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What is the basis for pull up resistance value of TOOL0 pin of E1 or E20 ?

Latest Updated:09/29/2014

Question:

"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?

Answer:

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.
Suitable Products
RL78 Family
CS+ (formerly CubeSuite+)
E1 [R0E000010KCE00]
E20 [R0E000200KCT00]