GENERAL DESCRIPTION

The MC68HC05JB3 is a member of the low-cost, high-performance M68HC05

Family of 8-bit microcontroller units (MCUs). The M68HC05 Family is based on

the customer-specified integrated circuit design strategy. All MCUs in the family

use the popular M68HC05 central processing unit (CPU) and are available with a

variety of subsystems, memory sizes and types, and package types.

The MC68HC05JB3 is specifically designed to be used in applications where a

low speed (1.5Mbps) Universal Serial Bus (USB) interface is required.

FEATURES

• Industry standard M68HC05 CPU core

• Memory-mapped input/output (I/O) registers

• 2560 Bytes of user ROM

• 144 Bytes of user RAM (includes 64 byte stack)

• Fully compliant Low Speed USB with 3 Endpoints:

– 1 Control Endpoint (2

´

8-byte buffer)

– 2 Interrupt Endpoints (1

´

8-byte buffer shared)

• 3.3V dc output for USB pull-up resistors

• 19 Bidirectional I/O pins with the following features:

– 17 I/Os have software programmable pull-down capability

– 2 open-drain I/Os have software programmable pull-up, 25mA current

sink capability

– 4 I/Os with external interrupt capability

– 8 I/Os (in 4 pairs) with programmable optical interface

• Multi-Function Timer (MFT)

• 16-bit Timer with 1 input capture and 1 output compare

• Low Voltage Reset (LVR)

• Computer Operating Properly (COP) Watchdog Reset

• Illegal Address Reset

• Power-Saving STOP and WAIT Modes

• Available in 20-pin PDIP, 20-pin SOIC, 28-pin PDIP, and 28-pin SOIC

packages