4-3. Application Notes
U3-1021 4-10 2/99
Westinghouse Proprietary Class 2C
Table 4-1. User-Accessible I/O
Description I/O Address Width Bit Definitions
LED Status Register
(Write only)
0980H 8 bits Bit 0 = LED 1 (1 = lit, 0 = not lit)
Bit 1 = LED 2 (1 = lit, 0 = not lit)
Note
LED 1 and LED 2 are used by the
BIOS during LC start-up, but may
also be defined by the user
application.
Bit 2 = LED 3 (1 = lit, 0 = not lit)
Bit 3 = LED 4 (1 = lit, 0 = not lit)
Bit 4 = LED 5 (1 = lit, 0 = not lit)
Bit 5 = LED 6 (1 = lit, 0 = not lit)
Bit 6 = LED 7 (1 = lit, 0 = not lit)
Bit 7 = LED 8 (1 = lit, 0 = not lit)
Board Option Register
(Read only)
0A00H 8 bits Bit 0 = (BOOT_SELECT)
1 = Boot up the LC from internal Flash
memory.
0 = Boot up the LC via the Programming
port if the Programming port is
connected to the serial port of an
external PC that is executing the
RLCEXTPC.EXE code.
Bit 1 = 1 (No function)
Bit 2 = (LOC_BAUD_SEL)
1 = Use a 19200 baud rate for the Pmod’s
J1 Programming port.
0 = Use a 9600 baud rate for the Pmod’s
J1 Programming port.
Bit 3 = (Mod_IDA/)
Bit 4 = (Mod_IDB/)
Bit 4 3 Personality Module Style
0 0 RS-232 (1C31169G01)
0 1 RS-485/RS-422 Four wire
(1C31169G02)
1 0 Not defined
1 1 Not defined
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