M68HC08 datasheet(164/288 Pages) FREESCALE

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Universal Serial Bus Module (USB)

Data Sheet

MC68HC908BD48 — Rev. 2.1

164

Universal Serial Bus Module (USB)

Freescale Semiconductor

13.3 Features

Features of the USB (universal serial bus) module include the following:

•

Integrated 3.3-volt regulator with 3.3-volt output pin

•

Integrated USB transceiver supporting low-speed functions

•

USB data control logic

–

Packet decoding/generation

–

CRC (cyclic redundancy check) generation and checking

–

NRZI (non-return-to zero inserted) encoding/decoding

–

Bit-stuffing

•

USB reset support

•

Control endpoint 0 and interrupt endpoints 1 and 2

•

Two 8-byte transmit buffers

•

One 8-byte receive buffer

•

Suspend and resume operations

–

Remote wakeup support

•

USB generated interrupts

–

Transaction interrupt driven

–

Resume interrupt

–

End-of-pack (EOP) interrupt

•

STALL, NAK, and ACK handshake generation

13.4 I/O Pins

The USB module uses two I/O pins, shared with standard port I/O pins.

The full name of the USB I/O pins are listed in Table 13-1

. The generic

pin name appear in the text that follows.

Table 13-1. Pin Name Conventions

USB

Generic Pin Names:

Full MCU Pin Names:

Pin Selected for

USB Function By:

D+

PTD0/D+

USBD+E bit in PDCR ($0049)

D–

PTD1/D–

USBD–E bit in PDCR ($0049)

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