FM8PE56B : 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) 

FM8PE56B      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: 1.8V to 3.5V