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MC9RS08KA2 Datasheet, PDF (48/132 Pages) Freescale Semiconductor, Inc – Microcontrollers
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Chapter 6 Parallel Input/Output Control
corresponding pulling device enable register bit. The pulling device is also disabled if the pin is controlled
by an analog function.
R
W
Reset:
7
6
5
4
3
2
1
0
0
0
PTAPE5
PTAPE4
PTAPE2
PTAPE1
0
0
0
0
0
0
0
Figure 6-4. Internal Pulling Device Enable for Port A Register (PTAPE)
Table 6-3. PTAPE Register Field Descriptions
0
PTAPE0
0
Field
Description
5:4,2:0
PTAPE[5:4,2:0]
Internal Pulling Device Enable for Port A Bits — Each of these control bits determines whether the internal
pulling device is enabled for the associated PTA pin. For port A pins that are configured as outputs, these bits
have no effect and the internal pullup devices are disabled.
0 Internal pulling device disabled for port A bit n.
1 Internal pulling device enabled for port A bit n.
6.3.1.2 Pullup/Pulldown Control
Pullup/pulldown control is used to select the pullup or pulldown device enabled by the corresponding
PTAPE bit.
7
R
0
W
Reset:
0
6
5
4
3
2
1
0
0
0
PTAPUD5 PTAPUD4
PTAPUD2 PTAPUD1 PTAPUD0
0
0
0
0
0
0
0
Figure 6-5. Pullup/Pulldown Device Control for Port A (PTAPUD)
Table 6-4. PTAPUD Register Field Descriptions
Field
Description
5:4,2:0
PTAPUD[5:4,2:0]
Pullup/Pulldown Device Control for Port A Bits — Each of these control bits determines whether the
internal pullup or pulldown device is selected for the associated PTA pin. The actual pullup/pulldown device
is only enabled by enabling the associated PTAPE bit.
0 Internal pullup device is selected for port A bit n.
1 Internal pulldown device is selected for port A bit n.
6.3.1.3 Output Slew Rate Control Enable
Slew rate control can be enabled for each port pin by setting the corresponding bit in the slew rate control
register (PTASEn). When enabled, slew control limits the rate at which an output can transition in order to
reduce EMC emissions. Slew rate control has no effect on pins that are configured as inputs.
MC9RS08KA2 Series Data Sheet, Rev. 2
48
Freescale Semiconductor
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