Devices Included in this Data Sheet:
‧ CMD78P447AE : 28-pin EPROM device
‧ CMD78P447BE : 32-pin EPROM device
‧ CMD78P447A : 28-pin Mask ROM device
‧ CMD78P447B : 32-pin Mask ROM device
FEATURES
‧ Only 47 single word instructions
‧ All instructions are single cycle except for program branches which are two-cycle
‧ 13-bit wide instructions
‧ All ROM/EPROM area GOTO/FGOTO instruction
‧ All ROM/EPROM area subroutine CALL/FCALL instruction
‧ 8-bit wide data path
‧ 5-level deep hardware stack
‧ 4K x 13 bits on chip EPROM/ROM
‧ 144 x 8 bits on chip general purpose registers (SRAM)
‧ Operating speed: DC-20 MHz clock input
DC-100 ns instruction cycle
‧ 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 reliable operation and soft-ware watch-dog
enable/disable control
‧ Three I/O ports IOA, IOB and IOC with independent direction control
‧ 16 soft-ware control pull-high pins: Port B/Port C
‧ 8 soft-ware control pull-down pins:IOA0~A3/IOB0~B3
‧ 2 soft-ware control open-drain pins: IOC6/IOC7
‧ One internal interrupt source: Timer0 overflow; Two external interrupt source: INT0 pin, INT1 pin
‧ Wake-up from SLEEP by Port B/IOC4/IOC5 input falling
‧ Power saving SLEEP mode
‧ Programmable Code Protection
‧ Selectable oscillator options:
- ERC: External Resistor/Capacitor Oscillator
- XT: Crystal/Resonator Oscillator
- HF: High Frequency Crystal/Resonator Oscillator
- LF: Low Frequency Crystal Oscillator
‧ Wide-operating voltage range:
- EPROM : 2.3V to 5.5V
- ROM : 2.3V to 5.5V