mc9s12xd256 Freescale Semiconductor, Inc, mc9s12xd256 Datasheet - Page 926

• Manufacturer Part Number: mc9s12xd256
• Description: Hcs12x Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Chapter 23 DQ256 Port Integration Module (S12XDQ256PIMV2)
23.0.5.11 S12X_EBI Ports, BKGD, VREGEN Pin Pull-up Control Register (PUCR)
Read: Anytime in single-chip modes.
Write: Anytime, except BKPUE which is writable in special test mode only.
This register is used to enable pull-up devices for the associated ports A, B, C, D, E, and K. Pull-up devices
are assigned on a per-port basis and apply to any pin in the corresponding port currently configured as an
input.
926
PUPKE
BKPUE
PUPEE
PUPDE
PUPCE
PUPBE
PUPAE
Reset
Field
7
6
4
3
2
1
0
W
R
PUPKE
Figure 23-13. S12X_EBI Ports, BKGD, VREGEN Pin Pull-up Control Register (PUCR)
Pull-up Port K Enable
0 Port K pull-up devices are disabled.
1 Enable pull-up devices for Port K input pins.
BKGD and VREGEN Pin Pull-up Enable
0 BKGD and V
1 Enable pull-up devices on BKGD and V
Pull-up Port E Enable
0 Port E pull-up devices on bit 7, 4–0 are disabled.
1 Enable pull-up devices for Port E input pins bits 7, 4–0.
Note: Bits 5 and 6 of Port E have pull-down devices which are only enabled during reset. This bit has no effect
Pull-up Port D Enable
0 Port D pull-up devices are disabled.
1 Enable pull-up devices for all Port D input pins.
Pull-up Port C Enable
0 Port C pull-up devices are disabled.
1 Enable pull-up devices for all Port C input pins.
Pull-up Port B Enable
0 Port B pull-up devices are disabled.
1 Enable pull-up devices for all Port B input pins.
Pull-up Port A Enable
0 Port A pull-up devices are disabled.
1 Enable pull-up devices for all Port A input pins.
1
7
on these pins.
= Unimplemented or Reserved
BKPUE
REGEN
1
6
pull-up devices are disabled.
Table 23-14. PUCR Field Descriptions
MC9S12XDP512 Data Sheet, Rev. 2.17
0
0
5
PUPEE
REGEN
1
4
Description
pins.
PUPDE
0
3
PUPCE
0
2
PUPBE
Freescale Semiconductor
0
1
PUPAE
0
0