System Integration Unit (SIU)
MPC5510 Microcontroller Family Reference Manual, Rev. 1
Freescale Semiconductor
6-23
Preliminary
6.3.2.13.1
Pad Configuration Registers 0–15 (SIU_PCR0–SIU_PCR15)
The SIU_PCR0 to SIU_PCR15 registers control the pin function and static electrical attributes of the Port
A pins PA0 to PA15 (input only). For each pin,
lists the signals available as the PA settings for
Function1, Function2 and Function3.
IBE
Input Buffer Enable. Enables the pad as an input and drives the input buffer enable signal.
0 Input buffer for the pad disabled.
1 Input buffer for the pad enabled.
bits 8–9
Reserved.
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 only when pins are configured as outputs.
0 Open drain disabled for the pad (push/pull driver enabled).
1 Open drain enabled for the pad.
HYS
Input Hysteresis. Controls whether hysteresis is enabled for the pad.
0 Hysteresis disabled for the pad.
1 Hysteresis enabled for the pad.
SRC
Slew Rate Control. Controls slew rate for the pad. Slew rate control pertains to pins with slow or medium I/O pad
types, and the output signals are driven according to the value of this field. Actual slew rate is dependent on the pad
type and load. See the MPC5510 Microcontroller Family Data Sheet for this information.
00 Minimum slew rate (slowest)
01 Medium slew rate
10 Reserved
11 Maximum slew rate (fastest)
WPE
Weak Pullup/Down Enable. Controls whether the weak pullup/down devices are enabled/disabled for the pad.
Pullup/down devices are enabled by default.
0 Weak pull device is disabled for the pad.
1 Weak pull device is enabled for the pad.
WPS
Weak Pullup/Down Select. Controls whether weak pullup or weak pulldown devices are used for the pad when weak
pullup/down devices are enabled. The WKPCFG pin determines whether pullup or pulldown devices are enabled at
reset. The WPS bit determines whether weak pullup or pulldown devices are used after reset, or for pads in which
the WKPCFG pin does not determine the reset weak pullup/down state.
0 Pulldown value enabled for the pad.
1 Pullup value enabled for the pad.
Offset:
S0x0040–S0x005F
Access: User read/write
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
0
0
0
0
PA
0
IBE
0
0
ODE
HYS
0
0
WPE
WPS
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
The IBE bit should be 0 when analog input function is selected.
Figure 6-14. Port A Pad Configuration Registers (SIU_PCR0 - SIU_PCR15)
Table 6-16. SIU_PCR Field Descriptions (continued)
Field
Description