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Chapter 3
CPU Functions
User’s Manual U16580EE3V1UD00
Table 3-3:
Saturated Operation Results
(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.
Bits 31 to 26 CTPC and bits 31 to 8 of CTPSW are reserved (fixed to 0) for future function
expansion.
Figure 3-7:
CALLT Execution Status Saving Registers (CTPC, CTPSW)
The values of CTPC and CTPSW are restored to PC and PSW during execution of the CTRET
instruction.
Operation result status
Flag status
Saturated
operation result
SAT
OV
S
Maximum positive value exceeded
1
1
0
7FFFFFFFH
Maximum negative value exceeded
1
1
1
80000000H
Positive (maximum value not exceeded)
Holds value
before operation
0
0
Actual
operation result
Negative (maximum value not exceeded)
1
31
26 25
0
After reset
0xxxxxxxH
(x: Undefined)
CTPC
0 0 0 0 0 0
(PC contents)
31
8 7
0
After reset
000000xxH
(x: Undefined)
CTPSW
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
(PSW contents)
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