System Integration Unit (SIU)
MPC5565 Microcontroller Reference Manual, Rev. 1.0
Freescale Semiconductor
6-25
6.3.1.13
Pad Configuration Register 0 (SIU_PCR0)
The SIU_PCR0 register controls the function, direction, and electrical attributes of
CS[0]_ADDR[8]_GPIO[0].
Figure 6-14. CS[0]_ADDR[8]_GPIO[0] Pad Configuration Register (SIU_PCR0)
11
HYS
Input hysteresis. Controls whether hysteresis is enabled for the pad.
0
Disable hysteresis for the pad.
1
Enable hysteresis for the pad.
12–13
SRC[
0:1
]
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
depends on the pad type and load. Refer to the electrical specifications for this information.
00
Minimum slew rate
01
Medium slew rate
10
Invalid value
11
Maximum slew rate
14
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
Disable weak pull device for the pad.
1
Enable weak pull device for the pad.
15
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 during 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 is enabled for the pad.
1
Pullup is enabled for the pad.
Address: Base + 0x0040
Access: R/W
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
0
0
0
0
PA
1
1
Do not configure the PA fields in SIU_PCR[0]
and
SIU_PCR[4] to ADDR[8]. Configure only one pin to ADDR[8].
OBE
2
2
When configured as CS[0] or ADDR[8], the OBE bit has no effect. When configured as GPDO, set the OBE bit to 1.
IBE
3
3
When configured as CS[0], ADDR[8], or GPDO, set the IBE bit to 1 to show the state in the GPDI register.
Clearing the IBE bit to 0 reduces power consumption. When configured as GPDI, set the IBE bit to 1.
DSC
ODE
4
4
When configured as CS[0] or ADDR[8], clear the ODE bit to 0.
HYS
0
0
WPE
5
5
Refer to the EBI section for weak pullup settings when configured as CS[0] or ADDR[8].
WPS
W
RESET:
0
0
0
0
0
0
0
0
1
1
0
0
0
0
1
1
Table 6-19. SIU_PCR Field Descriptions (continued)
Field
Description
Содержание MPC5565
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