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)
2.3.14
S12X_EBI ports Reduced Drive Register (RDRIV)
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
Access: User read/write
(1)
6
5
4
3
2
1
0
Address 0x000D (PRR)
7
R
RDPK
W
Reset
0
0
0
RDPE
RDPD
0
RDPC
0
RDPB
0
RDPA
0
0
0
0
= Unimplemented or Reserved
Figure 2-12. S12X_EBI ports Reduced Drive Register (RDRIV)
1. Read: Anytime. In emulation modes, read operations will return the data from the external bus, in all other modes the data source
is depending on the data direction value.
Write: Anytime. In emulation modes, write operations will also be directed to the external bus.
This register is used to select reduced drive for the pins associated with the S12X_EBI ports A, B, C, D,
E, and K. If enabled, the pins drive at approx. 1/5 of the full drive strength. The reduced drive function is
independent of which function is being used on a particular pin.
The reduced drive functionality does not take effect on the pins in emulation modes.
Table 2-15. RDRIV Register Field Descriptions
Field
7
RDPK
Description
Port K reduced drive—Select
reduced drive for outputs
This bit configures the drive strength of all Port K output pins 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.
Reserved—
Port E reduced drive—Select
reduced drive for outputs
This bit configures the drive strength of all Port E output pins 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.
Port D reduced drive—Select
reduced drive for outputs
This bit configures the drive strength of all output pins 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.
Port C reduced drive—Select
reduced drive for outputs
This bit configures the drive strength of all output pins 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.
6-5
4
RDPE
3
RDPD
2
RDPC
MC9S12XE-Family Reference Manual , Rev. 1.19
116
Freescale Semiconductor
