MC68HC908BD48 Datasheet, PDF (174/290 Pages) Freescale Semiconductor, Inc – Microcontrollers

Universal Serial Bus Module (USB)
13.5.6 USB Control Register 2 (UCR2)
Address: $002D
Bit 7
6
5
4
3
2
1
Read: 0
0
PULLEN SUSPND ENABLE2 ENABLE1 STALL2
Write: RSTIFR TX1STR
Reset: 0
0
0
0
0
0
0
Figure 13-6. USB Control Register 2 (UCR2)
Bit 0
STALL1
0
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 1.5kΩ pullup resister connected
between the USB D– line and 3.3V. Reset clears this bit.
1 = Enable 1.5kΩ pullup resistor between D– and 3.3V
0 = Disable 1.5kΩ 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
Technical Data
174
Universal Serial Bus Module (USB)
MC68HC908BD48 — Rev. 1.0
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