System Integration Unit (SIU)
MPC5510 Microcontroller Family Reference Manual, Rev. 1
Freescale Semiconductor
6-21
Preliminary
6.3.2.13
Pad Configuration Registers (SIU_PCR)
The following subsections define the SIU_PCRs for all device pins that allow configuration of the pin
function, direction, and static electrical attributes. The information presented pertains to which bits and
fields are active for a given pin or group of pins, and the register reset state. The reset state of SIU_PCRs
in the following sections is prior to executing the boot-assist module (BAM) program. The BAM program
may change SIU_PCRs based on reset configuration. See the BAM section of the manual for more detail.
For all PCRs:
•
If the pin is configured as an input only, the ODE and SRC bits do not apply.
•
If the pin is configured as an output only, the HYS bit does not apply.
•
When a pin is configured as an output, the weak internal pull up/down is disabled, regardless of the
WPE or WPS settings in the PCR.
IBE and OBE bit definitions are specific to each PCR. When an I/O function is input- or output-only, the
IBE and OBE bits do not have to be set to enable the input or output. When an I/O function can be either
an input and output, the IBE and OBE bits must be set accordingly (IBE = 1 for input, and OBE = 1 for
output). For I/O functions that change direction dynamically, such as the external data bus, switching
between input and output is handled internally, and the IBE and OBE bits have no effect.
Offset:
SI 0x0034
Access: User read only
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R FNMI
0
FNMI
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
R
FI15
FI14
FI13
FI12
IFI11
FI10
FI9
FI8
FI7
FI6
FI5
FI4
FI3
FI2
FI1
FI0
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Figure 6-13. External IRQ Filtered Input Register (SIU_IFIR)
Table 6-15. SIU_IFIR Field Descriptions
Field
Function
FNMI0
Filtered Non Maskable Interrupt 0. This bit is set/cleared for the corresponding NMI pin:
0 A logic one has passed through the NMI digital filter for NMI0 pin.
1 A logic zero has passed through the NMI digital filter for NMI0 pin.
FNMI1
Filtered Non Maskable Interrupt 1. This bit is set/cleared for the corresponding NMI pin:
0 A logic one has passed through the NMI digital filter for NMI1 pin.
1 A logic zero has passed through the NMI digital filter for NMI1 pin.
bits 2–15 Reserved.
FIn
Filtered Input n. This bit is set/cleared for the corresponding filtered IRQ pin:
0 A logic one has passed through the IRQ digital filter for the corresponding IRQ pin.
1 A logic zero has passed through the IRQ digital filter for the corresponding IRQ pin.