1 = The data buffers are used for embedded device Endpoint 2 0 = The data buffers are used for embedded device Endpoint 1

TX1E — Embedded Device Endpo int 1/2 Transmit Enable

This read/write bit enables a transmit to occur when the USB Host controller sends an IN token to Endpoint 1 or Endpoint 2 of the embedded device. The appropriate endpoint enable bit, ENABLE1 or ENABLE2 bit in the DCR2 register, should also be set. Software should set the TX1E bit when data is ready to be transmitted. It must be cleared by software when no more data needs to be transmitted.

If this bit is 0 or the TXD1F is set, the USB will respond with a NAK handshake to any Endpoint 1 or Endpoint 2 directed IN tokens. Reset clears this bit.

1 = Data is ready to be sent.

0 = Data is not ready. Respond with NAK.

TP1SIZ3-TP1SIZ0 — Em bedded Device Endpoint 1/2 Transmit Data

Packet Size

These read/write bits store the number of transmit data bytes for the next IN token request for embedded device Endpoint 1 or Endpoint 2. These bits are cleared by reset.

9.5.6 USB Embedded Device Status Register (DSR)

Address:

Read:

Write:

Reset:

$004D

 

 

 

 

 

 

 

Bit 7

6

5

4

3

2

1

Bit 0

 

 

 

 

 

 

 

 

DRSEQ

DSETUP

DTX1ST

0

RP0SIZ3

RPS0IZ2

RP0SIZ1

RP0SIZ0

 

 

 

 

 

 

 

 

 

 

 

DTX1STR

 

 

 

 

 

 

 

 

 

 

 

 

X

X

0

0

X

X

X

X

 

= Unimplemented

 

X = Indeterminate

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 9-17. USB Embedded Device Status Register (DSR)

Advance Information

MC68HC(7)08KH12 Rev. 1.1

 

 

144

Freescale Semiconductor

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Freescale Semiconductor MC68HC08KH12 manual USB Embedded Device Status Register DSR, 144

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.