V850E1 Datasheet, PDF (23/226 Pages) NEC – 32-Bit Microprocessor Core

CHAPTER 2 REGISTER SET
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 0 0 0 0 0 0
(Contents of PC)
Initial value
0xxxxxxxH
(x: Undefined)
31
12 11 10 9 8 7
0
CTPSW 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Note 0 0 0
(Contents of PSW)
Initial value
00000xxxH
(x: Undefined)
Note Contents of SS flag in PSW
User’s Manual U14559EJ3V1UM
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