MEC1404 Datasheet, PDF (413/572 Pages) Microchip Technology – Keyboard and Embedded Controller Products for Notebook PC

MEC140X/1X
TABLE 30-3: EC-ONLY REGISTER SUMMARY
Offset
0h
4h
8h
Ch
10h
14h
Register Name
Reserved
KSO Select Register
KSI INPUT Register
KSI STATUS Register
KSI INTERRUPT ENABLE Register
Keyscan Extended Control Register
30.11.1 KSO SELECT REGISTER
Offset ^04h
Bits
Description
Type
31:4 Reserved
R
7 KSO_INVERT
R/W
This bit controls the output level of KSO pins when selected.
If all KSO pins are active by programming KSO_SELECT to a
value greater than 11h the KSO_INVERT controls the state of the
pins as follows:
1= All KSOs driven low when selected
0= All KSOs driven high when selected.
Otherwise, if a single KSO line is selected via the KSO_SELECT
bit field or all KSO lines are selected via the KSO_ALL bit then the
KSO_INVERT controls the state of the pins as follows:
0= KSO[x] driven low when selected
1= KSO[x] driven high when selected.
Note:
The active state of the KSO pins is determined by the
KSO_INVERT bit as is shown in Table 30-5, "Keyboard
Scan Out Control Summary"
6 KSEN
R/W
This field enables and disables keyboard scan
0= Keyboard scan enabled
1= Keyboard scan disabled. All KSO output buffers disabled.
Default
-
0b
Reset
Event
-
nSYSR
ST
1h
nSYSR
ST
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DS00001956D-page 413