Freescale Semiconductor MCF51QE128RM manual Port a Slew Rate Enable Register Ptase

Models: MCF51QE128RM

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Chapter 6 Parallel Input/Output Control

7

6

5

4

3

2

1

0

R

PTAPE7

PTAPE6

PTAPE5

PTAPE41

PTAPE3

PTAPE2

PTAPE1

PTAPE0

W

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reset:

0

0

0

0

0

0

0

0

 

 

 

 

 

 

 

 

 

1PTAPE4 has no effect on the output-only PTA4 pin.

Figure 6-6. Internal Pull Enable for Port A Register (PTAPE)

 

 

Table 6-3. PTAPE Register Field Descriptions

 

 

 

Field

 

Description

 

 

7–0

Internal Pull Enable for Port A Bits. Each of these control bits determines if the internal pull-up or pull-down device

PTAPEn

is enabled for the associated PTA pin. For port A 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 A bit n.

 

1

Internal pull-up/pull-down device enabled for port A bit n.

 

 

 

6.7.1.4Port A Slew Rate Enable Register (PTASE)

7

6

5

4

3

2

1

0

R

PTASE7

PTASE6

PTASE51

PTASE4

PTASE3

PTASE2

PTASE1

PTASE0

W

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reset:

0

0

0

0

0

0

0

0

 

 

 

 

 

 

 

 

 

1PTASE5 has no effect on the open drain PTA5 pin.

Figure 6-7. Slew Rate Enable for Port A Register (PTASE)

 

 

Table 6-4. PTASE Register Field Descriptions

 

 

 

Field

 

Description

 

 

7–0

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

PTASEn

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

 

0

Output slew rate control disabled for port A bit n.

 

1

Output slew rate control enabled for port A bit n.

 

 

 

6.7.1.5Port A Drive Strength Selection Register (PTADS)

7

6

5

4

3

2

1

0

R

PTADS7

PTADS6

PTADS51

PTADS4

PTADS3

PTADS2

PTADS1

PTADS0

W

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reset:

0

0

0

0

0

0

0

0

 

 

 

 

 

 

 

 

 

1PTADS5 has no effect on the open drain PTA5 pin.

Figure 6-8. Drive Strength Selection for Port A Register (PTADS)

MCF51QE128 MCU Series Reference Manual, Rev. 3

120

Freescale Semiconductor

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Freescale Semiconductor MCF51QE128RM manual Port a Slew Rate Enable Register Ptase