Pin Configuration For Uart1 And Uart2; Table 27-2 Pin Configuration - Motorola DragonBall MC9328MX1 Reference Manual

Table 27-1. UART Module Interface Signals (Continued)
Signal
I/O
Names
UART1_CTS OUT
UART2_CTS
UART2_DSR OUT
UART2_RI OUT
UART2_DCD OUT
UART2_DTR IN

27.2.2 Pin Configuration for UART1 and UART2

Table 27-2 lists the pins used for the UART1 and UART2 modules. These pins are multiplexed with other
functions on the device, and must be configured for UART operation.
The user must ensure that the data direction bits in the GPIO are set to the
correct direction for proper operation. See Section 32.5.1, "Data Direction
Registers," on page 32-9 for details.
Pin
UART1_RXD Primary function of
GPIO Port C [12]
UART1_TXD Primary function of
GPIO Port C [11]
UART1_RTS Primary function of
GPIO Port C [10]
UART1_CTS Primary function of
GPIO Port C [9]
UART2_RXD Primary function of
GPIO Port B [31]
UART2_TXD Primary function of
GPIO Port B [30]
UART2_RTS Primary function of
GPIO Port B [29]
MOTOROLA Universal Asynchronous Receiver/Transmitters (UART) Modules
Active UART
LOW 1 and 2 This output pin serves two purposes. Normally, the receiver
indicates that it is ready to receive data by asserting this pin
(low). When the receiver detects a pending overrun, it
negates this pin. For other applications, this pin functions as
a general purpose output controlled by the CTS bit in UART
Control Register 2.
LOW 2 DSR signal for modem control
LOW 2 RI signal for modem control
LOW 2 DCD signal for modem control
LOW 2 DTR signal for modem control
NOTE:
Table 27-2. Pin Configuration
Setting
1.Clear bit 12 of Port C GPIO In Use Register (GIUS_C)
2.Clear bit 12 of Port C General Purpose Register (GPR_C)
1.Clear bit 11 of Port C GPIO In Use Register (GIUS_C)
2.Clear bit 11 of Port C General Purpose Register (GPR_C)
1.Clear bit 10 of Port C GPIO In Use Register (GIUS_C)
2.Clear bit 10 of Port C General Purpose Register (GPR_C)
1.Clear bit 9 of Port C GPIO In Use Register (GIUS_C)
2.Clear bit 9 of Port C General Purpose Register (GPR_C)
1.Clear bit 31 of Port B GPIO In Use Register (GIUS_B)
2.Clear bit 31 of Port B General Purpose Register (GPR_B)
1.Clear bit 30 of Port B GPIO In Use Register (GIUS_B)
2.Clear bit 30 of Port B General Purpose Register (GPR_B)
1.Clear bit 29 of Port B GPIO In Use Register (GIUS_B)
2.Clear bit 29 of Port B General Purpose Register (GPR_B)
Comments
Configuration Procedure
Features
27-3