mc9s12e256 Freescale Semiconductor, Inc, mc9s12e256 Datasheet - Page 159

• Manufacturer Part Number: mc9s12e256
• Description: Hcs12 Microcontrollers 16-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Figure 3-50
analog module is enabled all associated digital output ports are disabled and all associated digital input
ports read “1”.
3.4.4
If the port is used as an output the Reduced Drive Register allows the configuration of the drive strength.
3.4.5
The Pull Device Enable Register turns on a pull-up or pull-down device. The pull device becomes active
only if the pin is used as an input or as a wired-OR output.
Freescale Semiconductor
Reduced Drive Register
Pull Device Enable Register
shows the state of digital inputs and outputs when an analog module drives the port. When the
Analog
Module
Figure 3-49. Illustration of I/O Pin Functionality
Figure 3-50. Digital Ports and Analog Module
Module
Enable
Module
Digital
DDRx
PTIx
PTx
Analog
Output
MC9S12E256 Data Sheet, Rev. 1.08
output enable
data out
module enable
0
1
Output
Digital
Digital
Input
0
1
0
1
PIM Boundary
1
0
1
0
Chapter 3 Port Integration Module (PIM9E256V1)
1
PAD
PAD
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