S3C84E5/C84E9/P84E9CONTROL REGISTER

IPR — Interrupt Priority Register

FFH

Set 1, Bank 0

Bit Identifier

Reset Value

Read/Write Addressing Mode

.7, .4, and .1

.7

 

.6

.5

.4

.3

 

.2

.1

.0

 

 

 

 

 

 

 

 

 

 

 

 

 

x

 

x

 

x

x

x

x

x

x

R/W

 

R/W

R/W

R/W

R/W

R/W

R/W

R/W

Register addressing mode only

 

 

 

 

 

 

Priority Control Bits for Interrupt Groups A, B, and C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

0

0

 

Group priority undefined

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

0

1

 

B > C > A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

1

0

 

A > B > C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

1

1

 

B > A > C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

0

0

 

C > A > B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

0

1

 

C > B > A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

1

0

 

A > C > B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

1

1

 

Group priority undefined

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

.6

Interrupt Subgroup C Priority Control Bit

0IRQ6 > IRQ7

1IRQ7 > IRQ6

.5

Interrupt Group C Priority Control Bit

0IRQ5 > (IRQ6, IRQ7)

1(IRQ6, IRQ7) > IRQ5

.3

Interrupt Subgroup B Priority Control Bit

0IRQ3 > IRQ4

1IRQ4 > IRQ3

.2

Interrupt Group B Priority Control Bit

0IRQ2 > (IRQ3, IRQ4)

1(IRQ3, IRQ4) > IRQ2

.0

Interrupt Group A Priority Control Bit

0IRQ0 > IRQ1

1IRQ1 > IRQ0

4-11

Page 80
Image 80
Samsung S3C84E5 user manual IPR Interrupt Priority Register, Ffh