Signal Descriptions
MOTOROLA
MPC821FADS-DB USER’S MANUAL
5-27
85
PA1
PA1
I/O, X
Port A Bit 1. Also appears at P8, but is
otherwise unused.
86
GND
GND
—
87
88
—
—
—
Not connected.
89
PA0
PA0
I/O, X
Port A Bit 0. Also appears at P8, but is
otherwise unused.
90
GND
GND
—
91
92
TMS
TMS
I/O, X
JTAG Port Test Mode Select signal. It is used
to select testing through the JTAG port. Pulled
up, but is otherwise unused on this board.
93
PB16
PB16
I/O, X
Port B Bit 16. Also appears at P8, but is
otherwise unused.
94
TRST
TRST
O, L
JTAG Port Reset signal. Pulled down with a
zero ohm resistor so that the JTAG logic is
constantly reset. Otherwise, it is unused on this
board.
95
PB15
PB15
I/O, X
Port B Bit 15. Also appears at P8, but is
otherwise unused.
96
RS_EN1
RS_EN1
O, L
RS-232 Port 1 Enable signal. It is connected to
the BCSR1.
97
PB14
PB14
I/O, X
Port B Bit 14. Also appears at P8, but is
otherwise unused.
98
PC4
PC4
I/O, X
Port C Bit 4. Also appears at P8, but is
otherwise unused.
99
PC5
PC5
I/O, X
Port C Bit 5. Also appears at P8, but is
otherwise unused.
100
PC6
PC6
I/O, X
Port C Bit 6. Also appears at P8, but is
otherwise unused.
101
GND
GND
—
102
RS_EN2
RS_EN2
O, L
RS-232 Port 2 Enable signal. It is connected to
the BCSR1.
103
SHIFT_C
SHIFT_C
I/O, X
Shift Clock signal. PD3/SHIFT/CLK on the
MPC821. Not used on the MPC8xxFADS
motherboard. Also appears at P8 and a
dedicated LCD connector.
104
GND
GND
—
105
106
HSYNC
HSYNC
I/O, X
Horizontal Sync signal. PD4/LOAD/HSYNC on
the MPC821. Not used on the MPC8xxFADS
motherboard. Also appears at P8 and a
dedicated LCD connector.
107
VSYNC
VSYNC
I/O, X
Vertical Sync signal. PD5/FRAME/VSYNC on
the MPC821. Not used on the MPC8xxFADS
motherboard. Also appears at P8 and a
dedicated LCD connector.
Table 5-11. PM3 Interconnect Signals (Continued)
PIN
MOTHERBOARD
SIGNAL
DAUGHTERBOARD
SIGNAL
INPUT/
OUTPUT
DESCRIPTION
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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