pc87591l National Semiconductor Corporation, pc87591l Datasheet - Page 121

• Manufacturer Part Number: pc87591l
• Description: Lpc Mobile Embedded Controllers
• Manufacturer: National Semiconductor Corporation

Revision 1.07
Embedded Controller Modules
Port Weak Pull-Up Registers (PxWPU, PyWPU)
These registers control the pull-up for the related pin, when it used either as GPIO or in its alternate function. The pull-up is
enabled when the corresponding bit of PxWPU or PyWPU is set and the port buffer is in TRI-STATE. Otherwise, the pull-up
is disabled (i.e., high impedance).
On reset, PxWPU or PyWPU is cleared (0), disabling all pull-ups.
Location: See Appendix A
Type: R/W
Bit
Name
Reset
Bit
Name
Reset
7
0
7
0
6
0
6
0
(Continued)
5
0
5
0
Px Port Weak Pull-Up Enable
Py Port Weak Pull-Up Enable
121
4
0
4
0
3
0
3
0
2
0
0
2
1
0
1
0
www.national.com
0
0
0
0