em6522 EM Microelectronic, em6522 Datasheet - Page 58

• Manufacturer Part Number: em6522
• Description: Mfp Version Of Em6622 Ultra Low Power Microcontroller With 4x32 Lcd Driver
• Manufacturer: EM Microelectronic

18.1.2 Port B Metal Options
(For ROM Version) 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. The default resistor R1
value is 100 KOhm.
Copyright © 2005, EM Microelectronic-Marin SA
Option
Name
MPBPD[3]
MPBPD[2]
MPBPD[1]
MPBPD[0]
Option
Name
MPBPU[3]
MPBPU[2]
MPBPU[1]
MPBPU[0]
R
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
Strong
Pull-
down
Strong
Pull-up
1
1
x
x
x
x
x
x
x
x
Figure 39. Port B Pull Options
Input Circuitry
Typ. 100k
Typ.100k
Value
100k
100k
100k
100k
100k
100k
100k
100k
value
3
3
R1
R1
OR
Pull-down Control
Terminal
Pull-up
down
58
PB[n]
Pull-
NO
Pull-up Control
No
4
4
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
Resistor R1
100 KOhm
VBAT
www.emmicroelectronic.com
No Pull-up
No Pull-down
EM6522
MPBPDstrong[n]
Strong Pull-down
MPBPUstrong[n]
Strong Pull-up