GENERAL
The MC68HC05G3 (705G4) is an 80-pin microcontroller unit (MCU) with highly
sophisticated on-chip peripheral functions. The memory map of MC68HC05G3 (ROM
device) includes 24 Kbytes of user ROM and 768 bytes of RAM. The memory map of
MC68HC705G4 erasable programmable read-only memory (EPROM device) includes 32
Kbytes of user EPROM and 1 Kbyte of RAM. The MCU has nine ports: A, B, C, D, E, F, G,
H, and J. Ports A, C, D, E, G, and H each have eight input-output (I/O) pins, ports B and F
each have eight input-only pins, and port J has four output-only pins. The MC68HC05G3
includes a time-based circuit, 8- and 16-bit timers, an 8-bit pulse width modulator, a
computer operating properly (COP) watchdog timer, an 8-bit analog/digital (A/D) converter,
eight key wakeup interrupts, and two serial peripheral interfaces.

FEATURES
• Low Cost
• HC05 Core
• 80-Pin Quad Flat Package (QFP)
• 24,592 Bytes of Mask ROM or 32,784 Bytes of EPROM (Including 16
Bytes of User Vectors)
• 768 Bytes (ROM Device) or 1024 Bytes (EPROM Device) of On-Chip
RAM
• 48 Bidirectional I/O Lines, 16 Input-Only Lines, Four Output-Only Lines
• 16-Bit Timer with Output Compare and Input Capture
• 8-Bit Event Counter/Modulus Clock Divider
• COP Watchdog Timer
• Two Serial Peripheral Interfaces (SPI)
• Four Channels of 8-bit Pulse Width Modulator (PWM)
• Eight Channels of 8-Bit A/D Converter
• On-Chip Time-Based Circuits
• Dual Oscillators and Selectable System Clock Frequency
• Power-Saving Stop Mode/Wait Mode
• Time Base Interrupts
• Two IRQ Inputs
• Key Wakeup Interrupt with 8-Bit Inputs