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EM6821 датащи(PDF) 57 Page - EM Microelectronic - MARIN SA

номер детали EM6821
подробное описание детали  Ultra Low Power uController with 4x20 LCD Driver
PDF  68 Pages
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производитель  EMMICRO [EM Microelectronic - MARIN SA]
домашняя страница  http://www.emmicroelectronic.com
Logo EMMICRO - EM Microelectronic - MARIN SA

EM6821 датащи(HTML) 57 Page - EM Microelectronic - MARIN SA

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EM6821
Copyright
© 2005, EM Microelectronic-Marin SA
57
www.emmicroelectronic.com
18.1.3 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 90 KOhm. The
user may choose a different value
lower than 90 kOhm. However the
value must first be checked and
agreed
by
EM
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 39. 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.90k
No
Pull-
down
1
2
3
4
MPBPD[3]
PB3 input pull-down
MPBPD[2]
PB2 input pull-down
MPBPD[1]
PB1 input pull-down
MPBPD[0]
PB0 input pull-down
Option
Name
Strong
Pull-up
Weak
Pull-up
R1
value
Typ. 90k
NO
Pull-up
1
2
3
4
MPBPU[3]
PB3 input pull-up
MPBPU[2]
PB2 input pull-up
MPBPU[1]
PB1 input pull-up
MPBPU[0]
PB0 input pull-up



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