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AM186ESLV Folha de dados(PDF) 10 Page - Advanced Micro Devices |
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AM186ESLV Folha de dados(HTML) 10 Page - Advanced Micro Devices |
10 / 102 page 10 Am186/188ES and Am186/188ESLV Microcontrollers PRELIMIN ARY KEY FEATURES AND BENEFITS The Am186ES and Am188ES microcontrollers extend the AMD family of microcontrollers based on the industry-standard x86 architecture. The Am186ES and Am188ES microcontrollers are higher-performance, m o r e int egr at ed ver s io ns o f th e 80C 186 /18 8 microprocessors, offering an attractive migration path. I n add ition , th e Am 186 ES a nd Am18 8ES microcontrollers offer application-specific features that can enhance the system functionality of the Am186EM and Am188EM microcontrollers. Upgrading to the Am186ES and Am188ES microcontrollers is an attractive solution for several reasons: n Minimized total system cost—New peripherals and on-chip system interface logic on the Am186ES and Am188ES microcontrollers reduce the cost of existing 80C186/188 designs. n x86 software compatibility—80C186/188-com- patible and upward-compatible with the other mem- bers of the AMD E86 family. The x86 architecture is the most widely used and supported computer ar- chitecture in the world. n Enhanced performance—The Am186ES and Am188ES microcontrollers increase the perfor- mance of 80C186/188 systems, and the nonmulti- plexed address bus offers faster, unbuffered access to memory. n Enhanced functionality—The new and enhanced on-chip peripherals of the Am186ES and Am188ES microcontrollers include two asynchronous serial ports, 32 PIOs, a watchdog timer, additional inter- rupt pins, a pulse width demodulation option, DMA directly to and from the serial ports, 8-bit and 16-bit static bus sizing, a PSRAM controller, a 16-bit reset configuration register, and enhanced chip-select functionality. Application Considerations The integration enhancements of the Am186ES and Am 188ES micr ocon tr olle r s pr ovid e a hig h - performance, low-system-cost solution for 16-bit e mbed ded m icr ocont r o ller de signs. Th e nonmultiplexed address bus eliminates the need for system-support logic to interface memory devices, while the multiplexed address/data bus maintains the value of previously engineered, customer-specific peripherals and circuits within the upgraded design. Figure 1 illustrates an example system design that uses the integrated peripheral set to achieve high performance with reduced system cost. Clock Generation The integrated clock generation circuitry of the Am186ES and Am188ES microcontrollers allows the use of a times-one crystal frequency. The design shown in Figure 1 achieves 40-MHz CPU operation, while using a 40-MHz crystal. Memory Interface The int egra ted m em ory co ntroller lo gic o f th e Am186ES and Am188ES microcontrollers provides a direct address bus interface to memory devices. It is not necessary to use an external address latch controlled by the address latch enable (ALE) signal. Individual byte-write-enable signals eliminate the need for external high/low byte-write-enable circuitry. The maximum bank size that is programmable for the memory chip-select signals has been increased to facilitate the use of high-density memory devices. The improved memory timing specifications for the Am186ES and Am188ES microcontrollers allow no- wait-state operation with 70-ns memory access times at a 40-MHz CPU clock speed. This reduces overall system cost significantly by allowing the use of a more commonly available memory speed and technology. Figure 1 also shows an implementation of an RS-232 console or modem communications port. The RS-232- to-CMOS voltage-level converter is required for the electrical interface with the external device. Figure 1. Am186ES Microcontroller Example System Design Direct Memory Interface Example Figure 1 illustrates the Am186ES microcontroller’s direct memory interface. The processor A19–A0 bus connects to the memory address inputs, the AD bus X2 X1 RS-232 Level Converter Serial Port 0 LCS UCS WHB WLB WE Address Data OE CS WE RD WE Address Data OE CS WE AD15–AD0 A19–A0 Flash PROM Static RAM Am186ES Microcontroller 40-MHz Crystal Serial Port 1 PW PWD Input |
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Descrição semelhante - AM186ESLV |
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