EM6520 EM Microelectronic, EM6520 Datasheet - Page 44

• Manufacturer Part Number: EM6520
• Description: MFP version of EM6620 Ultra Low Power Microcontroller 4x8 LCD Driver
• Manufacturer: EM Microelectronic

16 Mask Options
Most options which in many µControllers are realized as metal mask options are directly user selectable with the
option registers, therefore allowing a maximum freedom of choice .See chapter: 14.
The following options can be selected at the time of programming the metal mask ROM, except the LCD
Segment allocation which is defined using the interconnect metal2 mask. The EM6520 is delivered with the
default metal mask settings. If you need other mask settings please contact EM Marin.
16.1 Input / Output Ports
16.1.1 Port A Metal Options
(For ROM Version) Pull-up or no pull-
up can be selected for each port A
input. A pull-up selection is excluding
a pull-down on the same input.
Pull-down (default) or no pull-down
can be selected for each port A input.
A pull-down selection is excluding a
pull-up on the same 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.
EM Microelectronic-Marin SA CH-2074 Marin, Switzerland, Tel. [phone], Fax. [phone]
44
Option
Name
MPAPD[3]
MPAPD[2]
MPAPD[1]
MPAPD[0]
Option
Name
MPAPU[3]
MPAPU[2]
MPAPU[1]
MPAPU[0]
PA3 input pull-down
PA2 input pull-down
PA1 input pull-down
PA0 input pull-down
PA3 input pull-up
PA2 input pull-up
PA1 input pull-up
PA0 input pull-up
Strong
Pull-
down
Strong
Pull-up
1
1
x
x
x
x
Figure 28. Port A Pull Options
Input Circuitry
Typ.100
typ.100k
Value
100k
100k
100k
100k
Value
100k
100k
100k
100k
R1
R1
k
3
3
OR
Pull-up
down
Pull-down Control
Pull-
No
4
Terminal
No
4
x
x
x
x
PA[n]
Pull-up Control
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 : No pull-up
Resistor R1
100 KOhm
© EM Microelectonic-Marin SA , 12/98 Rev. A/246
A COMPANY OF
VBAT
No Pull-up
No Pull-down
EM6520
MPAPDstrong[n]
Strong Pull-down
MPAPUstrong[n]
Strong Pull-up