UPD780204 datasheet(92/418 Pages) NEC

Part #	UPD780204

Description	8-Bit Single-Chip Microcontrollers

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Manufacturer	NEC [NEC]

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CHAPTER 4

PORT FUNCTIONS

92

User’s Manual U11302EJ4V0UM

4.2.8

Port 10

Port 10 is an 8-bit I/O port with an output latch. The P100 to P107 pins can be set to input mode/output mode

in 1-bit units using port mode register 10 (PM10). In mask ROM versions, use of pull-down resistors can be specified

in 1-bit units with the mask option. Pull-down resistor connection to VLOAD or VSS can be specified in 4-bit units.

The

µPD78P0208 does not contain pull-down resistors.

Port 10 can drive LEDs directly.

Alternate functions include VFD controller/driver display output.

RESET input sets port 10 to input mode.

Figure 4-11 shows a block diagram of port 10.

Caution Adjust the number of pull-down resistors so that the total power dissipation (refer to 15.10

Calculating Total Power Dissipation) is not exceeded.

Figure 4-11. Block Diagram of P100 to P107

RD

WRPORT

WRPM

Selector

Output latch

(P100 to P107)

PM100 to PM107

Alternate function

P100/FIP29

to

P107/FIP36

VLOAD

Mask option

Only mask ROM versions.

The PD78P0208 has no

pull-down resistors.

µ

PM:

RD:

WR:

Port mode register

Port 10 read signal

Port 10 write signal

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UPD780204 Datasheet(PDF) 92 Page - NEC

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