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Serial 1 --- 1 if interrupt pending0
Serial 2 --- 1 if interrupt pending1
Serial 3 --- 1 if interrupt pending2
Serial 4 --- 1 if interrupt pending3
0 (not used)4
0 (not used)5
0 (not used)6
0 (not used)7 (MSB)
Figure 9 --- Interrupt Status Register contents
2-6 Quatech Inc.