User`s manual

Configuration and Operation
Operation
User’s Manual M9328MX1ADS - Rev 2
MOTOROLA Configuration and Operation 17
2.3.5 UART and IrDA
Figure 2-7 shows how the UART and the IrDA circuits are connected.
Figure 2-7 UARTs and IrDA Interface
Buffer
EN
IRDA
EN
TXD1
RXD1
CTS1
RTS1
RS232 Transceiver
J4
UART1
EN
V
CC
GND
S1-1
Software Enable
via I/O expander
TXD2
RXD2
CTS2
RTS2
RS232 Transceiver
J5
UART2
EN
V
CC
GND
S1-2
Software Enable
via I/O expander
V
CC
GND
S1-4
Software Enable
via I/O expander