Can different microcontrollers communicate with each other? Are there any small chip that can communicate with 89C5131A-UM? And how do I know what frequency does the 89C5131A-UM communicate? I have read the datasheet but could not find it.
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Any microcontroller can communicate with another microcontroller in many different ways.
There are various standard communications protocols for which most micros have at least one or more dedicated peripherals built in such as UART, SPI, I2C, USB, CAN, etc.
For micro to micro the most common is usually SPI, I2C or UART, of which your micro has all three. You need to read up on each to become familiar with the pros and cons (speeds, number of pins taken, complexity, etc) but the datasheet will have all the necessary info, and there are hundreds of tutorials out there (and related questions on here) to help you.
Your mcu features include
So basically it has SPI, I2C and serial communication ability. Almost any mcu you can find will support these three and can be used to communicate between (two or more) devices
The actual used speed depends on the clock source of the mcu and can can be set using the registers related to each peripheral, I'm sure the datasheet explains each one in the relevant section.