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UPD70F3114 Datasheet(PDF) 53 Page - NEC |
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UPD70F3114 Datasheet(HTML) 53 Page - NEC |
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53 / 692 page  CHAPTER 3 CPU FUNCTION 53 User’s Manual U15195EJ5V0UD (2/2) Note During saturated operation, the saturated operation results are determined by the contents of the OV flag and S flag. The SAT flag is set (to 1) only when the OV flag is set (to 1) during saturated operation. Flag status Operation result status SAT OV S Saturated operation result Maximum positive value exceeded 1 1 0 7FFFFFFFH Maximum negative value exceeded 1 1 1 80000000H Positive (maximum value not exceeded) 0 Negative (maximum value not exceeded) Holds value before operation 0 1 Actual operation result (5) CALLT execution status saving registers (CTPC, CTPSW) There are two CALLT execution status saving registers, CTPC and CTPSW. When the CALLT instruction is executed, the contents of the program counter (PC) are saved to CTPC, and the program status word (PSW) contents are saved to CTPSW. The contents saved to CTPC consist of the address of the next instruction after the CALLT instruction. The current PSW contents are saved to CTPSW. Bits 31 to 26 of CTPC and bits 31 to 8 of CTPSW are reserved (fixed to 0) for future function expansion. 31 0 CTPC (PC contents saved) 0 0 After reset 0xxxxxxxH (x: Undefined) 26 25 0 0 0 0 31 0 CTPSW (PSW contents saved) 0 0 After reset 000000xxH (x: Undefined) 8 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 7 |
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