PIC16F84-10I/P

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Embedded - Microcontrollers

The PIC16F84-10I/P is a mid-range 8-bit microcontroller which is low cost, highly reliable and better equipped than the other members of the PIC family. It has a limited range of features, but includes the most necessary ones to assist with basic programming operations.

PIC16F84-10I/P features 20-pins, 16 I/O lines, Nine (9) Differential A/D Channels, 128 bytes EEPROM, 2048 bytes program memory, two (2) Timer/Counters and one (1) Watchdog Timer.

The PIC16F84-10I/P has an 8-bit CPU core and requires an external crystal(or ceramic resonator) or an external clock source for the system oscillator. It divides the clock frequency typically by four, thereby yielding a processing speed of up to 4 MHz (ideally).

Application field

The PIC16F84-10I/P is adequate for a wide range of applications, from robotics and security systems to consumer products and mass production. Its I/O capabilities and A/D converting functions make it suitable for these particular fields.

The PIC16F84-10I/P is an excellent choice for complex touch screen applications that require a large quantity of I/Os, as it has the capacity to run up to 16 ports independently. For embedded and automotive applications, the device has two independent Capture/Compare/PWM (CCP) modules. The PIC16F84-10I/P also supports 16-bit operations and higher instruction rate.

Working principle

The PIC16F84-10I/P runs on a Harvard architecture, meaning that program and data memory are separate. The program store is a 2048 × 14 ROM which is implemented in a 4K × 14 program memory. In most cases, the PIC runs in single-chip mode, which requires external power sources, a capacitor and an external clock. In two-chip mode, the processor operates based on the 8-bit microprocessor instructions, but instead of running on the internal instruction set, the processor uses the external instructions provided by the external program store.

Using an instruction cycle of 12 internal clock cycles, the processor executes all program instructions stored in the program memory. These instructions are grouped into various categories, such as single transfers, multiple transfers, commands and operations. Each instruction is associated with one of the eight register files.

The single and multiple transfers are connected to the memory access queues and are used to move data from the register file associated with that specific instruction directly to the memory or to and from the memory. This allows for data transfers to move faster and become more efficient.

In addition, the PIC16F84-10I/P has multiple levels of interrupts. These features provide more flexibility and capability, since they enable the processor to perform more complex functions. These interrupts are used to alert the processor in case of certain events.

Overall, the PIC16F84-10I/P is a powerful and versatile processor that is suitable for a wide range of embedded applications. Its features and specifications make it an excellent choice for applications in the medical, automotive, industrial control, and consumer electronics fields.

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