DOC7707 datasheet(194/307 Pages) ETC1

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194

7707F–AVR–11/10

AT90USB82/162

• 7-0 – DPADD7:0: DPRAM Address Low Bit

DAPDD7:0 is the least significant part of DPADD.

19.9.2

USB/PS2 Software Output Enable register – UPOE

• Bit 7:6 – UPOE[1:0]: USB/PS2 Output enable

Set these bits with the following configuration to enable or disable the USB/PS2 software drive.

UPOE1 - UPOE0

0 - 0 : Direct drive is disabled.

0 - 1 : Reserved

1 - 0 : Direct drive of DP/DM with USB levels (UPDRV[1:0] values)

1 - 1 : Direct drive of DP/DM with PS/2 levels (UPDRV[1:0] values)

• Bit 5:4 – UPDRV[1:0] : USB/PS2 direct drive values

Write in UPDRV1 the value to write on D+/SCK following the UPOE[1:0] configuration.

Write in UPDRV0 the value to write on D-/DATA following the UPOE[1:0] configuration.

• Bit 3 – SCKI : SCK Input value

This bit is set to one by hardware if a ‘1’ is read on SCK (PS/2 pad).

This bit is set to zero by hardware if a ‘0’ is read on SCK (PS/2 pad).

• Bit 2 – DATAI : DATA Input value

This bit is set to one by hardware if a ‘1’ is read on DATA (PS/2 pad).

This bit is set to zero by hardware if a ‘0’ is read on DATA (PS/2 pad).

• Bit 1 – DPI : D+ Input value

This bit is set to one by hardware if a ‘1’ is read on D+ (USB pad).

This bit is set to zero by hardware if a ‘0’ is read on D+ (USB pad).

• Bit 0 – DMI : D- Input value

This bit is set to one by hardware if a ‘1’ is read on D- (USB pad).

This bit is set to zero by hardware if a ‘0’ is read on D- (USB pad).

19.10 USB Software Operating modes

Depending on the USB operating mode, the software should perform some the following

operations:

Power On the USB interface

• Configure PLL interface

•Enable PLL

• Check PLL lock

Bit

3210

UPWE1

UPWE0

UPDRV1

UPDRV0

SCKI

DATAI

DPI

DMI

UPOE

Read/Write

R/W

RRRR

Initial Value

0000

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