Xingxing.li: Created page with " === '''RTC Battery:''' === – Typical voltage: 3V – Normal discharge capacity: 210mAH === '''HW Pin define：''' === {| border="1" cellpadding="1" cellspacing="1" styl..."

2025-06-04T08:33:51Z

Created page with " === '''RTC Battery:''' === – Typical voltage: 3V – Normal discharge capacity: 210mAH === '''HW Pin define：''' === {| border="1" cellpadding="1" cellspacing="1" styl..."

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=== '''RTC Battery:''' ===

– Typical voltage: 3V

– Normal discharge capacity: 210mAH

=== '''HW Pin define：''' ===

{| border="1" cellpadding="1" cellspacing="1" style="width: 500px;"
|-
| '''Pin'''
| '''Pin Name'''
|-
| 1
| +VDD_RTC
|-
| 2
| GND
|}

=== '''SW Function''' ===

Set the system to the current time then set the RTC.
<pre># date 021710452016 && hwclock -w && date
Wed Feb 17 10:45:00 UTC 2016
Wed Feb 17 10:45:01 UTC 2016
</pre>

Set one incorrect time, then read RTC to verify.
<pre># date 010100002000 && hwclock -r && date
Sat Jan 1 00:00:00 UTC 2000
2016-02-17 10:49:08.417688+00:00
Sat Jan 1 00:00:00 UTC 2000
</pre>

Restore the RTC time to system time
<pre># hwclock -s && date
Wed Feb 17 10:46:58 UTC 2016
</pre>

ASR-A501 RTC BAT - Revision history

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