EM6821WS21 datasheet(58/68 Pages) EMMICRO

58 / 68 page

EM6821

www.emmicroelectronic.com

18.1.4 Port SP Metal Options

Pull-up or no pull-up can be selected

for each port SP input. The pull-up is

only active in Nch. open drain mode.

Pull-down or no pull-down can be

selected for each port SP input.

The total pull value (pull-up or pull-

down) is a series resistance out of the

resistance

and

the

switching

transistor. As a switching transistor the

user can choose between a high

impedance (weak) or a low impedance

(strong) switch. Weak , strong or none

must be chosen. The default is strong.

The default resistor R1 value is 90

KOhm.

The

user

may

choose

different value lower than 90kOhm.

However

the

value

must

first

checked

and

agreed

Microelectronic Marin SA. Refer also to

chapter 19.2 and 19.1 for the pull

values.

To select an option put an X in

column 1,2 and 4 and reconfirm

the R1 value in column 3.

The default value is : strong pull-

down with R1=90 KOhm

To select an option put an X in

column 1,2 and 4 and reconfirm

the R1 value in column 3.

The default value is : strong pull-up

with R1=90 KOhm

Figure 40. Port SP Pull Options

Resistor R1

MPSPDweak[n]

Weak Pull-down

MPSPDstrong[n]

Strong Pull-down

MPSPUweak[n]

Weak Pull-up

MPSPUstrong[n]

Strong Pull-up

Pull-up Control

PSP[n]

Terminal

100 KOhm

Pull-down

Block

No Pull-up

No Pull-down

Input Circuitry

Option

Name

Strong

Pull-

down

Weak

Pull-

down

Value

Typ.90k

Pull-

Down

MPSPD[3]

PS3 input pull-down

MPSPD[2]

PS2 input pull-down

MPSPD[1]

PS1 input pull-down

MPSPD[0]

PS0 input pull-down

Option

Name

Strong

Pull-up

weak

Pull-up

Value

Typ. 90k

Pull-up

MPSPU[3]

PS3 input pull-up

MPSPU[2]

PS2 input pull-up

MPSPU[1]

PS1 input pull-up

MPSPU[0]

PS0 input pull-up

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