Chapter 6 Parallel Input/Output Control

6.7.3.7Port C Slew Rate Enable Register (PTCSE)

R

W

Reset:

7

6

5

4

3

2

1

0

PTCSE7

PTCSE6

PTCSE5

PTCSE4

PTCSE3

PTCSE2

PTCSE1

PTCSE0

 

 

 

 

 

 

 

 

0

0

0

0

0

0

0

0

 

 

 

 

 

 

 

 

 

 

Figure 6-20. Slew Rate Enable for Port C Register (PTCSE)

 

 

Table 6-17. PTCSE Register Field Descriptions

 

 

 

Field

 

Description

 

 

7–0

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

PTCSEn

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

 

0

Output slew rate control disabled for port C bit n.

 

1

Output slew rate control enabled for port C bit n.

 

 

 

6.7.3.8Port C Drive Strength Selection Register (PTCDS)

R

W

Reset:

7

6

5

4

3

2

1

0

PTCDS7

PTCDS6

PTCDS5

PTCDS4

PTCDS3

PTCDS2

PTCDS1

PTCDS0

 

 

 

 

 

 

 

 

0

0

0

0

0

0

0

0

 

 

 

 

 

 

 

 

 

 

Figure 6-21. Drive Strength Selection for Port C Register (PTCDS)

 

 

Table 6-18. PTCDS Register Field Descriptions

 

 

 

Field

 

Description

 

 

7–0

Output Drive Strength Selection for Port C Bits. Each of these control bits selects between low and high output

PTCDSn

drive for the associated PTC pin. For port C pins configured as inputs, these bits have no effect.

 

0

Low output drive strength selected for port C bit n.

 

1

High output drive strength selected for port C bit n.

 

 

 

6.7.4Port D Registers

Port D is controlled by the registers listed below.

6.7.4.1Port D Data Register (PTDD)

R

W Reset:

7

6

5

4

3

2

1

0

PTDD7

PTDD6

PTDD5

PTDD4

PTDD3

PTDD2

PTDD1

PTDD0

 

 

 

 

 

 

 

 

0

0

0

0

0

0

0

0

 

 

 

 

 

 

 

 

Figure 6-22. Port D Data Register (PTDD)

MCF51QE128 MCU Series Reference Manual, Rev. 3

126

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Freescale Semiconductor MCF51QE128RM Port D Registers, Port C Slew Rate Enable Register Ptcse, Port D Data Register Ptdd