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FM8PB56B : OTP device
Only 42 single word instructions All instructions are single cycle except for program branches which are two-cycle 13-bit wi de instructions All OTP area GOTO instruction All OTP 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 Device Pins # I/O # OTP (Byte) RAM (Byte) FM8PB56B 18 16 1K 49 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 reli able operation and soft-ware watch-dog enable/disable control Two I/O ports IOA and IOB with i ndependent 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 Built-in 8 MHz, 4 MHz, 1 MHz, and 455 KHz internal RC oscillator Programmable Code Protection Selectable oscillator options: - ERC: External Resistor/Capacitor Oscillator - HF: High Frequency Crystal/Resonator Oscillator - XT: Crystal/Resonator Oscillator - LF: Low Frequency Crystal Oscillator - IRC: Internal Resistor/Capacitor Oscill ator - ERIC: External Resistor/Internal Capacitor Oscillator Operating voltage range: 2.0V to 5.5V - ≤4MHz: 2.0V to 5.5V - ≤8MHz: 2.4V to 5.5V, see 6.1 for more information.