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FM8P56E解密

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    关于FM8P56E
    The FM8P54/56 series is a family of low-cost, high speed, high noise immunity, EPROM/ROM-based 8-bit CMOS microcontrollers. It employs a RISC architecture with only 42 instructions. All instructions are single cycle except for program branches which take two cycles. The easy to use and easy to remember instruction set reduces development time significantly.
  The FM8P54/56 series consists of Power-on Reset (POR), Brown-out Reset (BOR), Power-up Reset Timer (PWRT),Oscillator Start-up Timer(OST), Watchdog Timer, EPROM/ROM, SRAM, tri-state I/O port, I/O pull-high/open-drain/pull-down control, Power saving SLEEP mode, real time programmable clock/counter,Interrupt, Wake-up from SLEEP mode, and Code Protection for EPROM products. There are four oscillator configurations to choose from, including the power-saving LP (Low Power) oscillator and cost saving RC oscillator.
  The FM8P54/54E address 512×13 of program memory, and the FM8P56/56E address 1K×13 of program memory. The FM8P54/56 can directly or indirectly address its register files and data memory. All special function registers including the program counter are mapped in the data memory.
  FM8P56E FEATURES
  Only 42 single word instructions
  All instructions are single cycle except for program branches which are two-cycle
  13-bit wide instructions
  All ROM/EPROM area GOTO instruction
  All ROM/EPROM area subroutine CALL instruction
  8-bit wide data path
  5-level deep hardware stack
  Operating speed: DC-20 MHz clock input
  DC-100 ns instruction cycle
  Direct, indirect addressing modes for data accessing
  8-bit real time clock/counter (Timer0) with 8-bit programmable prescaler
  Internal Power-on Reset (POR)
  Built-in Low Voltage Detector (LVD) for Brown-out Reset (BOR)
  Power-up Reset Timer (PWRT) and Oscillator Start-up Timer(OST)
  On chip Watchdog Timer (WDT) with internal oscillator for reliable operation and soft-ware watch-dog enable/disable control
  Two I/O ports IOA and IOB with independent direction control
  Soft-ware I/O pull-high/pull-down or open-drain control
  One internal interrupt source: Timer0 overflow; Two external interrupt source: INT pin, Port B input change
  Wake-up from SLEEP by INT pin or Port B input change
  Power saving SLEEP mode
  Programmable Code Protection
  Selectable oscillator options:
  - ERC: External Resistor/Capacitor Oscillator
  - XT: Crystal/Resonator Oscillator
  - HF: High Frequency Crystal/Resonator Oscillator
  - LF: Low Frequency Crystal Oscillator
  Wide-operating voltage range:
  - EPROM : 2.3V to 5.5V
  - ROM : 2.3V to 5.5V