Echelon FT 3150 Smart Transceiver - Manual (Page 59)

FT 3120 / FT 3150 Smart Transceiver Data Book 53
Parallel I/O Objects
Handshaking
Handshaking allows the master to monitor the slave between every byte transfer, ensuring that both processors are
ready for the byte to be transferred. If the master owns the token, the master waits for the HS from the slave before
writing data to the bus. If the slave owns the token, the master monitors the low transition of the HS before reading
the bus. In master or slave A mode, the FT Smart Transceiver HS line is pin IO10. In slave B mode, the FT Smart
Transceiver HS bit is monitored on IO0 which corresponds to the least significant data bit of the status register.