Z85233 Datasheet, PDF (261/317 Pages) Zilog, Inc. – The Zilog SCC Serial Communication Controller

Application Note
Boost Your System Performance Using The Zilog ESCC^™
AUTOMATIC OPENING FLAG TRANSMISSION (Continued)
End of Frame Flag
Data EOF Data
Data with Special Condition
Data Data* Data
Rx
Data
FIFO
Data
EOF
Data
Packet N
Packet N+1
Receive Character
Available Interrupt
Rx
Data
FIFO
Data*
Data
Special Condition
Interrupt
1. Enable Receive Interrupt on Special Conditions only.
1. Enable Receive Interrupt on Special Conditions only.
2. Receive Data FIFO not locked.
2. Receive Data FIFO locked.
3. Special Condition Interrupt generated.
3. Receive Character Available Interrupt generated
even if it has not been enabled to indicate detection of EOF.
Figure 10. SDLC Status FIFO Anti-Lock
SDLC FIFO Ena
Receive Interr
Special Conditi
6-126
CRC err
Overrr
Error
Pari
Erro
Specia
Conditi
Interru
Data
FIFO
Locke
Erro
Rese
Data
FIFO
Unloc
End o
Frame
Receive Char
Available In
"Reset Hig
IUS" to R
EOF Inter
Figure 11. Receive Interrupt Mechanism 1
UM010901-0601