Serial port control – Zilog Z8F0411 User Manual
Page 47
MDS General-Purpose Board Development Kit
User Manual
UM016905-1207
Appendix—MDS-PM Board Pin Maps
36
Serial Port Control
Jumper J2 Signals
Enable only one serial port function per interface (COM1 or COM2).
•
RS232_COM1_ENABLE—J2 pins 1, 2
•
RS485_COM1_ENABLED—J2 pins 3, 4
•
IrDA ENABLE (COM1)—J2 pins 5, 6
•
RS232_GPS_COM2_ENABLED—J2 pins 7, 8
•
RS232_COM2_ENABLE—J2 pins 9, 10
•
RS232_RF_COM1_ENABLED—J2 pins 11, 12
•
SOFTWARE_UART_COM1_ENABLED—J2 pins 13, 14
I
2
C Bus Expander U2 Signals for Serial Port Control
U2 is an I
2
C bus expander that can be used via software to control the
signals on jumper J2. If the U2 I
2
C expander is to be used, ensure all
jumpers are removed from J2. U2 powers up with all pins in input mode.
The U2 bus expander I
2
C address is 0100010 R/W.
•
GPS_ENABLE—D0 = 0
•
IrDA ENABLE—D1 = 0
•
RS485 ENABLE—D2 = 0
•
RS232_COM1_ENABLE—D3 = 0
•
RS232_COM2_ENABLE—D4 = 0
•
RF_ENABLE—D5 = 0
•
SW_UART_ENABLE—D6 = 0
•
Spare—D7