UPD17015GS datasheet(88/120 Pages) NEC

88 / 120 page

µPD17015

Table 14-2 State of Each Pin and Cautions in Halt and Clock-Stop States

Pins are specified as general-purpose

input ports.

The output contents are held.

If externally pulled down while a high-

level signal is being output, or if

externally pulled up while a low-level

signal is being output, the current drain

increases.

Pin function

Pin symbol

State of each pin and processing precautions

Halt state

Clock-stop state

I/O port

Port 0A

P0A0

P0A1

Input port

Port 0B

P0B0

P0B1

P0B2

Output port

Port 0A

P0A2

P0A3

Port 0C

P0C0

P0C1

P0C2

P0C3

Port 0D

P0D0/BEEP

LCD segment

LCD0

The state existing prior to halt is held.

Low level output (display off)

LCD8

PLL frequency

VCOL

At PLL operation, the current drain

PLL disabled state.

synthesizer

VCOH

increases. In the PLL disabled state,

All pins enter the floating state.

all pins enter floating status.

When the level of the CE pin goes low,

the PLL is automatically disabled.

Crystal oscillation

XIN

The supply current changes with the

The XIN pin is pulled down inter-

circuit

XOUT

oscillation waveform of the crystal

nally and the XOUT pin outputs

oscillation circuit.

high level.

The larger the oscillation amplitude,

the lower the supply current.

Since the oscillation amplitude is

governed by the crystal and load

capacitor used, evaluation is

necessary.

Pins are specified as general-purpose

input ports.

Pins P0A0 and P0A1 must be externally

pulled down or pulled up to prevent the

current drain from increasing. Port 0B

(P0B0 to P0B2) is internally pulled

down.

The state before halt is held.

(1) When set as output pins

If externally pulled down while a

high-level signal is being output, or

if externally pulled up while a low-

level signal is being output, the

current drain increases.

(2) When set as input pins (other

than port 0B)

When floating, noise, etc. increase

the current drain.

(3) Port 0B (P0B0 to P0B2)

Since a pull-down resistor is built

in, externally pulling the pin up

causes the current drain to

increase.

UPD17015GS Datasheet(PDF) 88 Page - NEC

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