141

1 = Transmit on Endpoint 1 or Endpoint 2 of the embedded device has occurred

0 = Transmit on Endpoint 1 or Endpoint 2 of the embedded device has not occurred

TXD1IE — Embedded Device Endpoint 1/2 Transmit Interrupt Enable

This read/write bit enables the USB to generate CPU interrupt requests when the shared Transmit Endpoint 1/2 interrupt flag bit of the embedded device (TXD1F) becomes set. Reset clears the TXD1IE bit.

1 = Transmit embedded device Endpoints 1 and 2 can generate a CPU interrupt request

0 = Transmit embedded device Endpoints 1 and 2 cannot generate a CPU interrupt request

TXD1FR — Embedded Device Endpoi nt 1/2 Transmit Flag Reset

Writing a logic 1 to this write only bit will clear the TXD1F bit if it is set.

Writing a logic 0 to TXD1FR has no effect. Reset clears this bit.

9.5.4 USB Embedded Device Control Register 0 (DCR0)

Address:

Read:

Write:

Reset:

$004B
Bit 7	6	5	4	3	2	1	Bit 0

T0SEQ	DSTALL0	TX0E	RX0E	TP0SIZ3	TP0SIZ2	TP0SIZ1	TP0SIZ0

0	0	0	0	0	0	0	0

Figure 9-15. USB Embedded Device Control Register 0 (DCR0)

T0SEQ — Embedded Device Endpoi nt 0 Transmit Sequence Bit

This read/write bit determines which type of data packet (DATA0 or DATA1) will be sent during the next IN transaction directed at Endpoint 0. Toggling of this bit must be controlled by software. Reset clears this bit.

MC68HC(7)08KH12 — Rev. 1.1	Advance Information

Freescale Semiconductor	141

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.

Freescale Semiconductor MC68HC08KH12 manual USB Embedded Device Control Register 0 DCR0, 141

Models: MC68HC08KH12

Figure 9-15. USB Embedded Device Control Register 0 (DCR0)

MC68HC08KH12 specifications