●Introduction
●The 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 M68HC05 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 either a 28-pin plastic dual in-line (PDIP) or a 28-pin small outline integrated circuit (SOIC) package.
●Features
●Features of the MC68HC705P6A include:
●• Low cost
●• M68HC05 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
