參數(shù)資料
型號(hào)： GM3120
廠商： Electronic Theatre Controls, Inc.
英文描述： XGA/SXGA LCD Controller
中文描述： 的XGA / SXGA LCD控制器
文件頁(yè)數(shù)： 46/51頁(yè)
文件大小： 1379K
代理商： GM3120
***
Genesis Microchip Confidential ***
gm5110/20 Preliminary Data Sheet
June 2002
39
C5110-DAT-01C
Note that on the last byte read, no acknowledgement is issued to terminate the transfer.
DATA
DEVCEADDRESS
DATA
DATA
START
ACK
ACK
OPERATONCODE
START
HFSn
HCLK
STOP
DEVCEADDRESS
REGSTERADDRESS
RW
ACK
RW
ACK
ACK
Figure 29.
2-Wire Read Operation (0x9x and 0xAx)
Please note that in all the above operations the operation code includes two address bits, as
described in Table 19.
4
4
.
.
1
1
7
7
M
M
i
i
s
s
c
c
e
e
l
l
l
l
a
a
n
n
e
e
o
o
u
u
s
s
F
F
u
u
n
n
c
c
t
t
i
i
o
o
n
n
s
s
4.17.1 Low Power State
The gm5110/20 provides a low power state in which the clocks to selected parts of the chip may
be disabled (see Table 21).
4.17.2 Pulse Width Modulation (PWM) Back Light Control
Many of today’s LCD back light inverters require both a PWM input and variable DC
voltage to minimize flickering (due to the interference between panel timing and inverter’s
AC timing), and adjust brightness. Most LCD monitor manufactures currently use a
microcontroller to provide these control signals. To minimize the burden on the external
microcontroller, the gm5110/20 generates these signals directly.
There are three pins available for controlling the LCD back light, PWM0 (GPIO0), PWM1
(GPIO1) and PWM2 (GPIO2). The duty cycle of these signals is programmable. They may
be connected to an external RC integrator to generate a variable DC voltage for a LCD back
light inverter. Panel HSYNC is used as the clock for a counter generating this output signal.
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