TUSB6250 datasheet(71/124 Pages) TI

71 / 124 page

Miscellaneous and GPIO Configuration Registers

9−6

SLLS535A − January 2004

TUSB6250

9.6

PUPDFUNC: Pullup/Pulldown Configuration Register for Functional Pins (XDATA

at F08E)

The PUPDFUNC register allows the MCU to select/deselect and enable/disable the internal pullup or pulldown

resistor connection on certain functional pins.

765

43210

PDATPDD7

PDVBUS

PDATPDAT

PDDMARQ

POFFIORDY

PUSLIORDY

POFFINTRQ

PUSLINTRQ

R/W

BIT

NAME

RESET

FUNCTION

PUSLINTRQ

INTRQ pin pullup/pulldown resistor selection configuration by the MCU.

S If the MCU sets this bit to 1, the pullup resistor is selected and the pulldown resistor is

deselected.

S If the MCU clears this bit to 0, the pulldown resistor is selected and the pullup resistor is

deselected.

The power-up default is the pulldown resistor enabled and the pullup resistor disabled for the

INTRQ pin.

POFFINTRQ

INTRQ pin pullup/pulldown resistor power-down configuration by the MCU.

S If the MCU sets this bit to 1, both the pullup and pulldown resistors are disabled.

S If the MCU clears this bit to 0, either the pullup or the pulldown resistor is enabled for the

INTRQ pin, with the selection controlled by the PUSLINTRQ bit.

PUSLIORDY

IORDY pin pullup/pulldown resistor selection configuration by the MCU.

S If the MCU sets this bit to 1, the pullup resistor is selected and the pulldown resistor is

deselected.

S If the MCU clears this bit to 0, the pulldown resistor is selected and the pullup resistor is

deselected.

The power-up default is the pulldown enabled and the pullup disabled for the IORDY pin. The

MCU needs to enable the pullup on the IORDY pin during normal operation.

POFFIORDY

IORDY pin pullup/pulldown resistor power-down configuration by the MCU.

S If the MCU sets this bit to 1, both the pullup and pulldown resistors are disabled.

S If the MCU clears this bit to 0, either the pullup or the pulldown resistor is enabled for the

IORDY pin, with the selection controlled by the PUSLIORDY bit.

PDDMARQ

DMARQ pin pulldown resistor enable/disable configuration by the MCU.

S If the MCU sets this bit to 1, the pulldown resistor is disconnected from the pin.

S If the MCU clears this bit to 0, the pulldown resistor is connected to the pin.

PDATPDAT

ATAPI data bus (DD15−DD8, DD6−DD0) pin pulldown resistor enable/disable configuration by

the MCU. The DD7 pin has its own pulldown resistor control (PDATPDD7), as described in bit 7

of this register.

S If the MCU sets this bit to 1, the pulldown resistors are disconnected from the 16-bit data bus

(except DD7).

S If the MCU clears this bit to 0, the pulldown resistors are connected to the 16-bit data bus

(except DD7).

PDVBUS

VBUS pin pulldown resistor enable/disable configuration by the MCU. Before getting into

suspend, the firmware shall check the VBUS status and turns off the pulldown resistor if VBUS

is active.

S If the MCU sets this bit to 1, the pulldown resistor is disconnected from the pin.

S If the MCU clears this bit to 0, the pulldown resistor is connected to the pin.

PDATPDD7

ATAPI data bus DD7 pin pulldown resistor enable/disable configuration by the MCU. The

pulldown resistor control for the other ATA/ATAPI data bus pins is defined in bit 5 (PDATPDAT)

of this register.

S If the MCU sets this bit to 1, the pulldown resistor is disconnected from the DD7 pin.

S If the MCU clears this bit to 0, the pulldown resistor is connected to the DD7 pin.

The power-up default is the pulldown resistor enabled for the DD7 pin.

TUSB6250 датащи(PDF) 71 Page - Texas Instruments

TUSB6250 датащи(HTML) 71 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

датащи скачать

ссылки URL