S912XEG128J2VAL
| Model | S912XEG128J2VAL |
| Description | IC,MICROCONTROLLER,16-BIT,CPU12 CPU,CMOS,QFP,112PIN,PLASTIC |
| PDF file | Total 1327 pages (File size: 7M) |
| Chip Manufacturer | ROCHESTER |
Chapter 2 Port Integration Module (S12XEP100PIMV1)
Table 2-28. DDRS Register Field Descriptions
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
Field
7-0
DDRS
Description
Port S data direction—
This register controls the data direction of pins 7 through 0.This register configures each Port S pin as either input
or output.
If SPI0 is enabled, the SPI0 determines the pin direction.
Refer to SPI section for details.
If the associated SCI transmit or receive channel is enabled this register has no effect on the pins. The pin is forced
to be an output if a SCI transmit channel is enabled, it is forced to be an input if the SCI receive channel is enabled.
The data direction bits revert to controlling the I/O direction of a pin when the associated channel is disabled.
1 Associated pin is configured as output.
0 Associated pin is configured as input.
NOTE
Due to internal synchronization circuits, it can take up to 2 bus clock cycles
until the correct value is read on PTS or PTIS registers, when changing the
DDRS register.
2.3.32
Port S Reduced Drive Register (RDRS)
Access: User read/write
(1)
6
5
4
3
2
1
0
Address 0x024B
7
R
RDRS7
W
Reset
0
0
0
0
0
0
0
0
RDRS6
RDRS5
RDRS4
RDRS3
RDRS2
RDRS1
RDRS0
Figure 2-30. Port S Reduced Drive Register (RDRS)
1. Read: Anytime.
Write: Anytime.
Table 2-29. RDRS Register Field Descriptions
Field
7-0
RDRS
Description
Port S 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.
MC9S12XE-Family Reference Manual , Rev. 1.19
Freescale Semiconductor
127
