MSP430 reset signal-EEWORLD

Collect

There are two reset signals for MSP430:

document:

Power-on clear signal (PUC),

Power-on reset signal (POR).

Personal understanding:

POR is the first power-on reset, PUC is a reset that occurs under power, cold start and hot start.

There are also signals that can trigger POR and PUC: 5 from the watchdog, 1 from the reset pin, and 1 from the signal generated by an error in writing the FLASH key value.

The POR signal only occurs in two situations: (1) the microprocessor is powered on; (2) the system is reset when a low level is generated on the RST/NMI pin.

The conditions for the generation of the PUC signal: (1) The POR signal is generated; (2) The watchdog timer overflows when the watchdog is valid; (3) An error occurs when writing the watchdog timer security key value; (4) An error occurs when writing the FLASH memory security key value.

The relationship between POR and PUC: The generation of POR signal will cause the system to reset and generate PUC signal. However, PUC signal will not cause the generation of POR signal.

Whether the reset is triggered by the POR signal or the PUC signal, the MSP430 will read the reset interrupt vector from address 0xFFFE, and the program will start executing from the address pointed to by the interrupt vector.

Among the conditions for triggering the PUC signal, except for the POR generating the triggering PUC signal, the other conditions can determine the cause of the PUC signal by reading the corresponding interrupt vector so as to make corresponding processing.

The status after system reset (POR) is as follows: (1) RST/NMI pin function is set to reset function; (2) All I/O pins are set to input; (3) Peripheral modules are initialized, and their register values are the default values in the relevant manual; (4) Status register SR is reset; (5) Watchdog is activated and enters working mode; (6) Program counter PC is loaded with the address at 0xFFFE, and the microprocessor starts executing the program from this address.

There are three typical reset circuits:

(1) Connect a 100K ohm pull-up resistor to the RST/NMI pin. (2) Connect a 0.1uf capacitor to the ground on the basis of (1), which can make the reset more reliable. (3) Connect a diode of model IN4008 to the resistor on the basis of (2), which can reliably realize the system power-on immediately after power failure.

Keywords：MSP430 Reference address：MSP430 reset signal

Previous article：The causes and solutions of msp430 program running away
Next article：[IAR warning] Error[e16]: Segment INTVEC error

Recommended ReadingLatest update time:2024-11-17 00:51

Temperature alarm system based on MSP430 embedded temperature sensor

1. Overall plan of the system The MSP430 microcontroller MCU (Micro Controller Unit) is an ultra-low power 16-bit mixed signal processor launched by TI with rich on-chip peripherals and powerful functions. It includes a series of devices that can be used in different occasions. A significant difference betw

[Industrial Control]

Temperature alarm system based on MSP430 embedded temperature sensor

MSP430 vs. MSP432, who is the strongest?

MSP430 is a legend in the MCU world. It is the benchmark of the lowest power consumption of 16-bit MCU in the world. It has never been surpassed in the past 20 years and is the well-deserved king of low power consumption in the eyes of engineers. In the early years, TI launched the 32-bit low-power MCU product based o

[Microcontroller]

MSP430 vs. MSP432, who is the strongest?

MSP430 Flowing Light Ⅰ

#include msp430f149.h unsigned char LED; unsigned int table = {BIT0,BIT1,BIT2,BIT3,BIT4,BIT5,BIT6,BIT7}; void main( void ) { // Stop watchdog timer to prevent time out reset WDTCTL = WDTPW + WDTHOLD; LED = 0XFF; P2DIR = 0XFF; P2OUT = LED; while(1) { unsigned int i,j;

[Microcontroller]

MSP430: PWM Generation

#define PWM BIT6 // Description: This program generates one PWM output on P1.2 or P1.6 using // Timer_A configured for up mode. The value in CCR0, 25-1, defines the PWM // period and the value in CCR1 the PWM duty cycles. // A 50% duty cycle on P1.6. // ACLK = na, SMCLK = MCLK = TACLK = d

[Microcontroller]

Detailed explanation of capacitive touch MSP430 circuit and LED drive circuit design

　　The MSP430 series of microcontrollers are famous for their low power consumption and rich peripheral modules. For capacitive touch applications, the PIN RO capacitive touch detection method of MSP430 supports direct connection of the IO port to the detection electrode without any peripheral devices, which greatly si

[Microcontroller]

Detailed explanation of capacitive touch MSP430 circuit and LED drive circuit design

Software and hardware design and application of cardiopulmonary auscultation skill training system

The examinee uses the stethoscope to transmit the sound of heart and lung auscultation to the human ear, which completely simulates a real auscultation process. The examinee palpates the different positions of the model through the probe of the stethoscope, and uses the stethoscope to auscultate various pathological ch

[Microcontroller]

Software and hardware design and application of cardiopulmonary auscultation skill training system

Application of MSP430F in ETC

　　TI's MSP430 microcontroller product series has a 16-bit RSIC architecture and ultra-low power consumption. As the latest product series of MSP430, F5xxx uses 0.18um process for the first time, and the current consumed by 1MIPs is as low as an astonishing 160uA, and the main frequency reaches 25MIPs. At the same time

[Microcontroller]

Problems encountered during the migration from ucos2 to msp430

1. main.c and other files cannot be linked. All files must be in one folder. 2. ostimedly() function is a delay function. During the delay period, this task is suspended, and the CPU executes other ready tasks with the highest priority. When the delay is over, it is added to the ready task queue, and the task wi

[Microcontroller]

Popular Resources
Popular amplifiers