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Today, when I was seeing in STM32F103RET6 datasheet I saw some odd things(also, they are odd for me, probably you have enough information about these). if look in 12P of datasheet, you will see this picture:

Performance line block diagram

I have determined 3 point of it and have several question about these three point:

  • for number one: What is this part and What does it do? (I mean "Obl")
  • for number two: How does this power switch work?(I mixed up, Does it work automatically?)
  • for number three: What's the mean of the "IF" word? If you consider, even, you will see the "IF" for ADC units(not just for DAC).
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1 Answer 1

Reset to default
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OBL = Option Byte Loader. Found it in this datasheet. At page 19 is a short description of what it does.

Probably that switch is automatically triggered in standby/battery mode.

In Radiofrequency applications, IF usually means Intermediate Frequency. But in this case:

IF = Interface as PeterJ suggested in the first comment.

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    \$\begingroup\$ Agree with 1 & 2 and was about to post a similiar answer, but I thought IF being interface might make more sense in that context when it applies to the ADC as well? Not 100% sure though. \$\endgroup\$
    – PeterJ
    Apr 20, 2014 at 12:40
  • \$\begingroup\$ I thought about the sampling frequency when I said Intermediate Frequency. I'm not sure either. \$\endgroup\$
    – Cornelius
    Apr 20, 2014 at 12:42
  • \$\begingroup\$ For 2, then when the MCU is in other mode(except active mode), it will use battery, is it correct? \$\endgroup\$
    – Roh
    Apr 20, 2014 at 12:44
  • \$\begingroup\$ @Roh it will use battery power for running a 32kHz oscillator needed by RTC and to preserve registers. \$\endgroup\$
    – Cornelius
    Apr 20, 2014 at 12:46
  • \$\begingroup\$ @Cornelius For everytime? I mean, it won't use battery power in normal mode of MCU. is it correct? \$\endgroup\$
    – Roh
    Apr 20, 2014 at 12:49

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