7643 datasheet(59/424 Pages) RENESAS

59 / 424 page

Rev.2.00

Aug 28, 2006

page 42 of 103

REJ09B0133-0200

OVERVIEW

FUNCTIONAL DESCRIPTION

7643 Group

USB FUNCTION

The 7643 Group MCU is equipped with a USB Function Control

Unit (USB FCU). This USB FCU allows the MCU to communicate

with a host PC using a minimum amount of the MCU power. This

built-in USB FCU complies with Full-Speed USB2.0 specification

that supports four transfer types: Control Transfer, Isochronous

Transfer, Interrupt Transfer, and Bulk Transfer. However, the 7643

Group can use three of Control Trasnfer, Interrupt Transfer and

Bulk Transfer. This built-in USB FCU performs the data transfer

error detection and transfer retry operation by hardware. The de-

fault transfer mode of the USB FCU is bulk transfer mode at reset.

The user must set the USB FCU for the required transfer mode by

software.

The USB FCU has three endpoints (Endpoint 0 to Endpoint 2).

The EPINDEX bit selects one of these five endpoints for the USB

FCU to use. Each endpoint has IN (transmit) FIFO and OUT (re-

ceive) FIFO. To use the USB FCU, the USB enable bit (USBC7)

must be set to “1”. The USB Function Interrupt is supported for

this MCU.

Figure 34 shows the USB FCU (USB Function Control Unit) block

diagram. The USB FCU consists of the SIE (Serial Interface En-

gine) performing the USB data transfer, GFI (Generic Function

Interface) performing USB protocol handing, SIU (Serial Engine

Interface Unit) performing a received address and endpoint de-

coding, MCI (Microcontroller Interface) handling the MCU

interface or performing address decoding and synchronization of

control signals, and the USB transceiver.

Microcontroller

Interface Unit

(MCI)

Serial Engine

Interface Unit

(SIU)

Generic

Function

Interface

(GFI)

FIFOs

Serial Interface

Engine (SIE)

USBD+

USBD-

CPU

Fig. 34 USB FCU (USB Function Control Unit) block

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