What is nRSTIN pin?

[LMI2]

Posted on January 26, 2017 at 01:55

I have 'Getting started with STM32F4xxxx MCU hardware development' pdf. It is from December 2016, probably the newest. In page 30/40 Table 8 there are 5 pins needed for programming? Five pins. But on the next page in Fig 14, there are 6 pins going from JTAG connector to the CPU.

nRSTIN is not listed. What should I do with it?

#nrstin

[LMI2]

Posted on January 26, 2017 at 02:13

I read forward and noticed  schematic of an other STM32F4 device. There is also CPU reset signal. It is possible that nRSTIN is that. But it is not very obvious from the name, so it would help if someone is able to confirm what the signal really is.

[Imen.D]

Posted on January 26, 2017 at 07:49

Hello,

You can refer to the

schematic

and reference manual related to your device for more clarification about the pin assignement.

Regards

Imen

[Nor Sch]

Posted on January 26, 2017 at 10:42

nRSTIN (alias NRST) = 'not Reset' for the Controller

nJTRST = 'not JTAG Reset'

The Naming can vary a little bit, so you can find in same Documents from STM JNTRST and nJTRST meaning the same Pin.

[Imen.D]

Posted on January 26, 2017 at 11:18

Hello mich.lei,

Indeed,

nRSTIN is named '

NRST' in 

the other documents: datasheet, schematic.

Regards

Imen