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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