UPD784938 Datasheet, PDF (508/733 Pages) NEC – 16-Bit Single-Chip Microcontrollers

CHAPTER 20 IEBus CONTROLLER
(2) Master reception
Start bit
t1 T
Communication
starts
Broad-
casting
Master address
P
Slave address
PA
Control
PA
Telegraph
lengh
P
A
Data
PA
T
T
t2
T
AT
AT
PA T
t3
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
(3) Slave transmission
Start bit
t1 T
Communication
starts
Broad-
casting
Master address
P
Slave address
PA
Control
PA
Telegraph
lengh
P
A
Data
PA
T
T
t2
P
T
P
T
PA T
AT
t4
t3
t5
Communication Status
starts
request
Data P A
UT
Data
Data
PA
U
t4
t5
T
End of communication
End of frame
508
Preliminary User’s Manual U13987EJ1V0UM00