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PIC18F86J11 Datasheet(PDF) 9 Page - Microchip Technology |
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PIC18F86J11 Datasheet(HTML) 9 Page - Microchip Technology |
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9 / 448 page  © 2007 Microchip Technology Inc. Preliminary DS39778B-page 7 PIC18F87J11 FAMILY 1.0 DEVICE OVERVIEW This document contains device-specific information for the following devices: This family introduces a line of low-voltage, general purpose microcontrollers with the main traditional advantage of all PIC18 microcontrollers – namely, high computational performance and a rich feature set – at an extremely competitive price point. These features make the PIC18F87J11 Family a logical choice for many high-performance applications, where an extended peripheral feature set is required, and cost is a primary consideration. 1.1 Core Features 1.1.1 nanoWatt TECHNOLOGY All of the devices in the PIC18F87J11 family incorporate a range of features that can significantly reduce power consumption during operation. Key items include: • Alternate Run Modes: By clocking the controller from the Timer1 source or the internal RC oscilla- tor, power consumption during code execution can be reduced by as much as 90%. • Multiple Idle Modes: The controller can also run with its CPU core disabled but the peripherals still active. In these states, power consumption can be reduced even further, to as little as 4% of normal operation requirements. • On-the-Fly Mode Switching: The power-managed modes are invoked by user code during operation, allowing the user to incorporate power-saving ideas into their application’s software design. 1.1.2 OSCILLATOR OPTIONS AND FEATURES All of the devices in the PIC18F87J11 Family offer four different oscillator options, allowing users a range of choices in developing application hardware. These include: • Two Crystal modes, using crystals or ceramic resonators. • Two External Clock modes, offering the option of a divide-by-4 clock output. • An internal oscillator block which provides an 8 MHz clock and an INTRC source (approxi- mately 31 kHz, stable over temperature and VDD), as well as a range of 6 user-selectable clock frequencies, between 125 kHz to 4 MHz, for a total of 8 clock frequencies. This option frees an oscillator pin for use as an additional general purpose I/O. • A Phase Lock Loop (PLL) frequency multiplier, available to all of the oscillator modes, which allows a wide range of clock speeds from 16 MHz to 48 MHz The internal oscillator block provides a stable reference source that gives the family additional features for robust operation: • Fail-Safe Clock Monitor: This option constantly monitors the main clock source against a reference signal provided by the internal oscillator. If a clock failure occurs, the controller is switched to the internal oscillator, allowing for continued low-speed operation or a safe application shutdown. • Two-Speed Start-up: This option allows the internal oscillator to serve as the clock source from Power-on Reset, or wake-up from Sleep mode, until the primary clock source is available. 1.1.3 EXPANDED MEMORY The PIC18F87J11 family provides ample room for application code, from 64 Kbytes to 128 Kbytes of code space. The Flash cells for program memory are rated to last up to 10,000 erase/write cycles. Data retention without refresh is conservatively estimated to be greater than 20 years. The Flash program memory is readable, writable, and during normal operation, the PIC18F87J11 Family also provides plenty of room for dynamic application data with up to 3930 bytes of data RAM. 1.1.4 EXTERNAL MEMORY BUS In the event that 128 Kbytes of memory are inadequate for an application, the 80-pin members of the PIC18F87J11 Family also implement an External Mem- ory Bus (EMB). This allows the controller’s internal program counter to address a memory space of up to 2 Mbytes, permitting a level of data access that few 8-bit devices can claim. This allows additional memory options, including: • Using combinations of on-chip and external memory up to the 2-Mbyte limit • Using external Flash memory for reprogrammable application code or large data tables • Using external RAM devices for storing large amounts of variable data 1.1.5 EXTENDED INSTRUCTION SET The PIC18F87J11 Family implements the optional extension to the PIC18 instruction set, adding 8 new instructions and an Indexed Addressing mode. Enabled as a device configuration option, the extension has been specifically designed to optimize re-entrant application code originally developed in high-level languages, such as ‘C’. • PIC18F66J11 • PIC18F86J11 • PIC18F66J16 • PIC18F86J16 • PIC18F67J11 • PIC18F87J11 |
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