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AM186EM Arkusz danych(PDF) 10 Page - Advanced Micro Devices |
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AM186EM Arkusz danych(HTML) 10 Page - Advanced Micro Devices |
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10 / 98 page  10 Am186/188EM and Am186/188EMLV Microcontrollers PRELIMINA R Y KEY FEATURES AND BENEFITS The Am186EM and Am188EM microcontrollers extend the AMD family of microcontrollers based on the indus- try-standard x86 architecture. The Am186EM and Am188EM microcontrollers are higher-performance, more integrated versions of the 80C186/188 micropro- cessors, offering a migration path that was previously unava ilabl e. Upgr adi ng to the Am 186EM and Am188EM microcontrollers is an attractive solution for several reasons: n Minimized total system cost—New peripherals and on-chip system interface logic on the Am186EM and Am188EM 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. n Enhanced performance—The Am186EM and Am188EM microcontrollers increase the perfor- mance of 80C186/188 systems, and the demulti- plexed address bus offers faster, unbuffered access to memory. n Enhanced functionality—The new and enhanced on-chip peripherals of the Am186EM and Am188EM microcontrollers include an asynchronous serial port, 32 PIOs, a watchdog timer, an additional inter- rupt pin, a synchronous serial interface, a PSRAM controller, a 16-bit reset configuration register, and enhanced chip-select functionality. Application Considerations The integration enhancements of the Am186EM and Am188EM microcontrollers provide a high-perfor- mance, low-system-cost solution for 16-bit embedded microcontroller designs. The nonmultiplexed address bus eliminates the need for system-support logic to in- terface memory devices, while the multiplexed ad- dress/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 per- formance with reduced system cost. Clock Generation The integrated clock generation circuitry of the Am186EM and Am188EM microcontrollers allows the use of a times-one crystal frequency. The design in Figure 1 achieves 40-MHz CPU operation while using a 40-MHz crystal. Memory Interface The int egrat ed m em ory co ntrolle r lo gic o f the Am186EM and Am188EM microcontrollers provides a direct address bus interface to memory devices. The use of an external address latch controlled by the ad- dress latch enable (ALE) signal is no longer needed. Individual byte-write-enable signals are provided to eliminate the need for external high/low byte-write-en- able circuitry. The maximum bank size that is program- mable 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 Am186EM and Am188EM 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. Direct Memory Interface Example Figure 1 illustrates the Am186EM microcontroller direct memory interface. The processor A19–A0 bus con- nects to the memory address inputs, the AD bus con- nects to the data inputs and outputs, and the chip selects connect to the memory chip-select inputs. The RD output connects to the SRAM Output Enable (OE) pin for read operations. Write operations use the byte write enables connected to the SRAM Write Enable (WE) pins. The example design uses 2-Mbit memory technology (256 Kbytes) to fully populate the available address space. Two flash PROM devices provide 512 Kbytes of nonvolatile program storage and two static RAM de- vices provide 512 Kbytes of data storage area. 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. Example System Design X2 X1 RS-232 Level Converter TXD RXD LCS UCS WHB WLB WE RD WE OE CS WE AD15 –AD0 A19 –A0 Flash PROM Static RAM Serial Port Am186EM Microcontroller 40-MHz Crystal Address Data WE Data OE CS Address |
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