MC9RS08KA8RM Datasheet, PDF (56/190 Pages) Freescale Semiconductor, Inc – MC9RS08KA8 Features

Chapter 6 Parallel Input/Output Control
R
W
Reset:
7
6
5
4
3
2
1
0
0
0
PTAPE5
PTAPE3
PTAPE2
PTAPE1
0
0
0
0
0
0
0
Figure 6-8. Internal Pulling Device Enable for Port A Register (PTAPE)
0
PTAPE0
0
Table 6-7. PTAPE Register Field Descriptions
Field
Description
5,3:0
PTAPE[5,3:0]
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 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
PTAPUD3 PTAPUD2 PTAPUD1 PTAPUD0
0
0
0
0
0
0
0
Figure 6-9. Pullup/Pulldown Device Control for Port A (PTAPUD)
Table 6-8. PTAPUD Register Field Descriptions
Field
Description
5,3:0
PTAPUD[5,3:0]
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 be transited to reduce
EMC emissions. Slew rate control has no effect on pins configured as inputs.
MC9RS08KA8 Series Reference Manual, Rev. 3
56
Freescale Semiconductor