CSM9S12XDT512SLK Freescale Semiconductor, CSM9S12XDT512SLK Datasheet - Page 942
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CSM9S12XDT512SLK
Manufacturer Part Number
CSM9S12XDT512SLK
Description
KIT STUDENT LEARNING 16BIT
Manufacturer
Freescale Semiconductor
Datasheet
1.MC9S12XD64CAA.pdf
(1348 pages)
Specifications of CSM9S12XDT512SLK
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Chapter 23 DQ256 Port Integration Module (S12XDQ256PIMV2)
23.0.5.40 Port P Data Direction Register (DDRP)
Read: Anytime.
Write: Anytime.
This register configures each port P pin as either input or output.
If the associated PWM channel or SPI module is enabled this register has no effect on the pins.
The PWM forces the I/O state to be an output for each port line associated with an enabled PWM7–0
channel. Channel 7 can force the pin to input if the shutdown feature is enabled. Refer to PWM section for
details.
If SPI is enabled, the SPI determines the pin direction. Refer to SPI section for details.
The DDRP bits revert to controlling the I/O direction of a pin when the associated peripherals are disabled.
23.0.5.41 Port P Reduced Drive Register (RDRP)
Read: Anytime.
Write: Anytime.
This register configures the drive strength of each port P output pin as either full or reduced. If the port is
used as input this bit is ignored.
944
DDRP[7:0]
Reset
Reset
Field
7–0
W
W
R
R
DDRP7
RDRP7
Data Direction Port P
0 Associated pin is configured as input.
1 Associated pin is configured as output.
Note: Due to internal synchronization circuits, it can take up to 2 bus clock cycles until the correct value is read
0
0
7
7
on PTP or PTIP registers, when changing the DDRP register.
DDRP6
RDRP6
0
0
6
6
Figure 23-43. Port P Reduced Drive Register (RDRP)
Figure 23-42. Port P Data Direction Register (DDRP)
Table 23-39. DDRP Field Descriptions
DDRP5
RDRP5
MC9S12XDP512 Data Sheet, Rev. 2.21
0
0
5
5
DDRP4
RDRP4
0
0
4
4
Description
DDRP3
RDRP3
0
0
3
3
DDRP2
RDRP2
0
0
2
2
DDRP1
RDRP1
Freescale Semiconductor
0
0
1
1
DDRP0
RDRP0
0
0
0
0
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