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EM6517 Datasheet(PDF) 49 Page - EM Microelectronic - MARIN SA

Part # EM6517
Description  MFP version of EM6617 Ultra Low Power Microcontroller with ADC and EEPROM
PDF  64 Pages
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Manufacturer  EMMICRO [EM Microelectronic - MARIN SA]
Direct Link  http://www.emmicroelectronic.com
Logo EMMICRO - EM Microelectronic - MARIN SA

EM6517 Datasheet(HTML) 49 Page - EM Microelectronic - MARIN SA

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EM6517
03/02 REV. C/448
Copyright
 2002, EM Microelectronic-Marin SA
49
www.emmicroelectronic.com
19.1.2 Port B Metal Options
Pull-up or no pull-up can be
selected for each port B input. The
pull-up is only active in Nch. open
drain mode.
Pull-down or no pull-down can be
selected for each port B 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 : Strong pull-up
with R1=100 KOhm
Figure 33. Port B Pull Options
Resistor R1
MPBPDweak[n]
Weak Pull-down
MPBPDstrong[n]
Strong Pull-down
MPBPUweak[n]
Weak Pull-up
MPBPUstrong[n]
Strong Pull-up
Pull-Up Control
PB[n]
Terminal
100 KOhm
Pull-down Control
or
Block
No Pull-up
No Pull-down
Input Circuitry
Option
Name
Strong
Pull-
down
Weak
Pull-
down
R1
Value
Typ.100k
No
Pull-
down
1
2
3
4
MPBPD[3]
PB3 input pull-down
X
100k
MPBPD[2]
PB2 input pull-down
X
100k
MPBPD[1]
PB1 input pull-down
X
100k
MPBPD[0]
PB0 input pull-down
X
100k
Option
Name
Strong
Pull-up
Weak
Pull-up
R1
value
Typ. 100k
NO
Pull-up
1
2
3
4
MPBPU[3]
PB3 input pull-up
X
100k
MPBPU[2]
PB2 input pull-up
X
100k
MPBPU[1]
PB1 input pull-up
X
100k
MPBPU[0]
PB0 input pull-up
X
100k



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