RM48L952: Role of nERROR port on the RM48L952

Hello Sone,

Hercules MCUs have a ESM module (Error Signaling Module) which collects and reports the various error conditions on the microcontroller. The error condition is categorized based on a severity level. Error response is then generated based on the category of the error.

This device has 128 error channels that are divided into 3 different groups:

• 64 Group1 (low severity) channels with configurable interrupt generation and configurable ERROR pin behavior32
• Group2 (high severity) channels with predefined interrupt generation and predefined ERROR pin behavior32
• Group3 (high severity) channels with no interrupt generation and predefined ERROR pin behavior.

The ESM channel assignments are listed in RM48 datasheet (Table 6-35)

The ESM interrupt and ERROR pin behavior are also summarized in the following table (in TRM):

Once an error occurs, the ESM module will set the corresponding error flags (ESM status registers). In addition, it can trigger an interrupt, ERROR pin outputs low depending on the ESM settings.

Once the ERROR pin outputs low, a power on reset or a write of 0x5 to ESMEKR is required to release the ESM error pin back to normal state.