PC87591L datasheet(120/437 Pages) NSC

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Embedded Controller Modules (Continued)

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Port Direction Registers (PxDIR and PwDIR)

These registers configure the direction of the Px and Pw pins.

●

When cleared (0), each bit in PxDIR or PwDIR deﬁnes the corresponding pin as input.

●

When set (1), each pin is deﬁned as output.

PxDIR and PwDIR are cleared (0) on reset except when otherwise noted in Appendix A. Clearing these registers configures

all the pins in port Px and Pw as input. Some specific reset values differ, as described in Appendix A on page 408.

Location: See Appendix A

Type: R/W

Port Data Output Register (PxDOUT, PzDOUT and PwDOUT)

Writing to PxDOUT, PzDOUT or PwDOUT registers sets the values of the output pins in ports Px, Pz and Pw, respectively.

Reading from one of these registers returns the last value written to the register.

Location: See Appendix A

Type: R/W

Port Data Input Registers (PxDIN, PyDIN and PwDIN)

Reading from PxDIN, PyDIN or PwDIN returns the current value of the pins in port Px, Py and Pw, respectively.

Location: See Appendix A

Type: RO

Bit

76543210

Name

Px Port Direction

Reset

00000000

Bit

76543210

Name

Pw Port Direction

Reset

00000000

Bit

76543210

Name

Px Port Output Data

Bit

76543210

Name

Pz Port Output Data

Bit

76543210

Name

Pw Port Output Data

Bit

76543210

Name

Px Port Input Data

Bit

76543210

Name

Py Port Input Data

Bit

76543210

Name

Pw Port Input Data

Reset

PC87591L Datasheet(PDF) 120 Page - National Semiconductor (TI)

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