mega168PA vs 168PB

andro · Joined: 12 Mar 2007 Posts: 94 Location: Ljubljana

Hello!

Migrating from mega8 to mega168pb I encoutered some strange behavior.
After a power-on reset MCU is not able to init the HTRC110 hitag IC properly - the read range is zerro. If I do a HW reset, MCU resets and now, HTRC110 IC isbeing configured right - read range is now 4 to 6 cm, as expected.

I use m168pdef.dat Is that ok for a 168PB MCU ? I took a look at both datasheets, and I'am not sure, what is the differece between them.

albertsm · Joined: 09 Apr 2004 Posts: 5921 Location: Holland

attached the PB dat file. but other than some new regs for some new hardware, i see no problem.
but that said : notice the VCC and GND pad changes between m168P and PB for the new hardware!

andro · Joined: 12 Mar 2007 Posts: 94 Location: Ljubljana

Hi Marc!

Thanks for Your ultra-quick respons. Yesterday I started to compare existing p.dat and pb datasheet... But more concerning is vcc/gnd pinout comment, that You gave to me... That's something I did not check yet. I'll report whether it is .dat or the pinout problem.

BR
Andrej

Evert :-) · Joined: 18 Feb 2005 Posts: 2156

AT06609: Differences between ATmega48/88/168 Variants and the New ATmega48/88/168PB
Not much special changed.

andro · Joined: 12 Mar 2007 Posts: 94 Location: Ljubljana

Hi!

Thanks for the link, Evert. I was able to find this link yesterday http://www.atmel.com/Images/doc8196.pdf, but the one, You sent today is what I was looking for.
Those additional PE0 and PE1 are now tight to Vcc and GND (I did the layout on mega8 pinout base) , but I think, this may not cause any problems.

BR
Andrej

hgrueneis · Joined: 04 Apr 2009 Posts: 902 Location: A-4786 Brunnenthal

Not much changed?????

Take a look at the "Alternate Functions of Port E" on page 122 of the full Datasheet!

Pins 3, 6, 19 and 22 changed and or added many functions.

PE3 ADC7, T3, MOSI1, PCINT27
PE2 ADC6, ICP3, SS1, PCINT26
PE1 T4, SCL1, PCINT25
PE0 ACO, ICP4, SDA1, PCINT24

Also see overriding signals on Page 123 with a Master/Slave select SPI

Have fun
Hubert

hgrueneis · Joined: 04 Apr 2009 Posts: 902 Location: A-4786 Brunnenthal

I use the Atmega168 (AU and PU versions) a lot in my projects.

@Mark Alberts,
the alternate functions of port E bits 0-3 seem to be not implemented in the new m168PBdef.dat.
Looking through the file, I could not find any other than Port, Pin and DDR definitions.
There should be the PCINT's, SPI1, Master/Slave select, TWI1, counter inputs T3, T4, ACO, ......
For example PCINT stops at 23.
There is on Port E 24 to 27.
Did I just not find it because of differing names, or will it be added at a later time?
It is a significant improvement of the chip and adds functions to otherwise useless pins.
Currently it seems that we can only use Port E as general I/O.
It also sometimes would allow the use of the 168PB chip instead of a larger and more expensive one.
Please correct me if I am wrong.
Thanks
Hubert

Evert :-) · Joined: 18 Feb 2005 Posts: 2156

jure_m · Joined: 14 Jan 2005 Posts: 68 Location: Ljubljana

Hi,

does any of you have updated/new DEF file for Mega168PB? This chip does have a bunch of new features that Mega168 does not have.

Best regards
Jure

albertsm · Joined: 09 Apr 2004 Posts: 5921 Location: Holland

attached the official dat file.