Keil MCB517AC, Руководство пользователя

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6 Chapter 2. Setup
DIP Switches
The following sections describe each of the DIP switches of the MCB517AC
board.
S-CAN : Default OFF
The S_CAN switch determines, whether a 120Ohm terminating resistor is
connected to the CAN_H and CAN_L lines. Switch S_CAN only to ON if this
prototype board is connected to one end of a CAN-bus line.
INT_CAN: Default OFF
The INT_CAN switch selects whether or not the external SAE 80C91 full CAN
controller generates an interrupt on the microcontroller. If INT_CAN is ON, the
interrupt output from the 80C91 is connected to port pin 3.2 (\INT0). If
INT_CAN is OFF, the interrupt output from the 80C91 is not connected to the
microcontroller. Switch INT_CAN to ON if you want to use the CAN interface,
or to OFF if INT0 is used for a different interrupt source.
S3: Default ON
S4: Default ON
The S3 and S4 switches select which serial interface and which baudrate is used
by Monitor 51 to communicate with the PC. Therefore these switches are only
relevant when the Monitor DIP switch is ON. The serial interface settings are
shown in the following table.
Serial Interface Setting for Monitor 51 (Monitor DIP Switch is ON)
S4 S3 ser. Interface Baudrate at 12MHz Baudrate at 16MHz
OFF OFF COM 1 9600 bps 12800 bps
OFF ON COM 1 28800 bps 38400 bps
ON OFF COM 1 38400 bps
ON ON COM 0 9600 bps 12800 bps