Circuit Cellar (July 2003)

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Com/ pub/Circuit_Cellar/2003/156. cgi. –––——MSP430x1xx Family User’s Guide, SLAU049A, 2001. b #0, & STATUS_H Jump to HOLD_PC SEND232 Routine Jump to HOLD_UC UART∅_Rx_ISR ADC_ISR WORD_RECEIVED = 1˚ and 2˚ bytes STATUS_H = PC_COMMAND = 3˚ bytes RETi SEND232 SEND232_EqT SEND232_ROLL RETi Figure 8—Two different registers control the microcontroller's program flow. The PC writes one (PC_COMMAND), and the other (STATUS_H) is written by the peripheral when their interrupts are attended. 38 Issue 156 July 2003 CIRCUIT CELLAR® MATLAB MathWorks, Inc.

Its simple trigger is useful for numerous real-world applications. with the code in Listing 1. and 74HC4053 multiplexer. , oscilloscope sensitivity from 5 mV to 5 V per division). The bandwidth achieved is always better than 1 MHz. The signal path that runs from the BNC connector to the ADC input for one channel is shown in Figure 5. As I calculated its values, I took into account the pin’s capacitance, the op-amp frequency response, and the 74HC4053 switch’s on resistance (approximately 70 Ω).

But, I already had the MSP430edu PCB, so why would I simulate first? It’s easier to use the hardware for debugging. I had eight LEDs to display data and indicate the start of routines and subroutines. I also had two switches to give inputs or start an interrupt. I simply flashed the code and tried it. I changed some lines of code and flashed it again within seconds to see the results of the new lines of code. It’s beneficial to work this way because you don’t have to know how to simulate interrupts, timer counts, or calculate how fast the code will run.

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