38K2 datasheet(77/358 Pages) RENESAS

77 / 358 page

FUNCTIONAL DESCRIPTION

Rev.2.00

Oct 15, 2006

page 58 of 130

38K2 Group

REJ09B0338-0200

HARDWARE

HUB FUNCTION

The 38K2 Group has a HUB Function Control Circuit (HUBFCC)

that offers easy implementation of USB-hub functions (signal re-

peat and bus state detection). This circuit is in compliance with

USB Specification Version 2.0 Full-Speed/Low-Speed Transfer

Modes (12 Mbps/1.5 Mbps, equivalent to Version 1.1).

The HUBFCC operates with two external down-ports and one in-

ternal down-port, which is utilized by the USB addresses of the

built-in peripherals, enabling management of a total of three down-

ports independently.

A dedicated circuit automatically performs the bus state change

detection and error detection needed for the sequence manage-

ment of the hub repeater circuit, data repeat function, and

down-port status management. This dedicated control circuit en-

sures the user easy development of a program or timing design.

Fig. 87 HUB functions

CPU

Internal down-

port

External down-port

(USB device)

38K2 Group

USB

HUB

Up-port

(USB host)

External down-port

(USB device)

Each down-port register can be controlled by USB commands us-

ing USB addresses for HUB functions or detecting changes in the

bus state of down-ports. The HUBFCC is also equipped with a re-

mote wakeup signal transfer function for use during global resume

as other special signals management. The HUBFCC generates an

interrupt to the CPU when detecting a down-port state change (1

vector, 10 sources).

The flexibility of the indispensable yet wide-ranging HUBFCC

structure and an external interrupt function and I/O ports imple-

mented in the standard features of this MCU enable the power

supply management essential for USB-HUB functions and also al-

low users to easily and effortlessly configure their optimum

system.

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