131

TPSIZ3-TPSIZ0 — HUB Endpoint 0 Transmit Data Packet Size

These read/write bits store the number of transmit data bytes for the next IN token request for HUB Endpoint 0. These bits are cleared by reset.

9.4.8 USB HUB Endpoint1 Control & Data Register (HCDR)

Address:

Read:

Write:

Reset:

$005C
Bit 7	6	5	4	3	2	1	Bit 0

STALL1	PNEW	PCHG5	PCHG4	PCHG3	PCHG2	PCHG1	PCHG0

0	0	0	0	0	0	0	0

Figure 9-9. USB HUB Control Register 1 (HCR1)

STALL1 — HUB Endpoint 1 Force Stall Bit

This read/write bit causes HUB Endpoint 1 to return a STALL handshake when polled by the host. Reset clears this bit.

1 = Send STALL handshake

0 = Default

PNEW — Port New Status Change

This read/write bit enables a transmit to occur when the USB Host controller sends an IN token to HUB Endpoint 1. Software should set this bit when there is any status change on the downstream ports, embedded device or hub. It must be cleared by software when there is no status change needs to be reported to the host through the Endpoint1. If this bit is 0, a NAK handshake will be returned for next IN token for HUB Endpoint 1. Reset clears this bit.

1 = Port status change bit is ready to be sent.

0 = Port status does not change. Respond with NAK.

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

Freescale Semiconductor	131

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 HUB Control Register 1 HCR1, 131

Models: MC68HC08KH12

Figure 9-9. USB HUB Control Register 1 (HCR1)

MC68HC08KH12 specifications