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EM6626 Datasheet(PDF) 55 Page - EM Microelectronic - MARIN SA

Part # EM6626
Description  Ultra Low Power Microcontroller with 4x32 LCD Driver
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Manufacturer  EMMICRO [EM Microelectronic - MARIN SA]
Direct Link  http://www.emmicroelectronic.com
Logo EMMICRO - EM Microelectronic - MARIN SA

EM6626 Datasheet(HTML) 55 Page - EM Microelectronic - MARIN SA

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EM6626
Copyright
© 2005, EM Microelectronic-Marin SA
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18. 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 .See chapter: Option Register Memory
Map.
The following options can be selected at the time of programming the metal mask ROM, except the LCD Segment
allocation which is defined using the interconnect metal2 mask.
18.1 Input / Output Ports
18.1.1 Port A Metal Options
18.1.2 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. Refer also to chapter 19.2 and 19.4 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=100 KOhm
--> Total value of typ. 102 KOhm at
VDD=3.0V
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=100 KOhm
--> Total value of typ. 103 KOhm at
VDD=3.0
Figure 37. 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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