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Freescale Semiconductor KIT912F634EVME Evaluation Kit KIT912F634EVME KIT912F634EVME Datenbogen

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Functional Description and Application Information 
High Voltage Inputs - Lx 
MM912F634
Freescale Semiconductor
123
4.16
High Voltage Inputs - Lx
Six High Voltage capable inputs are implemented with the following features:
•
Digital Input Capable
•
Analog Input Capable with selectable voltage divider.
•
Wake-up Capable during Low Power mode. See 
When used as analog inputs to sense voltages outside the module a series resistor must be used on the used input. When a Lx 
input is not selected in the analog multiplexer, the voltage divider is disconnected from that input. When a Lx input is selected in 
the analog multiplexer, it will be disconnected in low power mode if configured as Wake-up input. Unused Lx pins are 
recommended to be connected to GND to improve EMC behavior. 
4.16.1
Register Definition
4.16.1.1
Lx Status Register (LXR)
4.16.1.2
Lx Control Register (LXCR)
Table 140. Lx Status Register (LXR)
0x08
Access: User read
7
6
5
4
3
2
1
0
R
0
0
L5
L4
L3
L2
L1
L0
W
Note:
109. Offset related to 0x0200 for blocking access and 0x300 for non blocking access within the global address space.
Table 141. LXR - Register Field Descriptions
Field
Description
L[5-0]
Lx Status Register - Current Digital State of the Lx Input
Table 142. Lx Control Register (LXCR)
Offset
0x09
Access: User read/write
7
6
5
4
3
2
1
0
R
0
0
L5DS
L4DS
L3DS
L2DS
L1DS
L0DS
W
Reset
0
0
0
0
0
0
0
0
Note:
110. Offset related to 0x0200 for blocking access and 0x300 for non blocking access within the global address space.
Table 143. LXCR - Register Field Descriptions
Field
Description
5-0
L[5-0]DS
Analog Input Divider Ratio Selection - Lx
0 - 2 (typ.)
1 - 7.2 (typ)