
400
CHAPTER 17
IEBus CONTROLLER (
PD178096A, 178098A, 178F098 ONLY)
User’s Manual U12790EJ2V0UD
Figure 17-24. Format of IEBus Interrupt Status Register (ISR)
Caution Each of IEERR, STARTF, STATUSF, ENDTRNS, and ENDFRAM are generation triggers for the
interrupt request signal (INTIE2) (see Figure 17-28 Configuration of Interrupt Control Block).
Because of this, if any one of these interrupt triggers has been set, no new interrupt will be
generated by a subsequent trigger. Clear the flag of the interrupt source by the interrupt
servicing program before the next interrupt occurs.
0
No communication error
Communication error
IEERR
0
1
Communication error flag (during communication)
ISR
IEERR
STARTF STATUSF ENDTRNS ENDFRAM
00
Start interrupt does not occur
Start interrupt occurs
STARTF
0
1
Start interrupt flag
Status transmission flag (slave)
After reset: 00H
R/W
Address: FFBCH
No slave status/lock address (higher 4 bits, lower 8 bits) transmission
request
Slave status/lock address (higher 4 bits, lower 8 bits) transmission request
STATUSF
0
1
Communication end flag
Communication does not end after the number of bytes set in the
telegraph length field have been transferred
Communication ends after the number of bytes set in the telegraph length
field have been transferred
ENDTRNS
0
1
Frame end flag
The frame (transfer of the maximum number of bytes (32 bytes)
prescribed by mode 1) did not end
The frame (transfer of the maximum number of bytes (32 bytes)
prescribed by mode 1) ended
ENDFRAM
0
1
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