Wakeup Timer Interrupt Interval (Example); Wakeup Timer Interrupt Timing Chart; Table 51 Wakeup Timer Interrupt Interval - Epson RX8804CE Applications Manual

RX8804CE

8.3.4. Wakeup Timer Interrupt Interval (example)

Table 51 Wakeup Timer Interrupt Interval

Preset Value
TSEL1,0 = 0,0
0
1
2
•
•
•
41
82
128
192
205
320
410
640
820
1229
1280
1920
2048
2560
3200
3840
4095
•
•
•
16777215

8.3.5. Wakeup Timer Interrupt Timing Chart

Fixed-cycle timer starts
(1)
TE bit
TIE bit
/INT output
TF bit
period
Event occurs (1)
• • •
 When the TE bit value changes from "0" to "1" the fixed-cycle timer function starts.
The counter always starts counting down from the preset value when the TE value changes from "0" to "1".
RTC internal operation
Write operation via I
Figure 17 Wakeup Timer Timing Chart
4096 Hz
TSEL1,0 = 0,1
−
244.14 s
488.28 s
•
•
•
10.010 ms
20.020 ms
31.250 ms
46.875 ms
50.049 ms
78.125 ms
100.10 ms
156.25 ms
200.20 ms
300.05 ms
312.50 ms
468.75 ms
500.00 ms
625.00 ms
0.7813 s
0.9375 s
0.9998 s
•
•
•
4096 s 3 days,49 min.4 s
Operation of fixed-cycle timer
" 1 "
(5)
(6)
tRTN
(4)
(3)
period
(2)
001 h → 000 h
2
C
Source clock
64 Hz "Second" update
TSEL1,0 = 1,0
−
15.625 ms
31.25 ms
•
•
•
640.63 ms
1.281 s
2.000 s
3.000 s
3.203 s
5.000 s
6.406 s
10.000 s
12.813 s
19.203 s
20.000 s
30.000 s
32.000 s
40.000 s
50.000 s
60.000 s
63.984 s
•
•
•
194 days
(9)
tRTN
tRTN
(8)
 Even when the TF
bit is cleared to zero,
the /INT status does
not change.
period
Page - 27
"Minute" update
TSEL1,0 = 1,1
− −
1 s
2 s
• •
• •
• •
41 s 41 min
82 s 82 min
128 s 128 min
192 s 192 min
205 s 205 min
320 s 320 min
410 s 410 min
640 s 640 min
820 s 820 min
1229 s 1229 min
1280 s 1280 min
1920 s 1920 min
2048 s 2048 min
2560 s 2560 min
3200 s 3200 min
3840 s 3840 min
4095 s 4095 min
• •
• •
• •
32 years
Fixed-cycle timer stops
(7)
(7)
 Even when the TE bit
is cleared to zero, /INT
tRTN
remains low during the
tRTN time.
period
(7)
1 min
2 min
" 1 "
" 0 "
" 1 "
" 0 "
Hi-Z
" L "
" 1 "
" 0 "
ETM59E-05