Features
• Low-cost HC05 core
• 16-pin PDIP, 16-pin SOIC package, or 20-pin SSOP
• 928 bytes of user ROM, including eight bytes of user vectors
• 64 bytes of user RAM
• Low-power operation at 1.8 V — VDD minimum (EEPROM read
only)
• 128 bits of personality EEPROM (not memory mapped)
programmed using CPU software or with on-chip serial
programming ROM
• On-chip charge pump for in-circuit programming of the personality
EEPROM at 2.7 to 5.5 Vdc
• 8-bit free-running timer
• 4-stage selectable real-time interrupt generator
• 10 bidirectional input/output (I/O) lines including:
– 8-mA sink capability on four I/O pins (PA7–PA4)
– Mask option for software programmable pulldowns on all I/O
pins
– Mask option for port interrupts on four I/O pins (PA3–PA0)
(keyboard scan feature)
• IRQ interrupt hardware mask, flag bit, and request bit
• Mask option for sensitivity on IRQ interrupt (edge- and
level-sensitive or edge-sensitive only)
• On-chip oscillator (mask options for crystal/ceramic resonator
oscillator with internal 2-MW resistor and 2-pin or 3-pin resistor
capacitor (RC) oscillator)
• Mask option for reduced startup delay time with RC oscillator
options
• Mask option for computer operating properly (COP) watchdog
system
• Power-saving stop mode and wait mode instructions
• Mask option to convert STOP instruction to halt mode
• Illegal address reset
• Internal steering diode and pullup resistor on RESET pin to VDD
• Internal RESET pin pulldown from COP watchdog and ILADR