參數(shù)資料
型號(hào)： GM5060-H
廠商： Electronic Theatre Controls, Inc.
英文描述： GRAPHICS PROCESSING IC PROVIDING HIGH QUALITY IMAGES FOR LCD MONITORS
中文描述： 圖形處理芯片提供高品質(zhì)的圖像液晶顯示器
文件頁(yè)數(shù)： 77/85頁(yè)
文件大?。?/td> 1375K
代理商： GM5060-H
Genesis Microchip
gm5060 / gm5060-H Data Sheet
February 2002
C5060-DAT-01G
69
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4.19.1 General Purpose Inputs and Outputs (GPIO’s)
The gm5060 has nine general purpose inputs / outputs (GPIO 8:0). These are typically used
to communicate with other devices in the system such as keypad buttons, NVRAM, LEDs,
audio DAC, etc. Each GPIO has independent direction control as well as open drain or active
drive selection.
GPIO0 and GPIO1 may be optionally configured as PWM back light intensity controls, as
described in section 4.19.2 below.
In addition to these nine GPIOs, the video port data pins (YUV 7:0) can also serve as
general-purpose inputs. YUV 7:0 are available to be directly read from the host register –
there is no directional control required.
4.19.2 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. Many LCD monitor designs currently use a microcontroller to provide these
control signals. To minimize the burden and required resources of the external microcontroller,
the gm5060 generates these signals directly.
There are two pins available for controlling the back light of TFT LCD panels, PWM0 (GPIO0)
and PWM1 (GPIO1). 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. The
display HSYNC signal (DHS) or TCLK may be used as the clock for a counter generating this
output signal.
4.19.3 Low Power State
The gm5060 provides a low power state in which the clocks to selected parts of the chip may be
disabled. See Table 17.
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