ModbusIP Atmega168 7,32Mhz

[Edxx-xx]

Hi,

I use the Modbus library with board UNO and was working perfect.
The same program I compile to ATmega168 with clock 7,32Mhz (MiniCore boards) and looks that is stack. The program use 99% of the memory.
The test values are send to outputs of MCP23017 only if I disable line mb.task();

The problem is the memory or clock?

[Edxx-xx]

I change clock to 11.59 and with ATmega 168 no any change - program is stack.
When I replace ATmega168 with ATmega328P and leave clock 11,059 everything is working perfect.