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GENERAL DESCRIPTION

The MC68HC05SR3 HCMOS microcontroller is a member of the M68HC05 family of low-cost single-chip microcontrollers. This 8-bit microcontroller unit (MCU) contains on-chip oscillator, CPU, RAM, ROM, I/O, Timer, and Analog-to-Digital Converter. The MC68HC05SR3 is pin compatible with the MC6805R3 and is provided as a low power upgrade path for MC6805R3 applications. The low power advantage of CMOS is combined with the addition of I/O and port modifications which help eliminate external components in cost sensitive applications.

Features

? Fully static chip design featuring the industry standard 8-bit M68HC05 core

? Pin compatible with the MC6805R3

? Power saving STOP, WAIT, and SLOW modes

? 3840 bytes of user ROM with security feature in MC68HC05SR3 3840 bytes of EPROM with security bit in MC68HC705SR3

? 192 bytes of RAM (64 bytes for stack)

? 32 bidirectional I/O lines

? Keyboard interrupts

? 8-bit count-down timer with programmable 7-bit prescaler

? On-chip crystal oscillator, with built-in capacitor for RC option

? Second software programmable external interrupt line (IRQ2)

? Direct LED drive capability on all ports

? Programmable 20K? pull-up resistors integrated into I/O ports

? Internal 100K? pull-up resistors on IRQ and RESET pins

? Four channel 8-bit Analog to Digital Converter

? Low Voltage Reset

? Available in 40-pin PDIP, 42-pin SDIP and 44-pin QFP packages