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uPD780065 Subseries PUM - Renesas Electronics

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86<br />

CHAPTER 4 PORT FUNCTIONS<br />

(2) Pull-up resistor option registers (PU0, PU2 to PU9)<br />

This register is used to set whether to use an internal pull-up resistor at each port or not. An on-chip pull-up<br />

resistor for each port pin can be specified by setting PU0, and PU2 to PU9.<br />

PU0 and PU2 to PU9 are set with a 1-bit or 8-bit memory manipulation instruction.<br />

RESET input sets this register to 00H.<br />

Caution When an on-chip pull-up resistor is used, even if output mode is set, the pull-up resistor will<br />

not be cut off.<br />

To use in output mode, set the corresponding pull-up resistor option registers to 0.<br />

Preliminary User’s Manual U13420EJ2V0UM00

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