Port Integration Module (S12PPIMV1)
2.3.10 Ports A, B, E, BKGD pin Pull-up Control Register (PUCR)
Address 0x000C
Access: User read/write(1)
7
6
5
4
3
2
1
0
R
W
0
0
0
0
BKPUE
PUPEE
PUPBE
PUPAE
Reset
0
1
0
1
0
0
0
0
= Unimplemented or Reserved
Figure 2-8. Ports ABEK, BKGD pin Pull-up Control Register (PUCR)
1. Read:Anytime in single-chip modes.
Write:Anytime, except BKPUE which is writable in Special Single-Chip Mode only.
Table 2-10. PUCR Register Field Descriptions
Field
Description
BKGD pin pull-up Enable—Enable pull-up device on pin
6
BKPUE This bit configures whether a pull-up device is activated, if the pin is used as input. If a pin is used as output this bit
has no effect.
1 Pull-up device enabled
0 Pull-up device disabled
4
Port E Pull-up Enable—Enable pull-up devices on all port input pins except pins 5 and 6
PUPEE This bit configures whether a pull-up device is activated on all associated port input pins. If a pin is used as output
this bit has no effect.
Pins 5 and 6 have pull-down devices enabled only during reset. This bit has no effect on these pins.
1 Pull-up device enabled
0 Pull-up device disabled
1
Port B Pull-up Enable—Enable pull-up devices on all port input pins
PUPBE This bit configures whether a pull-up device is activated on all associated port input pins. If a pin is used as output
this bit has no effect.
1 Pull-up device enabled
0 Pull-up device disabled
0
Port A Pull-up Enable—Enable pull-up devices on all port input pins
PUPAE This bit configures whether a pull-up device is activated on all associated port input pins. If a pin is used as output
this bit has no effect.
1 Pull-up device enabled
0 Pull-up device disabled
S12P-Family Reference Manual, Rev. 1.13
Freescale Semiconductor
67
FREESCALE [ Freescale ]
