what‘s difference between #0x7F and #0x6F in MC9S12ZVLRM

[jingfang]

It directly affects current in Stop Mode.

[lama]

Hi,

 I have checked an errata list.
Have you applied the ADC errata solution...
https://www.nxp.com/docs/en/errata/MSE9S12ZVL_0N22G.pdf

Best regards,

Ladislav

[lama]

Hi,

You should check whether you are in the stop mode.

Of course it affect Stop mode.

S X – I N Z V C
1 1 - 1  /   /  /  / reset status; Only setup function setup bits S,X,I are important in this case

0x7F - CCR = 0B0111XXXX - clears only S bit, enables Stop instruction and all interrupts are globally masked (disabled), none of the interrupt wakes the MCU up from the STOP mode

0x6F - CCR = 0B0110XXXX - enables STOP instruction as well as all I-bit maskable interrupts. These interrupt wakes the MCU up from the STOP mode.

So it looks like you MCU is periodically entered to STOP mode and woken up from it by some of the enabled interrupts.

Best regards,

Ladislav

[jingfang]

Dear Ladislav,

         Thanks a lot~

0x6F can slove high current in sotp mode.

The problem steps are as follows:

1. Enable ADC Function

2. Enter Stop Mode

Here is my experiment:

Source Code	Modify	Current in Stop Mode
Customer’s Software	NONE	High
	change “andcc #0x7f –>#0x6f”	High
	Join Solution provided by NXP	Low
Customer’s Software+ Join Solution provided by NXP	change “andcc #0x6f –>#0x7f”	High