UPD784938 Datasheet, PDF (509/733 Pages) NEC – 16-Bit Single-Chip Microcontrollers

CHAPTER 20 IEBus CONTROLLER
Remarks 1. T: timing error, P: parity error, A: ACK error, U: underrun error, : data set interrupt (INTIE1)
2. End of frame occurs at the end of 32-byte data.
Item
Communication starts – timing error
Communication starts – communication start interrupt
Communication start interrupt – status request
Communication start interrupt – end of communication
Status request – end of communication
(IEBus: @ 6-MHz operation)
Symbol
MIN.
Unit
t1
Approx. 97
µs
t2
Approx. 1,380
µs
t3
Approx. 234
µs
t4
Approx. 1,014
µs
t5
Approx. 780
µs
(4) Slave reception
Start bit
t1 T
Communication
starts
Broad-
casting
Master address
P
Slave address
PA
Control
PA
Telegraph
lengh
PA
Data
PA
T
T
t2
P
T
AT
t3
PA T
P
T
t4
P
Communication
starts
Data P A
T
t5
Data
t4
Data
T
PA
End of communication
End of frame
Remarks 1. T: timing error, P: parity error, A: ACK error, : data set interrupt (INTIE1)
2. End of frame occurs at the end of 32-byte data.
Item
Communication starts - timing error
Communication starts - communication start interrupt
Communication start interrupt - ACK error
Communication start interrupt - end of communication
Receive data read interval
(IEBus: @ 6-MHz operation)
Symbol
MIN.
Unit
t1
Approx. 97
µs
t2
Approx. 1,380
µs
t3
Approx. 16
µs
t4
Approx. 1,014
µs
t5
Approx. 390
µs
Preliminary User’s Manual U13987EJ1V0UM00
509