Freescale Semiconductor MCF51QE128RM manual Port J Pull Enable Register Ptjpe

Models: MCF51QE128RM

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Chapter 6 Parallel Input/Output Control

6.7.9.3Port J Pull Enable Register (PTJPE)

The port J pull enable register enables pull-ups on the corresponding PTJ pin. In some cases, a pull-down device is enabled if pull-downs are supported by an alternate pin function (e.g., KBI).

R

W

Reset:

7

6

5

4

3

2

1

0

PTJPE7

PTJPE6

PTJPE5

PTJPE4

PTJPE3

PTJPE2

PTJPE1

PTJPE0

 

 

 

 

 

 

 

 

0

0

0

0

0

0

0

0

 

 

 

 

 

 

 

 

 

 

Figure 6-52. Internal Pull Enable for Port J Register (PTJPE)

 

 

Table 6-49. PTJPE Register Field Descriptions

 

 

 

Field

 

Description

 

 

7–0

Internal Pull Enable for Port J Bits. Each of these control bits determines if the internal pull-up device is enabled

PTJPEn

for the associated PTJ pin. For port J pins configured as outputs, these bits have no effect and the internal pull

 

devices are disabled.

 

0

Internal pull-up device disabled for port J bit n.

 

1

Internal pull-up device enabled for port J bit n.

 

 

 

6.7.9.4Port J Slew Rate Enable Register (PTJSE)

R

W

Reset:

7

6

5

4

3

2

1

0

PTJSE7

PTJSE6

PTJSE5

PTJSE4

PTJSE3

PTJSE2

PTJSE1

PTJSE0

 

 

 

 

 

 

 

 

0

0

0

0

0

0

0

0

 

 

Figure 6-53. Slew Rate Enable for Port J Register (PTJSE)

 

 

Table 6-50. PTJSE Register Field Descriptions

 

 

 

Field

 

Description

 

 

7–0

Output Slew Rate Enable for Port J Bits. Each of these control bits determines if the output slew rate control is

PTJSEn

enabled for the associated PTJ pin. For port J pins configured as inputs, these bits have no effect.

 

0

Output slew rate control disabled for port J bit n.

 

1

Output slew rate control enabled for port J bit n.

 

 

 

6.7.9.5Port J Drive Strength Selection Register (PTJDS)

R

W Reset:

7

6

5

4

3

2

1

0

PTJDS7

PTJDS6

PTJDS5

PTJDS4

PTJDS3

PTJDS2

PTJDS1

PTJDS0

 

 

 

 

 

 

 

 

0

0

0

0

0

0

0

0

 

 

 

 

 

 

 

 

Figure 6-54. Drive Strength Selection for Port J Register (PTJDS)

MCF51QE128 MCU Series Reference Manual, Rev. 3

Freescale Semiconductor

139

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Freescale Semiconductor MCF51QE128RM manual Port J Pull Enable Register Ptjpe, Port J Slew Rate Enable Register Ptjse