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C8051F50x/51x
14 Rev. 0.2
5.15. Target Board Pin Assignment Summary
Some GPIO pins of the C8051F500 MCU can have an alternate fixed function. For example, pin 46 on the
C8051F500 MCU is designated P0.4, and can be used as a GPIO pin. Also, if the UART0 peripheral on the MCU is
enabled using the crossbar registers, the TX signal is routed to this pin. This is shown in the “Alternate Fixed
Function” column. The “Target Board Function” column shows that this pin is used as TX on the ‘F500 Target
Board. The “Relevant Headers” column shows that this signal is routed to pin 3 of the J17 header and pin 5 of the
J1 header. More details can be found in the C8051F50x data sheet. Some of the GPIO pins of the C8051F500
have been used for various functions on the target board. All pins of the Side A MCU also connect to the 96-pin
(P1) expansion connector which is not explicitly listed below. Table 12 summarizes the C8051F500 MCU pin
assignments on the target board, and also shows the various headers associated with each signal.
Table 12. C8051F500 Target Board Pin Assignments and Headers
MCU Pin
Name
Pin# Primary
Function
Alternate Fixed
Function
Target Board
Function
Relevant Headers
P0.0 8 P0.0 VREF VREF J1[1], J22[1]
P0.1 1 P0.1 CNVSTR CNVSTR J1[2]
P0.2 48 P0.2 XTAL1 XTAL1 J1[3]*, J9[1]
P0.3 47 P0.3 XTAL2 XTAL2 J1[4]*, J10[1]
P0.4 46 P0.4 UART_TX TX_MCU J1[5], J17[3]
P0.5 45 P0.5 UART_RX RX_MCU J1[6], J17[1]
P0.6 44 P0.6 CAN_TX CNVSTR J1[7], J17[5]
P0.7 43 P0.7 CAN_RX SW2 (switch) J1[8], J17[7]
P1.0 42 P1.0 LIN_TX J2[1], J17[9]
P1.1 41 P1.1 LIN_RX J2[2], J17[11]
P1.2 40 P1.2 POTENTIOME-
TER
J2[3], J20[1]
P1.3 39 P1.3 LED J2[4], J19[3]
P1.4 38 P1.4 SWITCH J2[5], J19[1]
P1.5 37 P1.5 GPIO J2[6]
P1.6 36 P1.6 GPIO J2[7]
P1.7 35 P1.7 GPIO J2[8]
P2.0 34 P2.0 GPIO J3[1]
P2.1 33 P2.1 GPIO J3[2]
P2.2 32 P2.2 GPIO J3[3]
P2.3 31 P2.3 GPIO J3[4]
P2.4 30 P2.4 GPIO J3[5]
P2.5 29 P2.5 GPIO J3[6]
P2.6 28 P2.6 GPIO J3[7]
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