TMS570 pin status at reset

Jason Zhang

Hi team,
When TMS570 is under reset status (for example, something wrong causes the CPU entering into reset), what is the status of the pins on TMS570? High-Z or other status? Is there any difference between input pins and output pins? Or will all the pins be configured as GPIO and set as input pins in this condition?
Thanks for your help!

over 11 years ago

0 Jean-Marc Mifsud over 11 years ago

TI__Mastermind 22375 points

Jason,

This thread seems to be a duplicate. See my answer on:

http://e2e.ti.com/support/microcontrollers/hercules/f/312/p/342402/1197174.aspx#1197174

0 Jason Zhang over 11 years ago in reply to Jean-Marc Mifsud

TI__Expert 3690 points

Hi Jean-Marc,
I am sorry I may not describe my question very clearly. I see in the datasheet that when the device is out of reset, the default value of the control registers is listed. So I can figure out the condition of the peripherals’ pins, such as input or output and also its value. But I don't find the status of these pins when the device is under reset. In my customer's application, the reset condition will last for a while in some cases and they want to know the exactly status of all the peripherals’ pins. I learnt from your last responds that HET related pins will be set as inputs. Will all the other pins act like it? Working as input pins in reset? Or will it be the same as the condition when device just runs out of reset but before CPU runs the initialization code?

Thanks again for your time!

0 Jean-Marc Mifsud over 11 years ago in reply to Jason Zhang

TI__Mastermind 22375 points

Jason,

During Reset, all pins are forced as input, and a default Pull up or Pull down is applied.
This is defined in the device datasheet in the Terminal Function table. Here is an example:

Please have a look to the NOTE.

Arm-based microcontrollers

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TMS570 pin status at reset