"1 kΩ" is recommended for the pull-up resistance value of the TOOL0 pin of the E1 or E20 emulator and the RL78 family microcontroller. What is the basis for this constant?
The E1 or E20 emulator and the microcontroller perform UART communication with a communication speed of 1 Mbps at the TOOL0 pin line, but this line is an N-ch open drain. Therefore, the calculated value for ensuring a sufficient high level is 1 kΩ.
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