Cypress FR81S CY91F52 Series Recommendation For Hardware Setup page 28

Recommendation for Hardware Setup 32-Bit FR81S Family
Figure 34. Picture of the MB2100-01-E
Figure 35. Electronic Components needed to protect the Debug I/F pin
(R1 = 43 R, R2 = 10 k, D1 e.g. HZM6.2Z4MFA-E, D2 Schottky diode e.g. BAS40, Debug connector: SMA 50R connector
for development target boards.)
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Document No. 002-09375 Rev. *B 28