Attiny85 pin 1

Development Boards MicroMod
1

As per ATMEL pin configuration for an attiny85

from pin 1 to 8 are listed as

Chip pin # 1 - PB5

Chip pin # 2 - PB3

Chip pin # 3 - PB4

Chip pin # 4 - GND

Chip pin # 5 - PB0

Chip pin # 6 - PB1

Chip pin # 7 - PB2

Chip pin # 8 - VCC

As per Sparkfun electronics attiny85 Arduino Quick reference sheet,

you can use pin 0 to 4 for general purpose I/O pins

0 = Chip pin # 5

1 = Chip pin # 6

2 = Chip pin # 7

3 = Chip pin # 2

4 = Chip pin # 3

my question is this one, is it possible using the Attiny85 AVR Programmer to have access to chip pin # 1,

and if so how do you access-it

I try the following

pinmode(5,output)

and try to write a value in that port of high or low,

the software upload without any problem, but the chip dye, and nothing happens annymore

Am I using the proper syntax ?

Otherwise what is required in order for me to use this pin # 1 of the Attiny85

I need 1 extra output, could be digital or analog.

Otherwise it seems like I might have to use attiny84 instead.

Thanks

2

In order to use pin PB5, which is the reset pin, you need to program it with specific fuse settings. And because you cannot reset it anymore you need a special high voltage programmer. The ICSP method of programming won’t work. And the regular arduino bootloader neither, for sure. Here is a tutorial/guide that explains more about it:

http://projectsfromtech.blogspot.nl/201 … y8545.html

p.s. maybe there is a clever way to reduce your pin usage and free one up for another use.

3

Valen:
In order to use pin PB5, which is the reset pin, you need to program it with specific fuse settings. And because you cannot reset it anymore you need a special high voltage programmer. The ICSP method of programming won’t work. And the regular arduino bootloader neither, for sure. Here is a tutorial/guide that explains more about it:

http://projectsfromtech.blogspot.nl/201 … y8545.html

p.s. maybe there is a clever way to reduce your pin usage and free one up for another use.

Thank you for the best link :slight_smile: