PIC32MX440F256H-80I Datasheet, PDF (440/646 Pages) Microchip Technology – 64/100-Pin General Purpose and USB 32-Bit Flash Microcontrollers

PIC32MX3XX/4XX
19.13 I/O Pin Control
The UART module shares pins with port input/output
control and, in some cases, with other modules. To
configure a pin for use by the UART, any modules shar-
ing the pin must be disabled. After configuring the
UART, the corresponding I/O pins must be configured
using the TRIS bit to be an input or output as is required
by the UART.
TABLE 19-5: PINS ASSOCIATED WITH A UART
Module
Pin Name _Control(2)
Controlling
Bit Field
Required TRIS
bit
Setting
U1TX
U2RX
U1CTS
ON
UTXEN⁽³⁾,
UEN⁽²⁾
ON
URXEN⁽³⁾,
UEN⁽²⁾
ON
UEN⁽²⁾
Output
Input
Input
U1RTS
ON
RTSMD⁽²⁾,
UEN⁽²⁾
BCLK1
ON
IREN⁽²⁾
U2TX
ON
UTXEN⁽³⁾,
UEN⁽²⁾
U2RX
ON
URXEN⁽³⁾,
UEN⁽²⁾
U2CTS
ON
UEN⁽²⁾
Output
Output
Output
Input
Input
U2RTS
ON
RTSMD⁽²⁾,
UEN⁽²⁾
BCLK2
ON
IREN⁽²⁾
Output
Output
Pin
Type⁽¹⁾
Description
D, O UART1 Transmit pin
D, I UART1 Receive pin
D, I
D, O
D, O
D, O
UART1 Clear to Send (CTS)
Duplex mode
UART1 Ready to Send (RTS)
Duplex mode
UART1 IRDA baud clock output
UART2 Transmit pin
D, I UART2 Receive pin
D, I
D, O
D, O
UART2 Clear to Send (CTS)
Duplex mode
UART2 Ready to Send (RTS)
Duplex mode
UART2 IRDA baud clock output
Legend:
ST = Schmitt Trigger input with CMOS levels
O = Output
A = Analog
I = Input
D = Digital
Note 1: All pins are subject to the Device Pin Priority Control.
2: Bits are contained in the UxMODE register.
3: Bits are contained in the UxSTA register.
DS61143E-page 438
Preliminary
© 2008 Microchip Technology Inc.