Features
MOTOROLA
Universal Asynchronous Receiver/Transmitters (UART) Modules
27-3
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.
NOTE:
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.
UART1_CTS
UART2_CTS
OUT
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.
UART2_DSR
OUT
LOW
2
DSR signal for modem control
UART2_RI
OUT
LOW
2
RI signal for modem control
UART2_DCD
OUT
LOW
2
DCD signal for modem control
UART2_DTR
IN
LOW
2
DTR signal for modem control
Table 27-2. Pin Configuration
Pin
Setting
Configuration Procedure
UART1_RXD
Primary function of
GPIO Port C [12]
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)
UART1_TXD
Primary function of
GPIO Port C [11]
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)
UART1_RTS
Primary function of
GPIO Port C [10]
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)
UART1_CTS
Primary function of
GPIO Port C [9]
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)
UART2_RXD
Primary function of
GPIO Port B [31]
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)
UART2_TXD
Primary function of
GPIO Port B [30]
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)
UART2_RTS
Primary function of
GPIO Port B [29]
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)
Table 27-1. UART Module Interface Signals (Continued)
Signal
Names
I/O
Active
UART
Comments
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