Datasheet

18-28 MCF5407 User’s Manual
General Operation of External Master Transfers
Figure 18-29. MCF5407 Two-Wire Bus Arbitration Protocol State Diagram
Table 18-10 describes the two-wire bus arbitration protocol transition conditions.
Table 18-10. MCF5407 Two-Wire Bus Arbitration Protocol Transition Conditions
Present
State
Condition
Label
RSTI
Software Watchdog
Reset
BG
Bus
Request
Transfer in
Progress
End of
Cycle
1
Next
State
Reset
A1
A
2
— — — — — Reset
A2
N
3
A — — — — Reset
A3NNN———
EM
4
A4 N N A — — — Implicit mas
Implicit
Master
B1NNN———EM
B2 N N A — — — Explicit mas
B3 N N A N — — Implicit mas
B4 N N A A — — Explicit mas
Explicit
Master
C1 N N A — — — Explicit mas
C2 N N N — — — Explicit mas
C3NNN—N—EM
C4 N N N — A N Explicit mas
C5 N N N — A A EM
External
Master
D1 N N N — — — EM mas
D2 N N A — —
—
Explicit mas
D3 N N A N — — Implicit mas
D4 N N A A — — Explicit mas
Reset
Implicit
Master
Explicit
Master
External
A1
A2
A3
A4
C3
C1
C2
C5
C4
B2
B1
B4
D2
D4
D3
B3
D1
Master