Elan eSL Series, Руководство пользователя

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Chapter 3
68
••••
Peripheral Control eSL/eSLS Series (+ eSLZ000) User’s Manual
3.2.3 RTC Timing
RTC0~3 Timer interrupts are invoked by rising edge of RTC clock.
RTC Timer wake up are invoked by rising /falling both edge of RTC clock at
Green mode.
When RTC wake up takes place from Green or Sleep mode to Fast mode and
RTC interrupt enable flag is set, the RTC interrupt is invoked at the same time.
The following are the equations on RTC wake up period:









< + =
= =
> =
> − − − − − −
> − − − − − −
> − − − − − −
) (
2
1
2
1
) (
2
1 1
) (
2
1
2
1
_
_
_
c Case T
F
if
F
T T
b Case T
F
if
F
T
a Case T
F
if
F
T
up Warm
RTCX RTCX
up Warm period up Wake
up Warm
RTCX RTCX
period up Wake
up Warm
RTCX RTCX
period up Wake
；
；
；
Where
:
1.
period Wakeup
T
_
is the wake up period at different conditions
2.
Up Warm
T
(Warm up time) is a variable that can be set by WUPS in CPUCON
control register.
3.
RTCX
F
is the Frequency of RTC0 ~ 3
Case(a) Timing Diagram (RTCS0=“00” and WUPS=“00”)
W arm Up / Interrupt
Timing at Green mode
Interrupt Timing at
Fast / Slow mode
W arm up + P Sleep
1/2F
RTCX
=64ms
32.001ms
WKUP By
Rising Edge
WKUP By
Falling Edge
WKUP By
Rising Edge
32.001ms
W arm up + P Sleep
Interrupt Occurs
Only By Rising Edge
Interrupt
Occurs
T
Wakeup period
= 1/(2F
RTCX
)
Figure 3-3a RTC Wake-up Timing Diagram in Case(a)