Akai LCT2662, Service Manual

Page: 70 / 111

Pinout Information Pin Descriptions
Table 2-7 provides detailed Miscellaneous pin descriptions.
Table 2-8 provides detailed Microprocessor Debug Port pin descriptions.
PORTC0 39 I/O D5 General purpose I/O port controlled by PCDAT(7:0) and PCEN(7:0).
PORTC(7:0) can also function as:
PORTC1 40 I/O D5
PORTC2 41 I/O D5
PORTC3 42 I/O D5
PORTC4 43 I/O D5
PORTC5 44 I/O D5
PORTC6 45 I/O D5
PORTC7 46 I/O D5
RXD 67 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 68 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.
Table 2-7 Miscellaneous Pin Descriptions
Name Pin(s) Type Function
TESTEN 142 ID 5 Test Mode Enable. Connect to ground for normal operation.
RESET_N 139 BOD
Bidirectional reset pin. This pin requires a pull-up resistor to V33 (VDDQ3).
The typical value is 3.3K ohm.
• When EXTRSTEN=1, RESET_N is an input.
• When EXTRSTEN=0, RESET_N is an output. In either case a low
indicates reset.
EXTRSTEN 28 ID 5
External Reset Enable.
• When EXTRSTEN=1, the internal reset is disabled and an external reset
must be supplied on the RESET_N pin.
• When EXTRSTEN=0, the internal reset is enabled and RESET_N
becomes 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.
XO 170 O Crystal Output. Connect to external crystal.
Table 2-8 Microprocessor Debug Port Pin Descriptions
Name Pin(s) Type Function
TRST_N 147 ID 5 Debug port reset (low true). Leave floating if debug port is not being used.
TCK 146 ID 5
Debug port serial data clock. Leave floating if debug port is not being
used.
TMS 145 ID 5 Debug port mode select. Leave floating or pull to ground to disable.
TDI 144 ID 5 Debug port serial data in. Leave floating if debug port is not being used.
TDO 143 I/O D5 Debug port serial data out. Leave floating if debug port is not being used.
Table 2-6 Peripheral Interface Pin Descriptions (continued)
Name Pin(s) Type Function
Function When
GBO(7:0) 48-bit graphics input mode
VB(7:0) 24-bit RGB video input mode
U(7:0) 24-bit YUV video input mode
UV(7:0) 16-bit YUV video input mode