The sum value when executing the EPR command or PROGRAM command is the sum value at the time of writing in the first half and the sum value at the second half at the time of verification. However, with the setting of SUM Check Mode, 00 data is filled in the beginning portion, It is output as a fixed value of 32bits.
The calculation method of the sum value is simple addition method ignoring overflow.
The status (SUM = xxxxxxxx) obtained when EPR command is executed with AZ491 or SWX610 has the same format.
Detailed content of sum value at EPR command execution
*1 With the sum check command, only 8 bit data addition 16 bit result calculation method will be supported.
*2 For the sum value of 16-bit data addition, only the buffer memory value is applicable. SUM VERIFY is performed by 8 bit data addition.
*3 In the case of a microcomputer without data read function, the verify is a data retransmission method, so the sum value at verify is the sum value of writer transmit data (buffer memory).
Sum value display example when EPR command is executed
SUM Check Mode 8/8bit （8bit data addition, 8bit SUM result, first 16bit is 0000 data fixed）
SUM Check Mode 8/16bit（8bit data addition, 16bit SUM result）
SUM Check Mode 16/16bit（16bit data addition, 16bit SUM result）
Sum value display example when READ command is executed
SUM Check Mode 8/8bit （8bit data addition , 8bit SUM result, first 24bit is 000000 fixed）
SUM Check Mode 8/16bit （8bit data addition, 16bit SUM result, first 16bit is 0000 fixed）
SUM Check Mode 16/16bit （16bit data addition, 16bit SUM result, first 16bit is 0000 fixed）