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Only 42 single word instructions
All instructions are single cycle except for program branches which are two-cycle
13-bit wi de instructions
All EPROM area GOTO instruction
All EPROM area subroutine CALL instruction
8-bit wide data path
5-level deep hardware stack
Operating speed: DC-20 MHz clock inpu
DC-100 ns instruction cycle

Device
Pins #
I/O #
EPROM (Word)
RAM (Byte)
FM8PB513B
8
6
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
One I/O port 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
Built-in 8MHz, 4MHz, 1MHz, and 455KHz 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
Wide-operating voltage range: 2.0V to 5.5V