7641 datasheet(43/138 Pages) RENESAS

43 / 138 page

7641 Group

Rev.4.00

Aug 28, 2006

page 43 of 135

REJ03B0191-0400

USB FUNCTION

The 7641 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. This built-in USB

FCU performs the data transfer error detection and transfer retry

operation by hardware. The default 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 five endpoints (Endpoint 0 to Endpoint 4). The

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

to use. Each endpoint has IN (transmit) FIFO and OUT (receive)

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

set to “1”. There are two USB related interrupts supported for this

MCU: USB Function Interrupt and USB SOF Interrupt.

Figure 36 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. 36 USB FCU (USB Function Control Unit) block

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