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參數(shù)資料
| 型號(hào)： | MC141541 |
| 廠商： | Motorola, Inc. |
| 英文描述： | Enhanced Monitor On-Screen Display |
| 中文描述： | 增強(qiáng)顯示器屏幕顯示 |
| 文件頁(yè)數(shù)： | 4/16頁(yè) |
| 文件大?。?/td> | 314K |
| 代理商： | MC141541 |
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MC141541
4
MOTOROLA
PIN DESCRIPTIONS
VSS(A) (Pin 1)
This pin provides the signal ground to the PLL circuitry.
Analog ground for PLL operation is separated from digital
ground for optimal performance.
VCO (Pin 2)
Pin 2 is a control voltage input to regulate an internal oscil-
lator frequency. See the Application Diagram for the applica-
tion values used.
RP (Pin 3)
An external RC network is used to bias an internal VCO to
resonate at the specific dot frequency. The maximum voltage
at Pin 3 should not exceed 3.5 V at any condition. See the
Application Diagram for the application values used.
VDD(A) (Pin 4)
Pin 4 is a positive 5 V supply for PLL circuitry. Analog pow-
er for PLL is separated from digital power for optimal perfor-
mance.
HFLB (Pin 5)
This pin inputs a negative polarity horizontal synchronize
signal pulse to phase lock an internal system clock gener-
ated by the on–chip VCO circuit.
SS (Pin 6)
This input pin is part of the SPI serial interface. An active
low signal generated by the master device enables this slave
device to accept data. This pin should be pulled high to termi-
nate the SPI communication. If M_BUS is employed as the
serial interface, this pin should be tied to either VDD
or VSS.
SDA (MOSI) (Pin 7)
Data and control messages are being transmitted to this
chip from a host MCU via one of the two serial bus systems.
With either protocol, this wire is configured as a uni–direc-
tional data line. (Detailed description of these two protocols
will be discussed in the M_BUS and SPI sections).
SCL (SCK) (Pin 8)
A separate synchronizing clock input from the transmitter
is required for either protocol. Data is read at the rising edge
of each clock signal.
VDD (Pin 9)
This is the power pin for the digital logic of the chip.
VFLB (Pin 10)
Similar to Pin 5, this pin inputs a negative polarity vertical
synchronize signal pulse.
HTONE/PWMCK (Pin 11)
This is a multiplexed pin. When the PWMCK_EN bit is
cleared after power–on or by the MCU, this pin is HTONE
and outputs a logic high during windowing except when
graphics or characters are being displayed. It is used to low-
er the external R, G, and B amplifiers’ gain to achieve a
transparent windowing effect. If the PWMCK_EN bit is set to
1 via M_BUS or SPI, this pin is changed to a mode–depen-
dent clock output with 50/50 duty cycle and is synchronous
with the input horizontal synchronization signal at Pin 5. The
frequency is dependent on the mode in which the EMOSD is
currently running. The exact frequencies in the different reso-
lution modes are described in Table 1.
Table 1. PWM CLK Frequency
NOTE: Hf is the frequency of the input H sync on Pin 5.
Typically, this clock is fed into an external pulse width mod-
ulation module as its clock source. Because of the synchro-
nization between PWM clock and H sync, a better
performance on the PWM controlled functions can be
achieved.
FBKG (Pin 12)
This pin outputs a logic high while displaying characters or
windows when the FBKGC bit in the frame control register is
0, and output a logic high only while displaying characters
when the FBKGC bit is 1. It is defaulted to high–impedance
state after power–on, or when there is no output. An external
10 k
resistor pulled low is recommended to avoid level tog-
gling caused by hand effect when there is no output.
B,G,R (Pins 13,14,15)
EMOSD color output is TTL level RGB to the host monitor.
These three signals are active high output pins that are in a
high–impedance state when EMOSD is disabled.
VSS (Pin 16)
This is the ground pin for the digital logic of the chip.
SYSTEM DESCRIPTION
MC141541 is a full–screen memory architecture. Refresh
is performed by the built–in circuitry after a screenful of dis-
play data has been loaded through the serial bus. Only
changes to the display data need to be input afterward.
Serial data, which includes screen mapping address, dis-
play information, and control messages, are transmitted via
one of the two serial buses: M_BUS or SPI (mask option).
These two sets of buses are multiplexed onto a single set of
wires. Standard parts offer M_BUS transmission. Parts
which offer SPI transmission mode must be specially
manufactured as custom parts.
Data is received from the serial port and stored by the
memory management circuit. Line data is stored in a row
buffer for display and refreshing. During this storing and re-
trieving cycle, bus arbitration logic patrols the internal traffic
to make sure that no crashes occur between the slower seri-
al bus receiver and the fast ‘screen–refresh’ circuitry. After
the full–screen display data is received through one of the
serial communication interfaces, the link can be terminated if
a change of the display is not required.
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