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V850E/MA2 Datasheet(PDF) 23 Page - NEC |
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V850E/MA2 Datasheet(HTML) 23 Page - NEC |
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23 / 226 page  CHAPTER 2 REGISTER SET User’s Manual U14559EJ3V1UM 23 2.2.5 CALLT caller status saving registers (CTPC, CTPSW) Two CALLT caller status saving registers are provided: CTPC and CTPSW. If a CALLT instruction is executed, the contents of the program counter (PC) are saved to CTPC, and the contents of the program status word (PSW) are saved to CTPSW. The contents saved to CTPC are the address of the instruction next to the CALLT instruction. The current value of the PSW is saved to CTPSW. Bits 31 to 26 of CTPC and bits 31 to 12 and 10 to 8 of CTPSW are reserved for future function expansion (fixed to 0). Figure 2-7. CALLT Caller Status Saving Registers (CTPC, CTPSW) 31 26 25 0 CTPC (Contents of PC) 31 0 CTPSW (Contents of PSW) 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 8 11 0 0 Note 9 10 12 Initial value 0xxxxxxxH (x: Undefined) 00000xxxH 0 Initial value (x: Undefined) 7 Note Contents of SS flag in PSW |
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