Chapter 2 Port Integration Module (S12XEP100PIMV1)
MC9S12XE-Family Reference Manual , Rev. 1.19
Freescale Semiconductor
171
NOTE
Due to internal synchronization circuits, it can take up to 2 bus clock cycles
until the correct value is read on PTL or PTIL registers, when changing the
DDRL register.
2.3.96
Port L Reduced Drive Register (RDRL)
2.3.97
Port L Pull Device Enable Register (PERL)
Address 0x0373
Access: User read/write
(1)
1. Read: Anytime.
Write: Anytime.
7
6
5
4
3
2
1
0
R
RDRL7
RDRL6
RDRL5
RDRL4
RDRL3
RDRL2
RDRL1
RDRL0
W
Reset
0
0
0
0
0
0
0
0
Figure 2-94. Port L Reduced Drive Register (RDRL)
Table 2-91. RDRL Register Field Descriptions
Field
Description
7-0
RDRL
Port L reduced drive
—Select reduced drive for outputs
This register configures the drive strength of output pins 7 through 0 as either full or reduced. If a pin is used as input
this bit has no effect.
1 Reduced drive selected (approx. 1/5 of the full drive strength).
0 Full drive strength enabled.
Address 0x0374
Access: User read/write
(1)
1. Read: Anytime.
Write: Anytime.
7
6
5
4
3
2
1
0
R
PERL7
PERL6
PERL5
PERL4
PERL3
PERL2
PERL1
PERL0
W
Reset
1
1
1
1
1
1
1
1
Figure 2-95. Port L Pull Device Enable Register (PERL)
Table 2-92. PERL Register Field Descriptions
Field
Description
7-0
PERL
Port L pull device enable
—Enable pull devices on input pins
These bits configure whether a pull device is activated, if the associated pin is used as an input. This bit has no effect
if the pin is used as an output. Out of reset all pull devices are enabled.
1 Pull device enabled.
0 Pull device disabled.
Because
of
an
order
from
the
United
States
International
Trade
Commission,
BGA-packaged
product
lines
and
part
numbers
indicated
here
currently
are
not
available
from
Freescale
for
import
or
sale
in
the
United
States
prior
to
September
2010:
S12XE
products
in
208
MAPBGA
packages