32186 datasheet(111/1032 Pages) RENESAS

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EIT

4-9

32185/32186 Group Hardware Manual

Rev.1.10 REJ09B0235-0110 May 15, 07

4.6 Saving and Restoring PC and PSW

PSW

BPC

When EIT is accepted

When RTE instruction

is executed

[1] Saving the SM, IE and C bits

BSM

BIE

←

[2] Updating the SM, IE and C bits

Unchanged or 0

←

[3] Saving the PC

BPC

←

[4] Setting the vector address in the PC

Vector address

←

[B] Restoring the PC from the BPC register

The value stored in the BPC register

after executing the RTE instruction is

undefined.

[A] Restoring the SM, IE and C bits from the

backup field

The values stored in the BSM, BIE

and BC bits after executing the RTE

instruction are undefined.

BSM

BIE

←

[1]

[A]

[B]

[2]

[3]

[4]

Figure 4.6.1 Saving and Restoring the PC and PSW

16 17

23 24 25

31(LSB)

0(MSB)

BSM

BIE

PSW

BPSW field

PSW field

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