EM6517 datasheet(48/64 Pages) EMMICRO

48 / 64 page

EM6517

03/02 REV. C/448

 2002, EM Microelectronic-Marin SA

www.emmicroelectronic.com

19 Mask Options

Most options which in many µControllers are realized as metal mask options are directly user selectable with

the option registers, therefore allowing a maximum freedom of choice .

The following options can be selected at the time of programming the metal mask ROM.

19.1 Input / Output Ports

19.1.1 Port A Metal Options

Pull-up or no pull-up can be selected

for each port A input. A pull-up

selection is excluding a pull-down on

the same input.

Pull-down (default) or no pull-down

can be selected for each port A input.

A pull-down selection is excluding a

pull-up on the same input.

The total pull value (pull-up or pull-

down) is a series resistance out of

the resistance R1 and the switching

transistor. As a switching transistor

the user can choose between a high

impedance

(weak)

low

impedance (strong) switch. Weak,

strong or none must be chosen. The

default is strong. The default resistor

R1 value is 100 KOhm. The user

may choose a different value from

150 KOhm down to 0 Ohm. However

the value must first be checked and

agreed by EM Microelectronic Marin

SA.

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=100 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 : No pull-up

Figure 32. Port A Pull Options

Resistor R1

MPAPDweak[n]

Weak Pull-down

MPAPDstrong[n]

Strong Pull-down

MPAPUweak[n]

Weak Pull-up

MPAPUstrong[n]

Strong Pull-up

Pull-up Control

PA[n]

Terminal

100 KOhm

No Pull-up

No Pull-down

Pull-down Control

Input Circuitry

Option

Name

Strong

Pull-

down

Pull-

down

Value

Typ.100

Pull-

down

MPAPD[3]

PA3 input pull-down

100k

MPAPD[2]

PA2 input pull-down

100k

MPAPD[1]

PA1 input pull-down

100k

MPAPD[0]

PA0 input pull-down

100k

Option

Name

Strong

Pull-up

Weak

Pull-up

Value

typ.100k

Pull-up

MPAPU[3]

PA3 input pull-up

MPAPU[2]

PA2 input pull-up

MPAPU[1]

PA1 input pull-up

MPAPU[0]

PA0 input pull-up

EM6517 Datasheet(PDF) 48 Page - EM Microelectronic - MARIN SA

EM6517 Datasheet(HTML) 48 Page - EM Microelectronic - MARIN SA

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64

Datasheet Download

Link URL