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EM6617 Datasheet(PDF) 48 Page - EM Microelectronic - MARIN SA

Part No. EM6617
Description  Ultra Low Power Microcontroller with ADC AND EEPROM
Download  65 Pages
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Maker  EMMICRO [EM Microelectronic - MARIN SA]
Homepage  http://www.emmicroelectronic.com
Logo EMMICRO - EM Microelectronic - MARIN SA

EM6617 Datasheet(HTML) 48 Page - EM Microelectronic - MARIN SA

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EM6617
Copyright
© 2005, EM Microelectronic-Marin SA
48
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)
or
a
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
OR
Input Circuitry
Option
Name
Strong
Pull-
down
W
Pull-
down
R1
Value
Typ.100
k
No
Pull-
down
1
2
3
4
MPAPD[3]
PA3 input pull-down
MPAPD[2]
PA2 input pull-down
MPAPD[1]
PA1 input pull-down
MPAPD[0]
PA0 input pull-down
Option
Name
Strong
Pull-up
Weak
Pull-up
R1
Value
typ.100k
No
Pull-up
1
2
3
4
MPAPU[3]
PA3 input pull-up
MPAPU[2]
PA2 input pull-up
MPAPU[1]
PA1 input pull-up
MPAPU[0]
PA0 input pull-up


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