Features of the embedded device function include the following:

•Device Control Endpoint 0 and Interrupt Endpoints 1 and 2

–8-byte transmit buffer

–8-byte receive buffer

•Device Interrupt Endpoints 1 and 2

–8-byte transmit buffer

•USB generated interrupts

–transaction interrupt driven

9.3 Overview

This section provides an overview of the Universal Serial Bus (USB) module developed for the MC68HC(7)08KH12. This USB module is designed to serve as a compound device, and operates from a reference frequency of 48MHz, derived from the CGM (see Section 8. Clock Generator Module (CGM)). An embedded full speed device function is combined with a hub in a single USB module. For the hub sub-module, five basic properties can be supported by the hardware or the software: connectivity behavior, power management, device connect/disconnect detection, bus fault detection and recovery, and full/low speed device traffic control. Endpoint 0 of the hub sub-module functions as a receive/transmit control endpoint. Endpoint 1 of the hub sub-module functions as interrupt transfer to report the device change state. For the embedded device sub-module, three types of USB data transfers are supported: control, interrupt, and bulk (transmit only). Endpoint 0 of the embedded device sub-module functions as a receive/transmit control endpoint. Endpoints 1 and 2 of the embedded device sub-module can function as interrupt or bulk, but only in the transmit direction.

A block diagram of the USB module is shown Figure 9-1. The USB module manages communications between the host and the USB function. The module is partitioned into eight functional blocks. These blocks consist of a 3.3 volt regulator, a dual function transceiver, the hub repeater function, the SIE (Serial Interface Engine), the frame counter logic, the hub control logic, the embedded device control logic, and the endpoint registers.

MC68HC(7)08KH12 — Rev. 1.1

Advance Information

 

 

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MC68HC08KH12 specifications

The Freescale Semiconductor MC68HC08KH12 is a versatile microcontroller that has gained popularity in various embedded systems applications. Part of the HC08 family, this microcontroller combines a robust architecture with comprehensive on-chip features, making it suitable for a wide range of applications ranging from industrial control to consumer electronics.

One of the main features of the MC68HC08KH12 is its 8-bit architecture, which provides an optimal balance between performance and power efficiency. It operates at clock speeds of up to 2 MHz, allowing for efficient execution of instructions while maintaining low power consumption. The microcontroller is designed to operate over a voltage range of 2.7 to 5.5 volts, making it adaptable to various system requirements.

The MC68HC08KH12 is equipped with 1 Kbyte of RAM and 12 Kbytes of ROM, which allows for substantial program and data storage. The on-chip memory helps reduce the need for external components, simplifying the design of embedded systems and enhancing reliability. With a wide range of I/O options, including 26 general-purpose I/O pins, the microcontroller provides flexibility in interfacing with sensors, actuators, and other devices.

In terms of technologies, the MC68HC08KH12 features an advanced instruction set that enhances programming efficiency. It supports basic arithmetic operations, bit manipulation, and control transfer instructions, making it suitable for a variety of computational tasks. The integrated timers, analog-to-digital converters, and serial communication interfaces, including UART, provide the necessary tools for real-time control and data exchange with peripheral devices.

Another characteristic of the MC68HC08KH12 is its low power mode capabilities, which allow it to enter a sleep state during periods of inactivity. This feature is essential in battery-powered applications, where minimizing power consumption is crucial for extending operational life.

Overall, the Freescale Semiconductor MC68HC08KH12 stands out as a reliable microcontroller that combines performance, flexibility, and power efficiency. Its extensive features and technologies enable engineers to design robust embedded systems that meet the demands of modern applications. As a result, the MC68HC08KH12 remains a valuable choice for developers seeking a highly functional yet cost-effective microcontroller solution.
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