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參數(shù)資料
| 型號(hào)： | MC68HC08KH12A |
| 廠商： | 飛思卡爾半導(dǎo)體(中國(guó))有限公司 |
| 英文描述： | Microcontrollers |
| 中文描述： | 微控制器 |
| 文件頁(yè)數(shù)： | 80/178頁(yè) |
| 文件大?。?/td> | 925K |
| 代理商： | MC68HC08KH12A |
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Universal Serial Bus Module (USB)
MC68HC08KH12A Data Sheet, Rev. 1.1
80
Freescale Semiconductor
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
MC68HC08KH12A. This USB module is designed to serve as a compound device, and operates from a
reference frequency of 48MHz, derived from the CGM (see
Chapter 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.
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