MC68HC908LD64 Datasheet, PDF (188/362 Pages) Freescale Semiconductor, Inc – Microcontrollers

Universal Serial Bus Module (USB)
14.2 Introduction
This section describes the Universal Serial Bus (USB) module. This
MC68HC908LD64’s USB module supports both embedded full-speed
device and hub functions with one upstream port and four downstream
ports.
14.3 Features
Data Sheet
188
Features of the USB module include the following:
• Integrated USB transceiver supporting both full-speed and
low-speed functions
• USB data control logic
– Packet decoding/generation
– CRC generation and checking
– NRZI encoding/decoding
– Bit-stuffing
• USB reset support
• Suspend and resume operations
• Remote wakeup support
• STALL, NAK, and ACK handshake generation
Features of the hub function include the following:
• Hub control endpoint 0
– 8-byte transmit buffer
– 8-byte receive buffer
• Hub interrupt endpoint 1
– 1-byte transmit buffer
• USB interrupts
– Transaction interrupt driven
– Start of frame interrupt
Universal Serial Bus Module (USB)
MC68HC908LD64 — Rev. 3.0
Freescale Semiconductor