MEC1404 Datasheet, PDF (473/572 Pages) Microchip Technology – Keyboard and Embedded Controller Products for Notebook PC

MEC140X/1X
4. Set the DAC Control Register bit to ‘1’, enabling the DAC
The following sequence should be used to update the DAC output if the DAC is already enabled:
1. Program the DAC Data Register with the required data value. No other action is required.
The following sequence should be used to disable the DAC:
1. Set the DAC Control Register bit to ‘0’,. No other action is required.
39.11 EC-Only Registers
The registers listed in the EC-Only Register Summary table are for a single instance of the Keyboard Scan Interface.
The addresses of each register listed in this table are defined as a relative offset to the host “Base Address” defined in
the EC-Only Register Base Address Table.
TABLE 39-2: EC-ONLY REGISTER BASE ADDRESS TABLE
Block Instance
DAC
DAC
Instance
Number
0
1
Host
EC
EC
Address Space
32-bit internal
address space
32-bit internal
address space
Base Address
8000h
8040h
The Base Address indicates where the first register can be accessed in a particular address space for a block instance.
TABLE 39-3: EC-ONLY REGISTER SUMMARY
Offset
0h
4h
8h
Ch
10h
14h
18h
1Ch
20h
24h
28h
2Ch
30h
Register Name
DAC Activate Register
DAC Configuration Register
DAC Control Register
DAC Data Register
Microchip Reserved
Microchip Reserved
Microchip Reserved
Microchip Reserved
Microchip Reserved
Microchip Reserved
Microchip Reserved
Microchip Reserved
Microchip Reserved
Microchip Reserved registers must not be modified.
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DS00001956D-page 473