产品描述：
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