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AN2021 Datasheet(PDF) 16 Page - STMicroelectronics

Part # AN2021
Description  The ST10F272B and ST10F272E are members of the STMicroelectronics
PDF  39 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2021 Datasheet(HTML) 16 Page - STMicroelectronics

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Modified features
AN2021
16/39
The handling of the RTCAIR and RTCSIR flags (bits 2 and 0 of the RTCCON register,
respectively) has also changed:
●
In the ST10F272, these flags are cleared by writing them to ‘1’
●
In the ST10F269, these flags are cleared by writing them to ‘0’
As these flags must be cleared by software when entering the corresponding interrupt
service routine, a change in the application code is needed.
ST10F272: RTCCON (F1C4h / E2h)
ESFR
Reset value: 0000h
15
14
13
12
11
10
9
8
7654
3
2
1
0
Reserved
OFF
32
OSC
RTC
OFF
Reserved
RTC
AEN
RTC
AIR
RTC
SEN
RTC
SIR
-R/W
RO
R/W
-
R/W
R/W
R/W
R/W
Table 9.
RTCCON register description
Bit
Function
Reset
value
RTCSIR
RTC Second Interrupt Request flag (every basic clock unit)
0: The bit was reset less than a Basic Clock unit ago.
1: The interrupt was triggered.
0
RTCSEN
RTC Second Interrupt Enable
0: RTC_SecIT is disabled.
1: RTC_SecIT is enabled; it is generated every basic clock unit.
0
RTCAIR
RTC Alarm Interrupt Request flag (when the alarm is triggered)
0: The bit was reset less than n Basic Clock units ago.
1: The interrupt was triggered.
0
RTCAEN
RTC Alarm Interrupt Enable
0: RTC_alarmIT is disabled.
1: RTC_alarmIT is enabled.
0
RTCOFF
RTC Switch Off bit
0: Clock oscillator and RTC keep on running even if ST10 is in Power Down
mode.
1: Clock oscillator is switched off when ST10 enters Power Down mode.
Additionally, when setting this bit, RTC dividers and counters are stopped
and registers can be written.
0
OSC
Oscillator Selection Flag
0: The clock oscillator used by the RTC is the main oscillator.
1: The clock oscillator used by the RTC is the low power 32 kHz oscillator.
0
OFF32
32 kHz Oscillator Switch Off bit
0: The 32 kHz oscillator is enabled. The RTC is clocked with 32 kHz if there
is a valid signal.
1: The 32 kHz oscillator is disabled. The RTC is clocked by the main
oscillator.
0



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