MC68HC908JW32_09 Datasheet, PDF (183/232 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

Port Options
DPPULLEN — D+ Pullup Enable
This read/write bit enables the USB D+ pullup option to VREF33 for pin PTE2.
1 = Configure PTE2 to have internal USB pullups to VREF33
0 = Disconnect PTE2 internal pullups
PTE3P — Pin PTE3 Pullup Enable
This read/write bit enables the pullup option for pin PTE3 if it is not configured as an USB D– pin or
USB module is disabled.
1 = Configure PTE3 to have 5k internal pullups
0 = Disconnect PTE3 internal pullups
PTE2P — Pin PTE2 Pullup Enable
This read/write bit enables the pullup option for pin PTE2 if it is not configured as an USB D+ pin or
USB module is disabled.
1 = Configure PTE2 to have 5k internal pullups
0 = Disconnect PTE2 internal pullups
NOTE
When the USB module is enabled, the pullup controlled by PTE2P and
PTE3P are disconnected; PTE2/D+ pin functions as D+ which has a
programmable pull-up resistor by setting the DPPULLEN bit.
13.7.3 Pullup Control Register (PULLCR)
The pullup control register enables the embedded pullup resistor associated with port B [7:0].
Address: $003E
Bit 7
6
5
4
3
2
1
Bit 0
Read:
PULL7EN
Write:
Reset: 0
PULL6EN
0
PULL5EN
0
PULL4EN
0
PULL3EN
0
PULL2EN
0
PULL1EN
0
PULL0EN
0
Figure 13-17. Pullup Control Register (PULLCR)
PULL[7:0]EN — Pullup Enable Bit
These read/write bits enables the embedded pullup resistor associated with the corresponding port
pin. Reset clears this bit.
1 = Pullup resistor is enabled
0 = Pullup resistor is disabled
MC68HC908JW32 Data Sheet, Rev. 6
Freescale Semiconductor
183