NJU3101 データシートの表示（PDF） - Japan Radio Corporation

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NJU3101

4-BIT SINGLE CHIP TINY CONTROLLER

Japan Radio Corporation  

NJU3101

s AC CHARACTERISTICS TIMING CHART

EXTERNAL CLOCK

OSC1

tCPH

1/fOSC

tCPF tCPL

VIH3

VIL3

tCPR

EDGE DETECTOR INPUT

PD1

tEDR

VIH1

VIL1

tEDF

RESET INPUT

RESET

tRST

tRSR

VIH2

VIL2

RESTART SIGNAL INPUT

PD0

tSTR

VIH1

VIL1

PORT INPUT

PORT

tPIN

VIH1, VIH2

VIL1, VIL2

s MASK OPTION

The NJU3101 can set or select the following options by the mask option as same as the mask of the

program coding in ROM.

(1) INPUT OUTPUT Terminal Selection

All of input-output terminals select a terminal type from the following table for each group as a PORT by the

mask option.

INPUT TYPE

SYMBOL

OUTPUT TYPE

SYMBOL

PA0 − PA3 C-MOS input with Pull-up

IA C-MOS output

OB

PD0, PD1 C-MOS input

IC

C-MOS input with Pull-up

PB0, PC0

C-MOS input

IA N-channel OPEN DRAIN OA

output with Pull-up

IC N-channel OPEN DRAIN OC

output

C-MOS SCHMITT TRIGGER IB

input with Pull-up

PE0, PE1 C-MOS SCHMITT TRIGGER ID C-MOS output

OB

input

(2) Edge Detector Selection

When the PORTD(PHY4) is set as the input, PD1 terminal operates as Edge Detector terminal. The result

of edge detection is set into bit2(b2) of PORTD(PHY4). The polarity of the edge, rising as "low to high" or

falling as "high to low", is selected by the mask option.

Rising edge

Falling edge

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