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C8051F31x
4.5. Serial Interface (J5)
A RS232 transceiver circuit and DB-9 (J5) connector are provided on the target board to facilitate serial connec-
tions to UART0 of the C8051F310. The TX, RX, RTS and CTS signals of UART0 may be connected to the DB-9
connector and transceiver by installing shorting blocks on header J3.
J3[5–6]- Install shorting block to connect UART0 TX (P0.4) to transceiver.
J3[7–8]- Install shorting block to connect UART0 RX (P0.5) to transceiver.
J3[9–10]- Install shorting block to connect UART0 RTS (P3.1) to transceiver.
J3[11–12]- Install shorting block to connect UART0 CTS (P3.2) to transceiver.
4.6. Analog I/O (J6)
Several of the C8051F310 target device’s port pins are connected to the J6 terminal block. Refer to Table 4 for the
J6 terminal block connections. Install a shorting block on J7[2-3] to connect the AIN2.4 input to the P2.4 pin of the
target device.
Table 4. J6 Terminal Block Pin Descriptions
Pin #
1
2
3
4
Description
P2.5 / AIN2.5
AIN2.4
GND (Ground)
P0.0 / Vref (Voltage Reference)
4.7. USB Debug Adapter Target Board Power Connector (J8)
The USB Debug Adapter includes a connection to provide power to the target board. This connection is routed
from J4[10] to J8[1]. Place a shorting block at header J8[2–3] to power the board directly from an ac/dc power
adapter. Place a shorting block at header J8[1–2] to power the board from the USB Debug Adapter. Please note
that the second option is not supported with either the EC1 or EC2 Serial Adapters.
4.8. Low-Pass Filter (J7)
The C8051F310 target board features a low-pass filter that may be connected to port pin P2.4. Install a shorting
block on J7[1–2] to connect the P2.4 pin of the target device to the low-pass filter input. The output of the low-pass
filter is routed to the PWM signal at J1[2]. The C8051F310 may be programmed to generate a PWM (Pulse-Width
Modulated) waveform which is then input to the low-pass filter to implement a user-controlled PWM digital-to-ana-
log converter. Refer to Applications Note “AN107: Implementing 16-Bit PWM Using the PCA” in the “ documenta-
tion ” directory on the CD-ROM for a discussion on generating a programmable dc voltage level with a PWM
waveform and low-pass filter.
Rev. 0.7
9
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