UPD780138 datasheet(97/558 Pages) NEC

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UPD780138 Datasheet(PDF) 97 Page - NEC

Part #	UPD780138

Description	8-Bit Single-Chip Microcontrollers

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Manufacturer	NEC [NEC]

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UPD780138 Datasheet(HTML) 97 Page - NEC

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CHAPTER 4 PORT FUNCTIONS

User’s Manual U16228EJ2V0UD

4.2.2 Port 1

Port 1 is an 8-bit I/O port with an output latch. Port 1 can be set to the input mode or output mode in 1-bit units

using port mode register 1 (PM1). When the P10 to P17 pins are used as an input port, use of an on-chip pull-up

resistor can be specified in 1-bit units by pull-up resistor option register 1 (PU1).

This port can also be used for external interrupt request input, serial interface data I/O, clock I/O, and timer I/O.

RESET input sets port 1 to input mode.

Figures 4-6 to 4-10 show block diagrams of port 1.

Caution

When P10/SCK10/TxD0, P11/SI10/RxD0, and P12/SO10 are used as general-purpose ports, do not

write to serial clock selection register 10 (CSIC10).

Figure 4-6. Block Diagram of P10

P10/SCK10/TxD0

WRPU

WRPORT

WRPM

PU10

Alternate

function

Output latch

(P10)

PM10

Alternate

function

EVDD

P-ch

PU1

PM1

PU1:

Pull-up resistor option register 1

PM1:

Port mode register 1

RD:

Read signal

××: Write signal

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