Zilog Z8F0411 - Manual (Page 76)

MDS General-Purpose Board Development Kit
User Manual
UM016905-1207 Appendix—MDS-PM Board Pin Maps
65
Serial Port Control
J2 (DIS_RS232) on the processor module is don’t care when the
module is plugged into the MDS-GP board. The console RS-232
driver U1 is always disabled because the –DIS_RS232 signal is
grounded by MDS-GP board via JP2-50.
J3(DIS_IrDA) on the processor module is to be removed to allow the
MDS-GP board to control the IrDA module. If this jumper is installed,
IrDA on the processor module is always disabled.
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 sig-
nals 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
Note: