SAP51D-B-G1-R datasheet(33/67 Pages) RENESAS

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SAP51 / SAP5S Datasheet

January 28, 2016

In addition to the standard input function, the Data Port has data pre-processing features that can be activated by

setting corresponding flags in the Firmware Area of the EEPROM.

• Input Inverting: The input values of all four data input channels are inverted if the Invert_Data_In flag is ‘1’

• Input Delay: If the Delay Mode is activated, a new input value is returned to the master if equal input data

was sampled for two consecutive Data_Exchange cycles. As long as the condition is not true, previous

valid data is returned. To suppress undesired input data validation in the event of immediately repeated

Data_Exchange calls (i.e., AS-i masters immediately repeat a Data_Exchange request if no valid slave

response was received on the first request), input data sampling is blocked for 256µs (-6.25%) after every

sampling event.

The filter output of each data port is preset to “0” after reset or as long as the Data_Exchange_Disable flag is set.

Figure 5.4

Principles of Delay Mode Input Filtering – Example for Slave with Address 1HEX

> 256µs (-6.25 %)

DEXG Addr 1

DEXCHG Addr 1

DEXG Addr 1

Slave

Input

Signal

Filter

Output

Sampling Point

< 256µs (-6.25 %)

This sampling event is

blocked to avoid immediate

input data validation

Activation of Delay Mode depends on the EEPROM flags Delay_Mode and P1_Delay_Activation and the value of

the Parameter Port P1 Output Register as shown in Table 5.11. Delay Mode cannot be activated when Safety

Mode is enabled.

Note: The input signal at Parameter Port P1 does not affect activation of Input Delay Mode. Only the master can

change the activation status by sending a corresponding Write_Parameter (WPAR) request.

Table 5.11 Activation of Delay Mode

Delay_Mode

P1_Delay_Activation

Parameter P1 Output Register

Delay Mode

OFF

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