Lenovo ThinkPad 560 TP 560Z Technical Reference Manual - Page 40
Status Register C X, Bit 0, Bits 3-0, ThinkPad 560Z System Board
View all Lenovo ThinkPad 560 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 40 highlights
Bit 0 If set to 1, this bit enables the daylight-saving-time mode. If set to 0, this bit disables the daylight-saving-time mode, and the clock reverts to standard time. The system initializes this bit to 0. Status Register C (X'00C') Bit Function 7 Interrupt request flag 6 Periodic interrupt flag 5 Alarm interrupt flag 4 Update-ended interrupt flag 3-0 Reserved Figure 2-18. Status Register C (X'00C') Note: Interrupts are enabled by bits 6, 5, and 4 in status register B. Bit 7 If set to 1, this bit indicates that an interrupt has occurred; bits 6, 5, and 4 indicate the type of interrupt. Bit 6 If set to 1, this bit indicates that a periodic interrupt has occurred. Bit 5 If set to 1, this bit indicates that an alarm interrupt has occurred. Bit 4 If set to 1, this bit indicates that an update-ended interrupt has occurred. Bits 3-0 These bits are reserved. Status Register D (X'00D') Bit Function 7 Valid RAM 6-0 Reserved Figure 2-19. Status Register D (X'00D') Bit 7 Bits 6-0 This read-only bit monitors the internal battery. If set to 1, this bit indicates that the real-time clock has power. If set to 0, it indicates that the real-time clock has lost power and the data in CMOS is no longer valid. These bits are reserved. 2-22 ThinkPad 560Z System Board