Maxim Integrated MAXQ Family Users Guide: MAXQ2010 Supplement - Manual (Page 65)

MAXQ Family User’s Guide:
MAXQ2010 Supplement
14-3
Figure 14-2. RTC Prescaler and Trim
Figure 14-3. RTC Trim Adjustment (TSGN = 1)
Figure 14-4. RTC Trim Adjustment (TSGN = 0)
PRESCALER
TRIM
ADJUSTMENT
LOGIC
4096Hz
TSGN
TRIM[3:0]
256Hz
10-SECOND CLOCK
1s - 73.2 µs 1s - 73.2 µs
1 2 3
ADJUSTMENT MADE HERE
(TSGN = 1)
10 11 12
1s - 73.2 µs
SECONDS TIME (t)
1Hz
OUTPUT
1s + 732 µs
AVERAGE = [(1 - 73.2 µs) x 9 + (1 + 732µs)]/10 = 1s
1s + 73.2 µs 1s + 73.2 µs
1Hz
OUTPUT
1 2 3 10 11 12
1s - 732 µs 1s + 73.2 µs
AVERAGE = [(1s + 73.2 µs) x 9 + (1 - 732µs)]/10 = 1s
ADJUSTMENT MADE HERE
(TSGN = 0)
SECONDS TIME (t)