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HMS99C54S Datasheet(PDF) 6 Page - List of Unclassifed Manufacturers |
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HMS99C54S Datasheet(HTML) 6 Page - List of Unclassifed Manufacturers |
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6 / 73 page  HMS99C51S/52S/54S/56S/58S 2 Sep. 2004 Ver 1.01 FEATURE • Fully compatible to standard MCS-51 microcontroller • Wide operating frequency up to 40MHz (for more detail, See “HMS99C51S/52S/54S/56S/58S SELECTION GUIDE” on page 1) • X2 Speed Improvement capability (X2 Mode : 6 clocks/machine cycle) 20MHz @5V (Equivalent to 40MHz @5V) • ISP(In-System Programming) using Standard VCC Power Supply • Boot ROM Contains Low Level FLASH Programming Routines and a Default Serial Loader • 4K/8K/16K/24K/32K bytes FLASH user program memory - Byte Write and Block(2K, 8K Bytes) Erase • 2K bytes FLASH boot loader • 1 byte Hardware Security Byte (HSB) • 256 bytes RAM • 64K bytes external program memory space • 64K bytes external data memory space • Four 8-bit ports • Three 16-bit Timers / Counters (Timer2 with up/down counter feature) •UART • One clock output port • Programmable ALE pin enable / disable (Low EMI) • Six interrupt sources, two priority levels • Power saving Idle and power down mode • P-DIP-40, P-LCC-44, P-MQFP-44 package • Temperature Ranges : -40 °C ~ 85°C Description The Flash memory increases EPROM and ROM functionality with in-circuit electrical erasure and program- ming. It contains 4K, 8K, 16K, 24K or 32K bytes of program memory. This memory is both parallel and serial In-System Programmable(ISP). The ISP allows devices to alter their own program memory in the actual end product under software control through UART ports. A default serial loader(bootloader) program supports ISP of the Flash memory. The programming does not require external 12V programming voltage. The necessary high programming voltage is generated on-chip using the standard VCC pins of the microcontroller. |
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