EM6517 ETC, EM6517 Datasheet - Page 50

• Manufacturer Part Number: EM6517
• Description: 4 BIT MICROCONTROLLER
• Manufacturer: ETC

19.1.3 Port C Metal Options
Pull-up or no pull-up can be selected
for each port C input. The pull-up is
only active in Nch. open drain mode.
Pull-down or no pull-down can be
selected for each port C input.
The total pull value (pull-up or pull-
down) is a series resistance out of the
resistance
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
Microelectronic Marin SA. Refer also to
chapter
© EM Microelectronic-Marin SA, 09/99, Rev. A/277
50
Option
Name
MPCD[3]
MPCD[2]
MPCD[1]
MPCD[0]
Option
Name
MPCU[3]
MPCU[2]
MPCU[1]
MPCU[0]
checked
R1
PC3 input pull-down
PC2 input pull-down
PC1 input pull-down
PC0 input pull-down
PC3 input pull-up
PC2 input pull-up
PC1 input pull-up
PC0 input pull-up
and
and
agreed
the
FOR ENGINEERING ONLY
switching
by
EM
Strong
Pull-
down
Strong
Pull-up
1
X
X
X
X
1
X
X
X
X
Figure 34. Port C Pull Options
Input Circuitry
Pull-up
Weak
down
weak
Pull-
2
2
Typ. 100k
Typ.100k
Value
Value
100k
100k
100k
100k
100k
100k
100k
100k
3
3
OR
R1
R1
Pull-down Control
Terminal
Pull-up Control
PC[n]
Block
Pull-up
Down
Pull-
NO
NO
4
4
Resistor 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-
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
No Pull-up
No Pull-down
EM6517
MPCDstrong[n]
Strong Pull-down
MPCDweak[n]
Weak Pull-down
MPCUweak[n]
Weak Pull-up
MPCUstrong[n]
Strong Pull-up