PCHG5-PCHG0 — HUB and Po rt Status Change Bits

These read/write bits report the status change for the Hub, embedded device and the four downstream ports. The Status Change Bitmap is returned to the host through the HUB endpoint 1 if the bit PNEW is 1. These bits are cleared by reset.

Bit Name

Function

Value

Description

 

 

 

 

PCHG0

HUB status change

0

No status change in HUB

 

 

1

HUB status change detected

 

 

 

 

 

 

PCHG1

Port 1 status change

0

No status change in Port 1

 

 

1

Port 1 status change detected

 

 

 

 

 

 

PCHG2

Port 2 status change

0

No status change in Port 2

 

 

1

Port 2 status change detected

 

 

 

 

 

 

PCHG3

Port 3 status change

0

No status change in Port 3

 

 

1

Port 3 status change detected

 

 

 

 

 

 

PCHG4

Port 4 status change

0

No status change in Port 4

 

 

1

Port 4 status change detected

 

 

 

 

 

 

 

 

0

No status change in

 

Embedded device

embedded device

PCHG5

 

 

 

status change

1

Embedded device status

 

 

 

 

 

change detected

 

 

 

 

 

 

 

9.4.9 USB HUB Status Register (HSR)

Address:

Read:

Write:

Reset:

$005D

 

 

 

 

 

 

 

Bit 7

6

5

4

3

2

1

Bit 0

 

 

 

 

 

 

 

 

RSEQ

SETUP

TX1ST

0

RPSIZ3

RPSIZ2

RPSIZ1

RPSIZ0

 

 

 

 

 

 

 

 

 

 

 

TX1STR

 

 

 

 

 

 

 

 

 

 

 

 

X

X

0

0

X

X

X

X

 

= Unimplemented

 

X = Indeterminate

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 9-10. USB HUB Status Register (HSR)

Advance Information

MC68HC(7)08KH12 Rev. 1.1

 

 

 

 

132

Freescale Semiconductor

Page 132
Image 132
Freescale Semiconductor MC68HC08KH12 manual USB HUB Status Register HSR, 132

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.