System Interface Unit (SIU)
MPC5553/MPC5554 Microcontroller Reference Manual,
Rev. 5
Freescale Semiconductor
6-21
Table 6-16. SIU_PCR Field Descriptions
Register Bit Range
Field Name [Bits]
Description
0–2
Reserved.
3–5
PA[0:2]
Pin assignment. Selects the function of a multiplexed pad. A separate port enable output
signal from the SIU is asserted for each value of this register. The size of the field can be
from 1 to 3 bits, depending on the amount of multiplexing on the pad.
6
OBE
Output buffer enable. Enables the pad as an output and drives the output buffer enable
signal.
0 Output buffer for the pad is disabled.
1 Output buffer for the pad is enabled.
7
IBE
Input buffer enable. Enables the pad as an input and drives the input buffer enable signal.
0 Input buffer for the pad is disabled.
1 Input buffer for the pad is enabled.
8–9
DSC[0:1]
Drive strength control. Controls the pad drive strength to pins with the fast I/O pad type (F).
00 10 pF drive strength
01 20 pF drive strength
10 30 pF drive strength
11 50 pF drive strength
10
ODE
Open drain output enable. Controls output driver configuration for the pads. Either open
drain or push/pull driver configurations can be selected. This feature applies to output pins
only.
0 Open drain is disabled for the pad (push/pull driver enabled).
1 Open drain is enabled for the pad.
11
HYS
Input hysteresis. Controls whether hysteresis is enabled for the pad.
0 Hysteresis is disabled for the pad.
1 Hysteresis is enabled for the pad.
Pin Assignment Bit Field
Pin Function
1
1
For all SIU_PCRs that do not comply with these rules, the PA definition is
given explicitly with the SIU_PCR definition.
1-bit
2
(2 Functions)
2
For future software compatibility, it is recommended that all PA fields be
treated as 3-bit fields, with the unused bits written as 0.
(3 Functions)
3-bit
(4 Functions)
0
0
0
0
0
0
0
0
0
GPIO
0
0
1
0
0
1
0
0
1
Primary Function
0
1
0
0
1
0
Alternate Function 1
0
1
1
0
1
1
Main Primary Function
1
0
0
Alternate Function 2
1
0
1
Reserved
1
1
0
Reserved
1
1
1
Reserved
Summary of Contents for MPC5553
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