Atmel AT85DVK-07 Dokumentacja Pobierz pdf (Strona 10)

AT85C51SND3Bx

7632A–MP3–03/06

USB Controller Table 7. USB Controller Signal Description

NFCLE O

Command Latch Enable Signal

Asserted high during command write cycle.

NFRE O

Read Enable Signal

Read signal asserted low during NF/SMC read operation.

NFWE O

Write Enable Signal

Write signal asserted low during NF/SMC write operation.

NFCE0 O

Nand Flash 0 Chip Enable

NFCE0 is active low and is asserted by the nand flash controller each

time it makes access to the device 0.

NFCE1

SMLCK

Nand Flash 1 Chip Enable

NFCE1 is active low and is asserted by the nand flash controller each

time it makes access to the selected device.

SmartMediaCard/xD-Picture Card Write Lock Signal

SMLCK is the card write protected input. A low level on this pin

indicates the card is write protected.

Note: When used as SMLCK input, pad has internal pull-up.

P4.4

NFCE2

SMINS

Nand Flash 2 Chip Enable

NFCE2 is active low and is asserted by the nand flash controller each

time it makes access to the selected device.

SmartMediaCard/xD-Picture Card Insertion Signal

SMINS is the card presence signal. A low level on this input indicates

the card is present in its slot.

Note: When used as SMINS input, pad has internal pull-up.

P4.5

NFCE3

SMCE

Nand Flash 3 Chip Enable

NFCE3 is active low and is asserted by the nand flash controller each

time it makes access to the selected device.

SmartMediaCard/xD-Picture Card Chip Enable

SMCE is active low and is asserted by the nand flash controller each

time it makes access to the card.

P4.6

NFWP O

Write Protect Signal

NFWP is the Nand Flash / SmartMediaCard/xD-Picture Card write

protect signal. This signal is active low and is set to low during reset in

order to protect the memory against parasitic writes.

Signal

Name Type Description

Alternate

Function

Signal

Name

Type Description

Alternate

Function

DPF I/O USB Full Speed Positive Data Upstream Port -

DMF I/O USB Full Speed Minus Data Upstream Port -

DPH I/O USB High Speed Plus Data Upstream Port -

DMH I/O USB High Speed Minus Data Upstream Port -

UVCON O

USB VBUS Control line

UVCON is used to control the external VBUS power supply ON or OFF.

Note: This output is requested for OTG mode.

P3.6

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 262 263

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