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The information presented in this cross reference is based on TOSHIBA's selection criteria and should be treated as a suggestion only. Please carefully review the latest versions of all relevant information on the TOSHIBA products, including without limitation data sheets and validate all operating parameters of the TOSHIBA products to ensure that the suggested TOSHIBA products are truly compatible with your design and application.
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Overall Configuration of the CPU: PSW (Flag)
After executing the instruction, a flag indicates the contents of the memory and the status of the result of a calculation.
PSW (*) collects these flags.
* PSW：Program Status Word
The figure on the right is an example of executing the addition of the A register (00111110) and the B register (11100000).
The calculation result (100011110) is stored in the A register.
However, since the A register can store only 8 bits, the carry flag is set to "1" and the carry flag is left as information that a carry has occurred.
In the A register, (00011110) excluding the most significant digit 1 is stored as the calculation result.
For example, if the calculation result is (100000000), 1 is set in the carry flag, and (00000000) is stored in the A register, so 1 is set in the zero flag.
