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AM29243EH Fiches technique(PDF) 8 Page - Advanced Micro Devices |
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AM29243EH Fiches technique(HTML) 8 Page - Advanced Micro Devices |
8 / 36 page P R E L I M I N A R Y 8 Am29240 EH Microcontroller Series ™ during fly-by transfers. A higher fly-by DMA transfer can interrupt a lower fly-by transfer. Refresh does not pre-empt a fly-by transfer. A DMA transfer continues until either DREQx is deasserted, the transfer is interrupted by a higher priority DMA, or the Count Terminate Enable (CTE) bit is set. No refreshes will occur until the fly-by transfer is completed, so fly-by transfers must be less than one refresh interval in length. The DREQx signal must be configured as level- sensitive in the DRAM Control Register. Parity checking and generation cannot be performed during a fly-by transfer. Note also that zero-wait-state ROM cannot be used with fly-by DMA. I/O Port The I/O port permits direct access to 16 individually pro- grammable external input/output signals. Eight of these signals can be configured to cause interrupts. Parallel Port The parallel port implements a bidirectional IBM PC- compatible parallel interface to a host processor. Serial Port The serial port implements up to two full-duplex UARTs. Serializer/Deserializer The serializer/deserializer (video interface) on the Am29240EH and Am29245EH microcontrollers permits direct connection to a number of laser-marking engines, video displays, or raster input devices such as scanners. Interrupt Controller The interrupt controller generates and reports the status of interrupts caused by on-chip peripherals. Wide Range of Price/Performance Points To reduce design costs and time-to-market, the product designer can use the Am29200 microcontroller family and one basic system design as the foundation for an entire product line. From this design, numerous imple- mentations of the product at various levels of price and performance may be derived with minimum time, effort, and cost. The Am29240EH RISC microcontroller series supports this capability through various combinations of on-chip caches, programmable memory widths, programmable wait states, burst-mode and page-mode access sup- port, bus compatibility, and 29K family software compat- ibility. A system can be upgraded using various memory architectures without hardware and software redesign. The ROM controller accommodates memories that are either 8, 16, or 32 bits wide, and the DRAM controller ac- commodates dynamic memories that are 32 bits wide. This unique feature provides a flexible interface to low- cost memory, as well as a convenient, flexible upgrade path. For example, a system can start with a 16-bit ROM memory design and can subsequently improve perfor- mance by migrating to a 32-bit ROM memory design. One particular advantage is the ability to add memory in half-megabyte increments. This provides significant cost savings for applications that do not require larger memory upgrades. The Am29200, Am29202, Am29205, Am29240, Am29245, and Am29243EH microcontrollers allow us- ers to address an extremely wide range of cost perfor- mance points, with higher performance and lower cost than existing designs based on CISC microprocessors. Glueless System Interfaces The Am29240EH microcontroller series also minimizes system cost by providing a glueless attachment to exter- nal ROMs, DRAMs, and other peripheral components. Processor outputs have edge-rate control that allows them to drive a wide range of load capacitances with low noise and ringing. This eliminates the cost of external logic and buffering. Bus and Software Compatibility Compatibility within a processor family is critical for achieving a rational, easy upgrade path. Processors in the Am29240EH microcontroller series are all members of a bus-compatible family of RISC microcontrollers. All members of this family—the Am29205, Am29202, Am29200, Am29240, Am29245, and Am29243EH mi- crocontrollers—allow improvements in price, perfor- mance, and system capabilities without requiring that users redesign their system hardware or software. Bus compatibility ensures a convenient upgrade path for fu- ture systems. The Am29240EH microcontroller series is available in a 208-pin plastic quad flat-pack (PQFP) package. The Am29240EH microcontroller series is signal-compatible with the Am29200 and the Am29205 microcontrollers. Moreover, the Am29240EH microcontroller series is binary compatible with existing RISC microcontrollers and other members of the 29K family (the Am29000, Am29005, Am29030, Am29035, Am29040, and Am29050 microprocessors, as well as the Am29200, Am29202, and Am29205 microcontrollers). The Am29240EH microcontroller series provides a migra- tion path to low-cost, high-performance, highly inte- grated systems from other 29K family members, without requiring expensive rewrites of application software. Debugging and Testing The Am29240EH microcontroller series provides de- bugging and testing features at both the software and hardware levels. |
Numéro de pièce similaire - AM29243EH |
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Description similaire - AM29243EH |
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