GENERAL DESCRIPTION

The MC68HC705JB2 is a member of the low-cost, high-performance MC68HC05

Family of 8-bit microcontroller units (MCUs). The MC68HC05 Family is based on

the Customer-Specified Integrated Circuit (CSIC) design strategy. All MCUs in the

family use the popular MC68HC05 central processing unit (CPU) and are

available with a variety of subsystems, memory sizes and types, and package

types. The MC68HC705JB2 is specifically designed to be used in applications

where a Universal Serial Bus (USB) interface is required.

FEATURES

• Industry standard M68HC05 CPU core

• Memory-mapped Input/Output (I/O) registers

• 2048 Bytes of user EPROM

• 128 Bytes of user RAM

• Fully compliant Low Speed USB with 3 Endpoints:

– 1 Control Endpoint (2 x 8-byte buffer)

– 2 Interrupt Endpoints (1 x 8-byte buffer shared)

• 3.3Volt dc output pin for USB pullup resistors

• Multi-Function Timer

• 16-Bit Input Capture/Output Compare Timer

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

– 9 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

• Low Voltage Reset (LVR) circuit

• Power saving STOP and WAIT Modes

• Available in 20-Pin PDIP and 20-pin SOIC packages