Publication No. SBC329-HRM/1
FPGA Registers 99
6.35 COM Port Enable Register (0x6BB)
Software should enable transceivers
after
setting the desired COM port mode (i.e.
RS232/RS422). Setting either of bits 0 or 1 to a ‘1’ will enable both COM1 a
nd COM2
transceivers. To disable transceivers, both of bits 0 and 1 must be cleared to ‘0’.
Bits
Read/Write Description
Default
7 to 2
Read only
COM8 to COM3 enable:
COM8 to COM3 are not available
000000
b
1
Read/Write
COM2 enable:
1 = COM transceivers enabled
0 = COM transceivers disabled
0
0
Read/Write
COM1 enable:
1 = COM transceivers enabled
0 = COM transceivers disabled
0
6.36 COM Port Mode Register (0x6BC)
Bits
Read/Write Description
Default
7 to 2
Read only
COM8 to COM3 mode:
COM8 to COM3 are not available
000000
b
1
Read/Write
COM2 mode:
1 = COM2 transceiver in RS422 mode
0 = COM2 transceiver in RS232 mode
0
0
Read/Write
COM1 mode:
1 = COM1 transceiver in RS422 mode
0 = COM1 transceiver in RS232 mode
0