Filter
Top Products
MCF51QE128 MCU Series Reference Manual, Rev. 3
122 Freescale Semiconductor
Get the latest version from freescale.com
Chapter 6 Parallel Input/Output Control
6.7.2.3 Port B Pull Enable Register (PTBPE)
The port B pull enable register enables pull-ups on the corresponding PTB pin. In some cases, a pull-down
device is enabled if pull-downs are supported by an alternate pin function (e.g., KBI).
6.7.2.4 Port B Slew Rate Enable Register (PTBSE)
Table 6-7. PTBDD Register Field Descriptions
Field Description
7–0
PTBDDn
Data Direction for Port B Bits. These read/write bits control the direction of port B pins and what is read for PTBD
reads.
0 Input (output driver disabled) and reads return the pin value.
1 Output driver enabled for port B bit n and PTBD reads return the contents of PTBDn.
76543210
R
PTBPE7 PTBPE6 PTBPE5 PTBPE4 PTBPE3 PTBPE2 PTBPE1 PTBPE0
W
Reset:00000000
Figure 6-11. Internal Pull Enable for Port B Register (PTBPE)
Table 6-8. PTBPE Register Field Descriptions
Field Description
7–0
PTBPEn
Internal Pull Enable for Port B Bits. Each of these control bits determines if the internal pull-up or pull-down device
is enabled for the associated PTB pin. For port B pins configured as outputs, these bits have no effect and the
internal pull devices are disabled.
0 Internal pull-up/pull-down device disabled for port B bit n.
1 Internal pull-up/pull-down device enabled for port B bit n.
76543210
R
PTBSE7 PTBSE6 PTBSE5 PTBSE4 PTBSE3 PTBSE2 PTBSE1 PTBSE0
W
Reset:00000000
Figure 6-12. Slew Rate Enable for Port B Register (PTBSE)
Table 6-9. PTBSE Register Field Descriptions
Field Description
7–0
PTBSEn
Output Slew Rate Enable for Port B Bits. Each of these control bits determines if the output slew rate control is
enabled for the associated PTB pin. For port B pins configured as inputs, these bits have no effect.
0 Output slew rate control disabled for port B bit n.
1 Output slew rate control enabled for port B bit n.