CHAPTER 19 IEBus CONTROLLER (V850/SB2)
User’s Manual U13850EJ4V0UM
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(a) Communication error flag (IEERR)...Bit 6
A flag that indicates the detection of an error during communication.
<Set/reset conditions>
Set:
The flag is set if a timing error, parity error (except in the data field), NACK reception (except in
the data field), underrun error, or overrun error (that occurs during broadcasting
communication reception) occurs.
Reset: By software
(b) Start interrupt flag (STARTF)...Bit 5
A flag that indicates whether the interrupt was in the ACK period of the slave address field.
<Set/reset conditions>
Set:
In the slave address field, upon a master request. When IEBus is a slave unit, this flag is set
upon a request from the master (only if it was a slave request in the locked state from the unit
requesting a lock).
Reset: By software
(c) Status transmission flag (STATUSF)...Bit 4
A flag indicating that the transmission status is either the master to slave status, or the lock address
(higher 4 bits, lower 8 bits), when IEBus is a slave unit.
<Set/reset conditions>
Set:
When 0H, 4H, 5H, or 6H is received in the control field from the master when the IEBus is a
slave unit.
Reset: By software
(d) Communication end flag (ENDTRANS)...Bit 3
A flag that indicates whether communication ends after the number of bytes set in the telegraph length
field have been transferred.
<Set/reset conditions>
Set:
When the value of the SCR counter is 0.
Reset: When the MSTRQ, ENSLVTX, or ENSLVRX flag is set.
(e) Frame end flag (ENDFRAM)...Bit 2
A flag that indicates whether communication ends after the maximum number of bytes (32 bytes)
prescribed by mode 1 have been transferred.
<Set/reset conditions>
Set:
When the value of the CCR counter is 0.
Reset: When the MSTRQ, ENSLVTX, or ENSLVRX flag is set.
Содержание MPD703030A
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