CHAPTER 4 BUS CONTROL FUNCTION
User’s Manual U12688EJ4V0UM00
120
4.8.2 Bus hold procedure
The procedure of the bus hold function is illustrated below.
HLDRQ (Input)
HLDAK (Output)
<1> <2> <3><4><5>
<7><8><9>
<6>
Normal state
Normal state
Bus hold state
<1> HLDRQ = 0 accepted
<2> All bus cycle start request pending
<3> End of current bus cycle
<4> Transition to bus idle state
<5> HLDAK = 0
<6> HLDRQ = 1 accepted
<7> HLDAK = 1
<8> Clears bus cycle start request pending
<9> Start of bus cycle
4.8.3 Operation in power save mode
In the STOP or IDLE mode, the internal system clock is stopped. Consequently, the bus hold state is not accepted
and set even if the HLDRQ pin becomes active.
In the HALT mode, the HLDAK pin immediately becomes active when the HLDRQ pin becomes active, and the bus
hold state is set. When the HLDRQ pin becomes inactive, the HLDAK pin becomes inactive. As a result, the bus hold
state is cleared, and the HALT mode is set again.
Содержание V850E/MS1 UPD703100
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