Interrupt Logic

When the device is powered up, the hardware initialization circuit reads the value stored in the block protection word. The value is then loaded to an inter- nal register and the security state of the ROM is identified. Until this occurs, execution of any instructions is suspended.

The same initialization sequence is executed before entry into the special test-modes available on the P614 and C614 (EPROM mode, emulation mode, and trace mode). This insures that the protection scheme is always in force when running the processor in one of these modes. A dedicated circuit ensures that a switch between emulation mode and trace mode cannot occur without going through the initialization (security check). This forces all look-up tables and long constant references to originate from an external program source, when in emulation mode. It is possible to switch from trace mode to emulation mode by lowering VPP, but this transition, by design, does not jeopardize code security.

2.6.5Macro Call Vectors

Macro call vectors are similar to CALL instructions except they take an 8-bit address. The upper 8 bits is always 7Fh. See Section 4.14.83, VCALL, for more information on the VCALL instruction.

2.7 Interrupt Logic

An eight-level interrupt system is included as part of the C614's core processor. The initialization and control of these interrupts is governed by the following components: the global interrupt enable, the interrupt flag register, the interrupt mask register, and the interrupt service branch. Each of these is described below.

Interrupts must be globally enabled using the INTE instruction, and they are globally disabled using the INTD instruction. INTE sets the global interrupt enable bit, and INTD clears the global interrupt enable bit. The state of this bit specifically determines whether any interrupt service branches will be taken. The global interrupt enable appears as bit 4 within the status register (STAT).

Each interrupt level waits for the conditions of its trigger event (refer to Figure 2±8). At the time that a trigger event occurs, the respective bit is automatically SET in the interrupt flag register (IFR). The IFR is an 8-bit wide port-addressed register; wherein, each interrupt level is represented. A set bit in the IFR indicates that the interrupt is pending and waiting to be serviced. A clear bit indicates that the interrupt is not currently pending. The address of the IFR is 0x39. After a RESET low, the IFR is left in the same state it was before

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Texas Instruments MSP50C614 manual Interrupt Logic, Macro Call Vectors
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MSP50C614 specifications

The Texas Instruments MSP50C614 is a microcontroller that belongs to the MSP430 family, renowned for its low power consumption and versatile functionality. Primarily designed for embedded applications, this microcontroller is favored in various industries, including consumer electronics, industrial automation, and healthcare devices.

One of the standout features of the MSP50C614 is its ultra-low power technology, which enables it to operate in various power modes. This makes it ideal for battery-powered applications, where energy efficiency is crucial. The MSP430 architecture allows for a flexible power management system, ensuring that energy is conserved while providing robust performance.

The MSP50C614 is equipped with a 16-bit RISC CPU that delivers high performance while maintaining low power usage. With a maximum clock frequency of 16 MHz, it can execute most instructions in a single cycle, resulting in swift operation and responsive performance. This microcontroller also comes with a generous flash memory capacity, allowing developers to store large amounts of code and data conveniently.

In terms of peripherals, the MSP50C614 is highly versatile. It features a range of digital and analog input/output options, including multiple timers, GPIO ports, and various communication interfaces like UART, SPI, and I2C. This extensive set of peripherals allows for seamless integration with other components and simplifies the design of complex systems.

The integrated 12-bit Analog-to-Digital Converter (ADC) stands out as a valuable characteristic of the MSP50C614. This feature enables the microcontroller to convert physical analog signals into digital data, making it particularly useful for sensing applications and real-time monitoring.

Another noteworthy technology employed in the MSP50C614 is its support for low-voltage operations. With a broad supply voltage range, this microcontroller can function efficiently in diverse environments and is suitable for low-power applications, enhancing its practicality.

Moreover, Texas Instruments provides software support in the form of Code Composer Studio and various libraries that make it easier for developers to program and utilize the MSP50C614 effectively.

In summary, the Texas Instruments MSP50C614 microcontroller is a powerful, low-power solution equipped with the features and technologies necessary for efficient operation in a wide array of applications. Its blend of performance, flexibility, and energy efficiency makes it a popular choice among engineers and designers looking to create innovative, sustainable designs in the rapidly evolving tech landscape.
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