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R01UH0336EJ0102 Rev.1.02
Page 351 of 1538
Jul 17, 2014
V850E2/PG4-L
Section 10 Safety Guardian (SGA)
The SGA is divided into the indirect safety guardian (ISG) and direct safety
guardian (DSG).
• ISG is used for static configuration of the error sources.
• DSG consists of combinatorial logic only. Therefore, it is robust against
clock faults and able to indicate an error towards SGATERROUTZ even in
case of clock faults.
The SGA has the following external connections.
• Inputs
– Error inputs SGATERRINxx from all internal error sources and monitoring
units. The SGA master and SGA checker have identical error input
signals.
– The SGATTIN timer input connection is for generating dynamic error
operation.
– Error loop-back SGATERRLB is used to read back the error output level
from the ERROROUT pin of the device.
• Outputs
– Interrupt output SGATI
– Internal reset output SGARES
– Error output SGATERROUTZ