Renesas PROM Programming Adapter PCA7435FPG02 Especificações descarregar pdf (Página 23)

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Rev.3.00 Oct 23, 2006 page 23 of 53

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• Universal serial bus (USB) mode

By setting bits 7 and 6 of the serial I/O1 control register (address

001A16) to “11”, the USB mode is selected.

This mode conforms to Low-Speed USB2.0 specification. In this

mode serial I/O1 interrupt have 6 sources; USB in and out token

receive, setup token receive, USB reset, suspend, and resume. The

Fig. 26 USB transceiver block diagram

USB status/UART status register functions as the USB status register

(USBSTS).There is the USBVREFOUT pin for the USB reference

voltage output, and a D-line with 1.5 kΩ external resistor can be pull

up. USB mode block and USB transceiver block shown in figures

25 and 26.

Fig. 25 USB mode block diagram

XIN

Address 001816

Receive shift register

RxRDY

Receive buffer register

SYNC decoder

PID decoder

RxPID

OPID

PIDE

Address

comparative unit

USBA

End pointer

decoder

RxEP

CRC check

CRCE

Reset interrupt request

Suspend interrupt request

Resume interrupt request

Token interrupt request

EOP

NRZI,

bit stuffing decoder

BSTFE

Bus state

detection

Digital

PLL

6 MHz

USB

transceiver

NRZI,

bit stuffing encoder

Data bus

Address 001816

Transmit shift register

TxRDY

Transmit buffer register

EP0BYTE

EP1BYTE

SYNC, PID

generating unit

EP0PID

EP1PID

CRC encoder

EOP generating unit

USB transmit unit

P10/D-

1/D+

Differential input and

Single end input

Output data and

I/O control

1.5 MHz

Serial I/O1 control register

MOD0

MOD1

USB reference

power source voltage

USB control register

UVOE

(initial value “0”)

Output enable signal

Voltage input

Output amplifier USBV

REFOUT

D+/D-

output amplifier

Internal D- output signal

Internal D+ output signal

D-

D+

Suspend

(internal signal)

Signal for function stop

Output enable signal

Differential input

Single end input

Voltage input

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 55 56

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