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Giải thích chi tiết về linh kiện  8-BIT HCMOS MCUs FOR TV FREQUENCY SYNTHESIS WITH OSD
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PIN DESCRIPTION
VDD and VSS. Power is supplied to the MCU using
these two pins. VDD is power and VSS is the ground
connection.
OSCin, OSCout. These pins are internally con-
nected to the on-chip oscillator circuit. A quartz
crystal or a ceramic resonator can be connected
between these two pins in order to allow the cor-
rect operation of the MCU with various stabil-
ity/cost trade-offs. The OSCin pin is the input pin,
the OSCout pin is the output pin.
RESET. The active low RESET pin is used to start
the microcontroller to the beginning of its program.
Additionally the quartz crystal oscillator will be dis-
abled when the RESET pin is low to reduce power
consumption during reset phase (ST6392/99 only).
TEST. The TEST pin must be held at VSS for nor-
mal operation.
PA0-PA7. These 8 lines are organized as one I/O
port (A). Each line may be configured as either an
input with or without pull-up resistor or as an output
under software control of the data direction regis-
ter. Pins PA4 to PA7 are configured as open-drain
outputs (12V drive). On PA4-PA7 pins the input
pull-up option is not available while PA6 and PA7
have additional current driving capability (25mA,
VOL:1V). PA0 to PA3 pins are configured as push-
pull.
PB0-PB2, PB4-PB6. These 6 lines are organized
as one I/O port (B). Each line may be configured as
either an input with or without internal pull-up resis-
tor or as an output under software control of the
data direction register.
PC0-PC7. These 8 lines are organized as one I/O
port (C). Each line may be configured as either an
input with or without internal pull-up resistor or as
an output under software control of the data direc-
tion register. Pins PC0 to PC3 are configured as
open-drain (5V drive) in output mode while PC4 to
PC7 are open-drain with 12V drive and the input
pull-up options does not exist on these four pins.
PC0, PC1 and PC3 lines when in output mode are
“ANDed” with the SPI control signals and are all
Open-drain. PC0 is connected to the SPI clock sig-
nal (SCL), PC1 with the SPI data signal (SDA)
while PC3 is connected with SPI enable signal
(SEN, used in S-BUS protocol). Pin PC4 and PC6
can also be inputs to software programmable edge
sensitive latches which can generate interrupts;
PC4 can be connected to Power Interrupt while
PC6 can be connected to the IRIN/NMI interrupt
line.
DA0-DA5. These pins are the six PWM D/A out-
puts of the 6-bit on-chip D/A converters. These
lines have open-drain outputs with 12V drive. The
output repetition rate is 31.25KHz (with 8MHz
clock).
AFC. This is the input of the on-chip 10 levels com-
parator that can be used to implement the AFC
function. This pin is an high impedance input able
to withstand signals with a peak amplitude up to
12V.
OSDOSCin, OSDOSCout. These are the On
Screen Display oscillator terminals. An oscillation
capacitor and coil network have to be connected to
provide the right signal to the OSD.
HSYNC, VSYNC. These are the horizontal and
vertical synchronization pins. The active polarity of
these pins to the OSD macrocell can be selected
by the user as ROM mask option. If the device is
specified to have negative logic inputs, then these
signals are low the OSD oscillator stops. If the de-
vice is specified to have positive logic inputs, then
when these signals are high the OSD oscillator
stops.
R, G, B, BLANK. Outputs from the OSD. R, G and
B are the color outputs while BLANK is the blank-
ing output. All outputs are push-pull. The active po-
larity of these pins can be selected by the user as
ROM mask option.
62.5kHz OUT. This pin is available only on the
ST6392/99. The pin is an open drain (12V) output
at the frequency of 62.5kHz (with an 8MHz clock).
The pin can be used to drive the SGS-THOMSON
TEA5640
Chroma
Processor. Refer
to the
TEA5640 Data sheet for more information.
®
ST6391,92,93,95,97,99
5/64


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