MEC1404 Datasheet, PDF (435/572 Pages) Microchip Technology – Keyboard and Embedded Controller Products for Notebook PC

33.12.1 EC DATA REGISTER
Offset ^100h
Bits
31:8 TIME_STAMP
7:0 EC_DATA
Description
MEC140X/1X
Type
R
R
Default
0h
0h
Reset
Event
nSYSR
ST
nSYSR
ST
33.12.2 CONFIGURATION REGISTER
Offset ^104h
Bits
Description
31:8 Reserved
7:6 FIFO_THRESHOLD
This field determines the threshold for the Port 80 BIOS Debug
Port Interrupts.
3=14 entry threshold
2=8 entry threshold
1=4 entry threshold
0=1 entry threshold
5 TIMER_ENABLE
When the TIMER_ENABLE bit is ‘1’, the 24-bit Timer is actively
counting at a rate determined by the TIMEBASE_SELECT
bits. When the TIMER ENABLE bit is ‘0’, counting is stopped.
4:3 TIMEBASE_SELECT
The TIMEBASE SELECT bits determine the clock for the 24-bit
Timer.
3=48 MHz Ring Oscillator/64
2=48 MHz Ring Oscillator/32
1=48 MHz Ring Oscillator/16
0=48 MHz Ring Oscillator/8
2 RESET_TIMESTAMP
When this field is written with a ‘1’, the 24-bit Timer is reset to ‘0’.
Writing zero to the Count Register has the same effect.
Writes of a ‘0’ to this field have no effect. Reads always return ‘0’.
Type
R
R/W
R/W
R/W
W
Default
-
0h
Reset
Event
-
nSYSR
ST
0h
nSYSR
ST
0h
nSYSR
ST
-
nSYSR
ST
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DS00001956D-page 435