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Atmega 162,its pin and IDC(ISP Header)

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electronicsIdiot

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hi to all,

I have problem regarding ATMega162.
I have a trainer board of 8051 and i find that 8051 reset pin is not bubbled
and atmega162 have bubbled one
AT89s52 8051
**broken link removed**
ATMEGA162
**broken link removed**
so i decided to make a seperate board for programming atmega 162.

Do I need to add inverter in the reset path?
and make MOSI MISO SCK connection according to my trainer ISP.

**broken link removed**

and in AVRDUDE what hex values should i give for high low and extended fuses for ATMEGA162?


Please See: I am using linux and compiled cross compilation tool avr-gcc and to program the controller i am using AVRDUDE
 

electronicsIdiot said:
I have a trainer board of 8051 and i find that 8051 reset pin is not bubbled
and atmega162 have bubbled one
Click to expand...
What does "bubbled" mean?

About the attached circuit; In addition I place a 100nF capacitor very close to button pins and another one 1uF close to the MCU pin.

Hope this helps.
 

I am refering "bubbled" as inverted logic see on atmega on reset there is a bubble and in pin diagram there is a bar on reset
for logic 8051 not going to be reset while atmega will reset and for logic 1 it will be inversed.
 

If you mean that reset pin has little circle at it's base, then no. Circle at pin's base means logic inversion of pin, or active low state. In other terms it is denoted ad RESET with line above letters (not sure how to write it in bbcode). This means that device resets when reset is brough low. In case of 8051 reset is not inverted so device resets when RST pin is brough high. This means that you need an inverter. You can make such with single general purpose bipolar transistor (like bc547, bc847, 2n2222, 2n3904 and such) +some resistor in series with base (2k?) + pullup resistor in order of 10k from reset pin to vcc. You may also add 100nF capacitor from reset to gnd to improve noise immunity and prevent accidental resets caused by transients.
 
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