Fujitsu F2MCTM-16LX Hardware Manual page 80

CHAPTER 3 INTERRUPTS
[bit 13, bit 12, bits 5, bit 4] S0 and S1 (extended intelligent I/O service status)
S0 and S1 are read-only bits. The values set in these bits indicate the end condition of EI
are initialized to '00' upon a reset.
Table 3.3-3 shows the relationship between the S bits and the end conditions.
Table 3.3-3 S Bits and End Conditions
S1
0
0
1
1
64
S0
2
0
EI OS running or not activated
1 Stop status by count end
0 Reserved
1 Stop status by request from internal resource
End conditions
2
OS. These bits