘continuation’ bit Co and ‘register selection’
bit RS, plus a data byte. The last control byte is indicated
by resetting bit Co = 0. The control and data bytes are also
acknowledged by all addressed slaves on the bus.
Depending on the setting of bit RS in the last control byte,
either a series of display data bytes or command data
bytes may follow.
If bit RS = 1, the data bytes are stored as display data in
the DDRAM at the address specified by the data pointer.
The data pointer is automatically incremented.
If bit RS = 0, the data byte is interpreted as a command
byte to be decoded and the device will be set according to
the received commands.
Only the addressed PCF8820 acknowledges after each
byte is received. The I
2
C-bus master issues a stop
condition (P) at the end of the transmission.
MGU185
S
0
1
1
1
1
SA0
SA1
A
slave address
R/W
acknowledge
bit
START
condition
slave
address
bit 1
read/write
bit
slave
address
bit 0
Fig.15 Slave address.
MGT124
Co
RS
X
X
X
X
X
X
control byte
register
selection
bit
continuation
bit
Fig.16 Control byte.
handbook, full pagewidth
MGT125
S 0 1 1 1 1
S
A
0
S
A
1
0 A
acknowledgement
from PCF8820
acknowledgement
from PCF8820
acknowledgement
from PCF8820
acknowledgement
from PCF8820
acknowledgement
from PCF8820
1
control byte
A
data byte
data byte
m
≥
0 bytes
1 byte
slave address
2n
≥
0 bytes
A
Co
update
data pointer
Co
0
A
A P
RS
R/W
control byte
RS
Fig.17 Write sequence: master transmits bytes to slave receiver.
相關(guān)PDF資料
PDF描述
PCF8820U 67 x 101 Grey-scale/ECB colour dot matrix LCD driver
PCF8831 STN RGB - 160 output row driver
PCF8831U STN RGB - 160 output row driver
PCF8833 STN RGB - 132 X 132 X 3 driver
PCF88331 STN RGB - 132 X 132 X 3 driver
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PCF8820U 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:67 x 101 Grey-scale/ECB colour dot matrix LCD driver
PCF8831 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:STN RGB - 160 output row driver
PCF8831U 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:STN RGB - 160 output row driver
PCF8832 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:STN RGB - 384 output column driver
PCF8833 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:STN RGB - 132 X 132 X 3 driver
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