MEC1322 Datasheet, PDF (234/456 Pages) Microchip Technology – Keyboard and Embedded Controller for Notebook PC

MEC1322
TABLE 19-7:
Offset
09h
0Ah
0Bh
0Ch
0Dh
0Eh
0Fh
10h
14h
18h
1Ch
20h
RUNTIME REGISTER SUMMARY (CONTINUED)
Register Name (Mnemonic)
Year Register
Register A
Register B
Register C
Register D
(reserved)
(reserved)
RTC Control Register
Week Alarm Register
Daylight Savings Forward Register
Daylight Savings Backward Register
MCHP Reserved
Note: This extended register set occupies offsets that have historically been used as CMOS RAM. Code ported
to use this block should be examined to ensure that it does not assume that RAM exists in this block.
19.11.1 SECONDS REGISTER
Offset ^00h
Bits
Description
Type
7:0 SECONDS
R/W
Displays the number of seconds past the current minute, in the range
0--59. Presentation may be selected as binary or BCD, depending on
the DM bit in Register B. Values written must also use the format
defined by the current setting of the DM bit.
Default
00h
Reset
Event
RTC_R
ST
19.11.2 SECONDS ALARM REGISTER
Offset ^01h
Bits
Description
7:0 SECONDS_ALARM
Holds a match value, compared against the Seconds Register to trig-
ger the Alarm event. Values written to this register must use the for-
mat defined by the current setting of the DM bit in Register B. A value
of 11xxxxxxb written to this register makes it don’t-care (always
matching).
Type
R/W
Default
00h
Reset
Event
RTC_R
ST
DS00001719D-page 234
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