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Switch Configuration
3.1.8
JMP8: Yellow LED Enable
When this jumper is inserted, the Yellow LED D6 is connected to port pin 3.5.
The other side of D6 is connected to a 220Ω resistor which connects to the
DV
is output as a low voltage.
3.1.9
JMP9: SPI/I2C Data Connection
This six pin jumper is provided to configure the data lines for SPI or I
With jumpers on pins 1−3 and 2−4, the data lines are configured for SPI com-
munications with P1.2 and P1.3. With jumpers on 3−5 and 4−6, the DIN and
DOUT lines are connected together for I
3.1.10 JMP10: SPI/I2C Clock Select
When pins 1−2 are connected, the clock signal (P3.6/SCK) is connected to the
SPI devices. When pins 2−3 are connected, the clock signal is connected to
the I
3.2 Switch Configuration
3.2.1
INT Switch
Switch SW2 is a miniature pushbutton which, when pressed, shorts (through
a 1K resistor) Port 3.2 to ground. This pin is the INT0 pin and therefore can be
set up to cause an interrupt when this pin goes low.
3.2.2
Reset Switch
Switch SW1 is a miniature pushbutton which, when pressed, forces the
MSC1200 RST line high. When released, the MSC1200 will enter a reset
cycle. If communication becomes disrupted between the host and the board,
or the board is unresponsive, pressing RESET will return the system to normal
operation.
3.2.3
PRG LD Switch
Switch SW3 is a miniature pushbutton which, when pressed, forces the
MSC1200 RST line high. It also pulls the PSEN line low so that when released,
the MCU will enter a reset cycle in the Program Load mode. Program execu-
tion will be from the on-chip ROM and it first starts by waiting for a carriage
return so that it can perform an autobaud function. This mode is used to load
a hex file into the flash memory for execution.
3-4
voltage. This 220Ω resistor provides the current limiting when the P3.5
DD
2
C memory device.
2
2
C operation.
C control.
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