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MCF51QE128 MCU Series Reference Manual, Rev. 3
Freescale Semiconductor 137
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Chapter 6 Parallel Input/Output Control
6.7.8.3 Port H Pull Enable Register (PTHPE)
The port H pull enable register enables pull-ups on the corresponding PTH pin. In some cases, a pull-down
device is enabled if pull-downs are supported by an alternate pin function (e.g., KBI).
6.7.8.4 Port H Slew Rate Enable Register (PTHSE)
6.7.8.5 Port H Drive Strength Selection Register (PTHDS)
76543210
R
PTHPE7 PTHPE6 PTHPE5 PTHPE4 PTHPE3 PTHPE2 PTHPE1 PTHPE0
W
Reset:00000000
Figure 6-47. Internal Pull Enable for Port H Register (PTHPE)
Table 6-44. PTHPE Register Field Descriptions
Field Description
7–0
PTHPEn
Internal Pull Enable for Port H Bits. Each of these control bits determines if the internal pull-up device is enabled
for the associated PTH pin. For port H pins configured as outputs, these bits have no effect and the internal pull
devices are disabled.
0 Internal pull-up device disabled for port H bit n.
1 Internal pull-up device enabled for port H bit n.
76543210
R
PTHSE7 PTHSE6 PTHSE5 PTHSE4 PTHSE3 PTHSE2 PTHSE1 PTHSE0
W
Reset:00000000
Figure 6-48. Slew Rate Enable for Port H Register (PTHSE)
Table 6-45. PTHSE Register Field Descriptions
Field Description
7–0
PTHSEn
Output Slew Rate Enable for Port H Bits. Each of these control bits determines if the output slew rate control is
enabled for the associated PTH pin. For port H pins configured as inputs, these bits have no effect.
0 Output slew rate control disabled for port H bit n.
1 Output slew rate control enabled for port H bit n.
76543210
R
PTHDS7 PTHDS6 PTHDS5 PTHDS4 PTHDS3 PTHDS2 PTHDS1 PTHDS0
W
Reset:00000000
Figure 6-49. Drive Strength Selection for Port H Register (PTHDS)