EM6517 ETC, EM6517 Datasheet - Page 49

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

19.1.2 Port B Metal Options
Pull-up or
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
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
Microelectronic Marin SA
Option
Name
MPBPD[3]
MPBPD[2]
MPBPD[1]
MPBPD[0]
Option
Name
MPBPU[3]
MPBPU[2]
MPBPU[1]
MPBPU[0]
and
no pull-up can be
(weak)
PB3 input pull-down
PB2 input pull-down
PB1 input pull-down
PB0 input pull-down
PB3 input pull-up
PB2 input pull-up
PB1 input pull-up
PB0 input pull-up
agreed
or
by
a
FOR ENGINEERING ONLY
low
EM
Strong
Pull-
down
Strong
Pull-up
1
X
X
X
X
1
X
X
X
X
Figure 33. Port B Pull Options
Input Circuitry
Pull-up
Weak
Weak
down
Pull-
2
2
Typ. 100k
Typ.100k
or
Value
100k
100k
100k
100k
value
100k
100k
100k
100k
Pull-down Control
3
3
R1
R1
Terminal
Pull-Up Control
PB[n]
Block
Pull-up
down
Pull-
NO
No
4
4
100 KOhm
Resistor R1
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
© EM Microelectronic-Marin SA, 09/99, Rev. A/277
No Pull-up
No Pull-down
EM6517
MPBPDstrong[n]
Strong Pull-down
MPBPDweak[n]
Weak Pull-down
MPBPUweak[n]
Weak Pull-up
MPBPUstrong[n]
Strong Pull-up
49