CHAPTER 3 CPU FUNCTION
User’s Manual U12688EJ4V0UM00
102
(2) System status register (SYS)
This register is assigned status flags showing the operating state of the entire system. This register can be
read/written in 8- or 1-bit units.
Address
FFFFF078H
7
0
SYS
6
0
5
0
4
PRERR
3
0
2
0
1
0
0
UNLOCK
After reset
0000000
×
B
Bit Position
Bit Name
Function
4
PRERR
Protection Error Flag
This is a cumulative flag that shows that writing to a specific register was not done in the
correct sequence and that a protection error occurred
Note
.
0: Protection error did not occur
1: Protection error occurred
0
UNLOCK
Unlock Status Flag
This is an exclusive read out flag. It shows that the PLL is in the unlocked state (for
details, refer to 8.4 PLL Lockup).
0: Locked.
1: Unlocked.
Note Operation conditions of PRERR flag
•
Set conditions
(PRERR = “1”)
<1> If the store instruction most recently executed to peripheral I/O does not
write data to the PRCMD register, but to the specific register.
<2> If the first store instruction executed after the write operation to the
PRCMD register is to a peripheral I/O register other than the specific
registers.
•
Reset conditions:
(PRERR = “0”)
<1> When “0” is written to the PRERR flag of the SYS register.
<2> At system reset.
Содержание V850E/MS1 UPD703100
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