M68HC08 datasheet(174/288 Pages) FREESCALE

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Universal Serial Bus Module (USB)

Data Sheet

MC68HC908BD48 — Rev. 2.1

174

Universal Serial Bus Module (USB)

Freescale Semiconductor

13.5.6 USB Control Register 2 (UCR2)

RSTIFR — Reset Interrupt Flag Clear

Writing a logic "1" to this bit clears the RSTIFR flag. Writing a "0" has

no effect. Reset clears this bit.

1 = Writing 1 clears RSTIFR

0 = No effect

TX1STR — TX1ST Clear

Writing a logic "1" to this bit clears the TX1STR flag. Writing a "0" has

no effect. Reset clears this bit.

1 = Writing 1 clears TX1STR

0 = No effect

PULLEN — Pullup Enable on D–

This bit is set to enable the internal 1.5k

Ω pullup resister connected

between the USB D– line and 3.3V. Reset clears this bit.

1 = Enable 1.5k

Ω pullup resistor between D– and 3.3V

0 = Disable 1.5k

Ω pullup resistor between D– and 3.3V

SUSPND — USB Suspend

If the 3ms constant idle state is detected on the USB bus, user

software should set this bit to allow the USB module to enter suspend

mode. In the suspend mode, the clock to USB module will be stopped,

and other unnecessary analog circuitry will be powered down. When

a resume is detected (RESUMF = 1), user software must clear

SUSPND in the interrupt service routine.

1 = Enable USB suspend mode

0 = Disable USB suspend mode

Address:

$002D

Bit 7

654321

Bit 0

Read:

PULLEN SUSPND ENABLE2 ENABLE1 STALL2

STALL1

Write: RSTIFR

TX1STR

Reset:

00000000

Figure 13-6. USB Control Register 2 (UCR2)

M68HC08 Datasheet(PDF) 174 Page - Freescale Semiconductor, Inc

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