R5F52108ADFF datasheet(31/92 Pages) RENESAS

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R01DS0041EJ0050 Rev.0.50

Page 31 of 90

Apr 15, 2011

RX210 Group

2. CPU

Under development Preliminary document

Specifications in this document are tentative and subject to change.

2.2.2.4

Processor Status Word (PSW)

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 PSW.PM bit saved on

the stack to 1 or executing an RTFI instruction after having set the BPSW.PM bit to 1.

b31

b30

b29

b28

b27

b26

b25

b24

b23

b22

b21

b20

b19

b18

b17

b16

————

IPL[3:0]

———

——

Value after reset:

00000

0000000

0000

b15

b14

b13

b12

b11

b10

——————

Value after reset:

00000

0000000

0000

Bit

Symbol

Bit Name

Description

R/W

Carry Flag

0: No carry has occurred.

1: A carry has occurred.

R/W

Zero Flag

0: Result is non-zero.

1: Result is 0.

R/W

Sign Flag

0: Result is a positive value or 0.

1: Result is a negative value.

R/W

Overflow Flag

0: No overflow has occurred.

1: An overflow has occurred.

R/W

b15 to b4

—

Reserved

These bits are always read as 0. The write value should be 0.

R/W

b16

I*1

Interrupt Enable

0: Interrupt disabled.

1: Interrupt enabled.

R/W

b17

U*1

Stack Pointer Select

0: Interrupt stack pointer (ISP) is selected.

1: User stack pointer (USP) is selected.

R/W

b19, b18

—

Reserved

These bits are always read as 0. The write value should be 0.

R/W

b20

PM*1,*2,*3

Processor Mode Select

0: Supervisor mode is selected.

1: User mode is selected.

R/W

b23 to b21

—

Reserved

These bits are always read as 0. The write value should be 0.

R/W

b27 to b24

IPL[3:0]*1

Processor Interrupt Priority Level

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)

R/W

b31 to b28

—

Reserved

These bits are always read as 0. The write value should be 0.

R/W

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