14. Functions
RX8130CE
Jump to
ETM50E-07
Seiko Epson Corporation
27
The example of the error of the first countdown: A value to preset is 0004h
Cycle error
初回周期誤差
TE
Designated cycle
Internal source clock
TF
3
2
1
4
Down counter
4
Figure 17 Wakeup timer initial sequence
Inside counter block diagram
4096Hz
Resister
Timer Counter 0
Timer Counter 1
TSTP
source
clock
selector
64Hz
1Hz
1/60
1/60
1Hz
1/60Hz
1/3600Hz
TSTP
timer stop signal
TSTP,TBKE,TBKON bit
Note:
The resolution of the count value depends on the source clock
Figure 18 Wakeup timer block diagram
3) TE bit
(
Timer Enable
)
When TE bit is "0", the default (preset) can be checked by reading this register.
Table 17 Wakeup timer control
TE
Data
Description
Write
0
Stops wakeup timer interrupt function.
Clearing this bit to zero does not enable the /IRQ low output status to be cleared (to Hi-z)
.
1
Starts wakeup timer interrupt function.
The countdown that starts when the TE bit value changes from "0"
to "1" always begins from the
preset value.
4) TF bit
(
Timer Flag
)
This is a flag bit that retains the result when a wakeup timer interrupt event is detected.
