MC68HC05SR3 Datasheet, PDF (17/96 Pages) Freescale Semiconductor, Inc – High-density Complementary Metal Oxide Semiconductor (HCMOS) Microcontroller Units

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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.
The MC68HC705SR3 is an EPROM version of the MC68HC05SR3; it is available in windowed
and OTP packages. All references to the MC68HC05SR3 apply equally to the MC68HC705SR3,
unless otherwise stated. References specific to the MC68HC705SR3 are italicized in the text and
also, for quick reference, they are summarized in Appendix A.
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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 20KΩ pull-up resistors integrated into I/O ports
MC68HC05SR3
GENERAL DESCRIPTION
TPG
Freescale
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