产品描述：
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.