Processor Status Word (Psw) - Renesas RX100 Series User Manual

RX13T Group
2.2.2.4

Processor Status Word (PSW)

b31 b30
— —
Value after reset: 0 0
b15 b14
— —
Value after reset: 0 0
Bit Symbol
b0 C
b1 Z
b2 S
b3 O
b15 to b4 —
1
b16 I*
1
b17 U*
b19, b18 —
1, 2, 3
b20 PM* * *
b23 to b21 —
1
b27 to b24 IPL[3:0]*
b31 to b28 —
Note 1. In user mode, writing to the IPL[3:0], PM, U, and I bits by an MVTC or a POPC instruction is ignored.
Writing to the IPL[3:0] bits by an MVTIPL instruction generates a privileged instruction exception.
Note 2. In supervisor mode, writing to the PM bit by an MVTC or a POPC instruction is ignored, but writing to the other bits is possible.
Note 3. Switching from supervisor mode to user mode requires execution of an RTE instruction after having set the
on the stack to 1 or executing an RTFI instruction after having set the
R01UH0822EJ0100 Rev.1.00
Jul 31, 2019
b29 b28 b27 b26
— — IPL[3:0]
0 0 0 0
b13 b12 b11 b10
— — — —
0 0 0 0
Bit Name
Carry Flag
Zero Flag
Sign Flag
Overflow Flag
Reserved
Interrupt Enable
Stack Pointer Select
Reserved
Processor Mode Select
Reserved
Processor Interrupt Priority Level
Reserved
b25 b24 b23 b22
— —
0 0 0 0
b9 b8 b7 b6
— — — —
0 0 0 0
Description
0: No carry has occurred.
1: A carry has occurred.
0: Result is not 0.
1: Result is 0.
0: Result is a positive value or 0.
1: Result is a negative value.
0: No overflow has occurred.
1: An overflow has occurred.
These bits are read as 0. The write value should be 0.
0: Interrupt disabled.
1: Interrupt enabled.
0: Interrupt stack pointer (ISP) is selected.
1: User stack pointer (USP) is selected.
These bits are read as 0. The write value should be 0.
0: Supervisor mode is selected.
1: User mode is selected.
These bits are read as 0. The write value should be 0.
b27 b24
0 0 0 0: Priority level 0 (lowest)
0 0 0 1: Priority level 1
0 0 1 0: Priority level 2
0 0 1 1: Priority level 3
0 1 0 0: Priority level 4
0 1 0 1: Priority level 5
0 1 1 0: Priority level 6
0 1 1 1: Priority level 7
1 0 0 0: Priority level 8
1 0 0 1: Priority level 9
1 0 1 0: Priority level 10
1 0 1 1: Priority level 11
1 1 0 0: Priority level 12
1 1 0 1: Priority level 13
1 1 1 0: Priority level 14
1 1 1 1: Priority level 15 (highest)
These bits are read as 0. The write value should be 0.
BPSW.PM bit
b21 b20 b19 b18
— PM — —
0 0 0 0
b5 b4 b3 b2
— — O S
0 0 0 0
PSW.PM bit
to 1.
Page 48 of 1041
2. CPU
b17 b16
U I
0 0
b1 b0
Z C
0 0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
saved