24
Signal
Pin
Type
Function
PORTA1
207
I/O
U5
General-purpose I/O port bit controlled by PADAT1 and PAEN1. This pin has one
other possible function when EXTRAMEN=1. When EXTRAMEN=1 and PAEN1=0,
PORTA1 is microprocessor byte-high enable (BHEN)
PORTA2
206
I/O
U5
General-purpose I/O port bit controlled by PADAT2 and PAEN2.
PORTA3
205
I/O
U5
General-purpose I/O port bit controlled by PADAT3 and PAEN3. This pin can also
function as an external clock source for DCLK (DCLKEXT) when both the internal
PLLs are disabled or when DPLLBYP=1.
PORTA4
204
I/O
U5
General-purpose I/O port bit controlled by PADAT4 and PAEN4. This pin has one
other possible function when IREN=1. When IREN=1 and PAEN4=1, this pin can
function as an input to the on-chip IR receiver 0. (IRRCVR0)
PORTA5
203
I/O
U5
General-purpose I/O port bit controlled by PADAT5 and PAEN5. This pin has other
possible functions depending on the IREN, EIEN registers. When EIEN=1 and
PAEN5=1, this pin can function as an external interrupt to the on-chip CPU. When
IREN=1 and PAEN5=1, this pin can function as an input to the on-chip IR receiver 1
(IRRCVR1). When DPLLBYP=1 and PAEN=0, this pin becomes the output of the
DCLK PLL. This output can be routed through an external spread spectrum chip and
then back into port A3 (DCLK input) to implement spread spectrum.
PORTA6
202
I/O
U5
General-purpose I/O port bit controlled by PADAT6 and PAEN6. This pin has one
other possible function when PREF1EN=1. When PREF1EN=1 and PAEN6=0,
PORTA6 is a variable duty-cycle pulse reference generator (PWM) output controlled
by PREF1HI and PREF1LO.
PORTA7
201
I/O
D5
General-purpose I/O port bit controlled by PADAT7 and PAEN7. This pin has one
other possible function when PREF0EN=1. When PREF0EN=1 and PAEN7=0,
PORTA7 is a variable duty-cycle pulse reference generator (PWM) output controlled
by PREF0HI and PREF0LO.
RXD
53
I/O U5 Serial Receive Data. RXD is the serial receive data for the on-chip serial port. This
pin can also function as the 2-wire master data pin when 2WMEN=16.
TXD
54
I/O U5 Serial Transmit Data. TXD is the serial transmit data for the on-chip serial port. This
pin can also function as the 2-wire master clock output pin when 2WMEN=16.
TESTEN
137
ID 5
Test Mode Enable. Connect to ground for normal operation.
RESET_N
132
BOD
Reset Output. RESET_N is a bidirectional pin that can be used to either drive
external logic in the system or receive an external reset signal.
XI
169
I
Crystal Input. Connect to external crystal. XI can also function as the MCLK input
LVTTL-level signal from an external oscillator.
Summary of Contents for 17MB18
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Page 52: ...9 CIRCUIT DIAGRAMS 9 1 17MB18 5 Main Board Schematics ...
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Page 57: ...72 17 TFT TV Service Manual 9 2 Keypad Schematics 17TK26 ...
Page 58: ...73 17 TFT TV Service Manual 9 3 IR LED Board Schematics 17LD23 ...
Page 59: ...74 17 TFT TV Service Manual 9 4 Remote Controller Schematics 11UK10 2 ...
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