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DESCRIPTION

The MC68HC05BD3 HCMOS microcontroller is a member of the M68HC05 Family of low-cost

single-chip microcontrollers. This 8-bit microcontroller unit (MCU) contains an on-chip oscillator,

CPU, RAM, ROM, parallel I/O capability with pins programmable as input or output, M-Bus serial

interface system (I2C), Pulse Width Modulator, Multi-Function Timer, and Sync Signal Processor.

These features make it particularly suitable as a multi-sync computer monitor MCU.

The MC68HC05BD5 is functionally equivalent to MC68HC05BD3, with increase RAM and ROM.

The MC68HC705BD3 is an EPROM version of the MC68HC05BD5. All references to the

MC68HC05BD3 apply equally to the MC68HC705BD3 and MC68HC05BD5, unless otherwise

stated. References specific to the MC68HC705BD3 are italicized in the text and also, for quick

reference, they are summarized in Section 14. References to MC68HC05BD5 are summarized in

Section 15.

Features

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

? Power saving Wait mode

? 128 bytes of on-chip RAM for MC68HC05BD3

256 bytes for MC68HC705BD3 and MC68HC05BD5

? 3.75K-bytes of user ROM for MC68HC05BD3

7.75K-bytes of user ROM for MC68HC05BD5

7.75K-bytes of user EPROM for MC68HC705BD3

? 24 bidirectional I/O lines: 14 dedicated and 10 multiplexed I/O lines.

4 of the 14 dedicated I/O lines and 6 of the MUXed I/O lines have +10V open-drain O/Ps.

? 16 channels PWM outputs: 8 dedicated, +10V open-drain PWM channels and

8 multiplexed with I/O lines of which 6 of them have +10V open-drain outputs.

? M-Bus Serial Interface (I2C-bus?)

? Multi-Function Timer (MFT) with Periodic Interrupt

? COP watchdog reset