Switches
3-4
3.2
Switches
3.2.1
RESET Switch
Switch SW1 is a miniature pushbutton that, when pressed, forces the
MSC1211 RST line high. When released, the MSC1211 enters 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 op-
eration.
3.2.2
INT Switch
Switch SW2 is a miniature pushbutton that, when pressed, shorts Port 3.2 to
ground. This pin is the INT0 pin and, therefore, can be setup to cause an inter-
rupt when this pin goes low.
3.2.3
SW3: Configuration Switch
SW3 provides the means to enable or disable many of the function on the
MSC1211EVM.
Table 3–2. SW3: Configuration Control Switch
Switch
Number
Function
1
Enables pin P3.5 to control the Yellow LED D5
2
Enables pin P3.4 to control the Red LED D4.
3
Enables pin P3.3 to drive the speaker.
4
Enables pin P3.0 to receive data from Serial0 (J5)
5
Disables on–board 22.1184MHz crystal oscillator
6
Enables pin P1.2 to receive data from Serial1 (J4)
7
Allows DTR from Serial0 to reset MSC1211
8
Allows RTS from Serial0 to reset to Prog Load mode
3.2.4
PRG LD Switch
SW4 is a miniature pushbutton that, when pressed, forces the MSC1211 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 execution will be from
the on-chip ROM, and it starts by waiting for a carriage return so that it can per-
form an autobaud function.
Содержание MSC1211
Страница 1: ... April 2003 User s Guide SBAU086 ...
Страница 29: ...Schematics 4 2 4 1 Schematics Figure 4 1 Processor Schematic ...
Страница 30: ...Schematics 4 3 Physical Description Figure 4 2 Power and Analog Inputs Schematic ...
Страница 31: ...Component Locations 4 4 4 2 Component Locations Figure 4 3 Printed Circuit Board Layout ...
Страница 32: ...Power Supply CE Certification 4 5 Physical Description 4 3 Power Supply CE Certification ...
