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PIC17CR42T Datasheet(PDF) 5 Page - Microchip Technology |
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PIC17CR42T Datasheet(HTML) 5 Page - Microchip Technology |
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5 / 240 page  © 1996 Microchip Technology Inc. DS30412C-page 5 PIC17C4X 1.0 OVERVIEW This data sheet covers the PIC17C4X group of the PIC17CXX family of microcontrollers. The following devices are discussed in this data sheet: • PIC17C42 • PIC17CR42 • PIC17C42A • PIC17C43 • PIC17CR43 • PIC17C44 The PIC17CR42, PIC17C42A, PIC17C43, PIC17CR43, and PIC17C44 devices include architec- tural enhancements over the PIC17C42. These enhancements will be discussed throughout this data sheet. The PIC17C4X devices are 40/44-Pin, EPROM/ROM-based members of the versatile PIC17CXX family of low-cost, high-performance, CMOS, fully-static, 8-bit microcontrollers. All PIC16/17 microcontrollers employ an advanced RISC architecture. The PIC17CXX has enhanced core features, 16-level deep stack, and multiple internal and external interrupt sources. The separate instruction and data buses of the Harvard architecture allow a 16-bit wide instruction word with a separate 8-bit wide data. The two stage instruction pipeline allows all instructions to execute in a single cycle, except for program branches (which require two cycles). A total of 55 instructions (reduced instruction set) are available in the PIC17C42 and 58 instructions in all the other devices. Additionally, a large register set gives some of the architectural innovations used to achieve a very high performance. For mathematical intensive applica- tions all devices, except the PIC17C42, have a single cycle 8 x 8 Hardware Multiplier. PIC17CXX microcontrollers typically achieve a 2:1 code compression and a 4:1 speed improvement over other 8-bit microcontrollers in their class. PIC17C4X devices have up to 454 bytes of RAM and 33 I/O pins. In addition, the PIC17C4X adds several peripheral features useful in many high performance applications including: • Four timer/counters • Two capture inputs • Two PWM outputs • A Universal Synchronous Asynchronous Receiver Transmitter (USART) These special features reduce external components, thus reducing cost, enhancing system reliability and reducing power consumption. There are four oscillator options, of which the single pin RC oscillator provides a low-cost solution, the LF oscillator is for low frequency crystals and minimizes power consumption, XT is a standard crystal, and the EC is for external clock input. The SLEEP (power-down) mode offers additional power saving. The user can wake-up the chip from SLEEP through several external and internal interrupts and device resets. There are four configuration options for the device oper- ational modes: • Microprocessor • Microcontroller • Extended microcontroller • Protected microcontroller The microprocessor and extended microcontroller modes allow up to 64K-words of external program memory. A highly reliable Watchdog Timer with its own on-chip RC oscillator provides protection against software mal- function. Table 1-1 lists the features of the PIC17C4X devices. A UV-erasable CERDIP-packaged version is ideal for code development while the cost-effective One-Time Programmable (OTP) version is suitable for production in any volume. The PIC17C4X fits perfectly in applications ranging from precise motor control and industrial process con- trol to automotive, instrumentation, and telecom appli- cations. Other applications that require extremely fast execution of complex software programs or the flexibil- ity of programming the software code as one of the last steps of the manufacturing process would also be well suited. The EPROM technology makes customization of application programs (with unique security codes, combinations, model numbers, parameter storage, etc.) fast and convenient. Small footprint package options make the PIC17C4X ideal for applications with space limitations that require high performance. High speed execution, powerful peripheral features, flexible I/O, and low power consumption all at low cost make the PIC17C4X ideal for a wide range of embedded con- trol applications. 1.1 Family and Upward Compatibility Those users familiar with the PIC16C5X and PIC16CXX families of microcontrollers will see the architectural enhancements that have been imple- mented. These enhancements allow the device to be more efficient in software and hardware requirements. Please refer to Appendix A for a detailed list of enhancements and modifications. Code written for PIC16C5X or PIC16CXX can be easily ported to PIC17CXX family of devices (Appendix B). 1.2 Development Support The PIC17CXX family is supported by a full-featured macro assembler, a software simulator, an in-circuit emulator, a universal programmer, a “C” compiler, and fuzzy logic support tools. This document was created with FrameMaker404 |
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