Specifications

96 AMD Geode™ GeodeROM Functional Specification
System Time and Date
32087C
Returns:
Related Functions:
INT 1Ah "Function 01h - Set System Time" on page 96.
INT 1Ah "Function 02h - Get Real-Time Clock Time Status" on page 96.
11.1.2 Function 01h - Set System Time
Description:
Sets the 4-byte count of the number of timer ticks that have occurred since midnight. The value is maintained in the
BIOS Data Area (40:6Ch). It does not modify the rollover byte, stored at 40:70h.
Passed:
Returns:
None.
Related Functions:
INT 1Ah "Function 03h - Set Real-Time Clock Time" on page 97.
11.1.3 Function 02h - Get Real-Time Clock Time Status
Description:
Returns the time value stored in the system’s real-time clock, in hours, minutes, and seconds.
Passed:
Returns:
Related Functions:
INT 1Ah "Function 01h - Set System Time" on page 96.
INT 1Ah "Function 03h - Set Real-Time Clock Time" on page 97.
INT 1Ah "Function 04h - Get Real-Time Clock Date Status" on page 97.
Parameter Description
CX The most significant two bytes of the 4-byte count
DX The least significant two bytes of the 4-byte count
AL Rollover value, nonzero if midnight has passed since the last time the count was read
Parameter Description
AH 01h
CX The most significant two bytes of the 4-byte count
DX The least significant two bytes of the 4-byte count
Parameter Description
AH 02h
Parameter Description
CH The hour of the current time, in BCD, stored in the RTC
CL The minutes of the current time, in BCD, stored in the RTC
DH The seconds of the current time, in BCD, stored in the RTC
DL If 00h, the RTC ignores daylight savings time
If 01h, the RTC adjusts for daylight savings time