SAP5SD-B-G1-R datasheet(46/67 Pages) RENESAS

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SAP51 / SAP5S Datasheet

January 28, 2016

5.17. Communication Monitor/Watchdog

The SAP5 contains an independent Communication Monitor that observes the processing of Data_Exchange

(DEXG) and Write_Parameter (WPAR) requests. If no such requests have been processed for more than 94.2ms

(+4ms) the Communication Monitor recognizes a No Data/Parameter Exchange status and turns the red status

LED (i.e., LED2) on. Any subsequent Data_Exchange or Write_Parameter request will allow the Communication

Monitor to start over and will turn the red status LED off.

The Communication Monitor is only activated for a slave addresses not equal to zero (0HEX) and while the SAP5 is

processing the first Write_Parameter request after initialization. It becomes deactivated at any SAP5 reset or after

the reception of a Delete_Address request.

Activation of the Communication Watchdog depends on several EEPROM flags and the Parameter Port P0 output

Note: The value of the Parameter Port P0 input does not have any influence on the Communication Watchdog

activation. Only the master can change the activation status by sending a corresponding Write_Parameter

(WPAR) request. This allows using the feature even if IO_Code = 7 is selected. In this case, the Parameter Port

pins are mapped into Data Input pins. However, since the activation of the Communication Watchdog only

depends on the value of the parameter output register, the watchdog functionality still remains controlled by the

master.

Watchdog activation through the value of the Parameter Port P0 is not available in Safety Mode.

Table 5.22 Activation of the SAP5 Communication Watchdog

Lock_EE_PRG

EEPROM flag

Inhibit_Watchdog

EEPROM flag

P0_Watchdog_Activation

EEPROM flag

Safety_Mode_

Enable

Parameter

Port P0 Output

Watchdog

Activation

OFF

The Communication Watchdog recognizes a No Data Exchange status if all of the following conditions are true:

•

The Communication Watchdog is activated.

•

No DEXG or WPAR request has been processed for more than 94.2ms (+4ms).

•

Slave address is not equal to zero (0HEX).

•

No EEPROM write access is active.

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