PD72042B_15 Datasheet, PDF (75/92 Pages) Renesas Technology Corp – LSI DEVICE FOR Inter Equipment BusTM (IEBusTM) PROTOCOL CONTROL

µPD72042B
6.4.3 Command Processing Routine
This routine is executed when CORQ has been set by the application processing routine.
The command processing routine sets a command code, in the CMR register, to set the lock state, control
transmission/reception buffers, control communication, and set optional functions.
The commands for master communication and slave data transmission request are described in Sections 6.4.4
and 6.4.5.
Fig. 6-5 shows the flow of the command processing routine.
Fig. 6-5 Command Processing Routine
Start
Read FLG
1
CEX?
0
CMR ← Command code
; Waiting for termination
of previous command?
End
6.4.4 Master Communication Processing Routine
This routine is executed when MCRQ has been set by the application processing routine.
The master communication processing routine consists of the following three processing routines:
• Master transmission processing routine 1
This routine is used to transmit data, as the master unit, starting from the first data in TBF.
• Master transmission processing routine 2
This routine is used to start master transmission from the point at which the previous master transmission was
suspended.
• Master reception processing routine
This routine is used to receive data, as the master unit, from a slave unit.
Data Sheet S13990EJ3V0DS
73