Introduction The Motorola MC68HC705P6A is an EPROM version of the MC68HC05P6 microcontroller. It is a low-cost combination of an M68HC05 Family microprocessor with a 4-channel, 8-bit analog-to-digital (A/D) converter, a 16-bit timer with output compare and input capture, a serial communications port (SIOP), and a computer operating properly (COP) watchdog timer. The HC05 CPU core contains 176 bytes of RAM, 4672 bytes of user EPROM, 239 bytes of bootloader ROM, and 21 input/output (I/O) pins (20 bidirectional, 1 input-only). This device is available in a 28-pin SOIC, PDIP, or windowed DIP package. Features • Low Cost • HC05 Core • 28-Pin SOIC, PDIP, or Windowed DIP Package • 4672 Bytes of User EPROM (Including 48 Bytes of Page Zero EPROM and 16 Bytes of User Vectors) • 239 Bytes of Bootloader ROM • 176 Bytes of On-Chip RAM • 4-Channel 8-Bit A/D Converter • SIOP Serial Communications Port • 16-Bit Timer with Output Compare and Input Capture • 20 Bidirectional I/O Lines and 1 Input-Only line • PC0 and PC1 High-Current Outputs • Single-Chip, Bootloader, and Test Modes • Power-Saving Stop, Halt, and Wait Modes • Static EPROM Mask Option Register (MOR) Selectable Options: – COP Watchdog Timer Enable or Disable – Edge-Sensitive or Edge- and Level-Sensitive External Interrupt – SIOP Most Significant Bit (MSB) or Least Significant Bit (LSB) First – SIOP Clock Rates: OSC Divided by 8, 16, 32, or 64 – Stop Instruction Mode, STOP or HALT – EPROM Security External Lockout – Programmable Keyscan (Pullups/Interrupts) on PA0–PA7
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