USART2 setting for 1MHzCPU + 4PLL

[longpole001]

Then why do you need to run at 1MHz? You can achieve an average current consumption of <0.4mA by running the clock at 64MHz (according to data in your post) - far less than the 1.04mA that you are hoping to achieve.

values are clear but how the sleep function is used is not clear in the posts


if i run the cpu at 1mhz my current usage while on and standing by waiting to do its function are 1.04ma
if i run the cpu at 64mhz my current usage while on and standing by waiting to do its function are 10.35ma


in sleep mode ( waiting for power on button) it is 0.24ma no mater what

[rmteo]

You are not using the features of the MCU correctly. Sleep current of the PIC18F46K80 is anything from 200nA (0.0002mA) to 10uA (0.01mA) depending on temperature and VDD (according to to the data sheet) and not the 0.24mA that you quoted.


Run current at 64MHz is 7-12mA.


So, worst case, your average current will be <0.2mA even running the core at 64MHz. Here'e how:

Active - running @ 64MHz = 12mA * 1/64 = 0.1875mA
Sleeping = 0.01mA * 63/64 = 0.00984375mA
Average = 0.1875 + 0.00984375 = 0.19734375 = < 0.2mA, less than 20% of what you are hoping to achieve at 1MHz.