S3C825A Datasheet, PDF (78/346 Pages) Samsung semiconductor – 8-BIT CMOS MICROCONTROLLERS

CONTROL REGISTERS
S3C825A/P825A
IPR — Interrupt Priority Register
FFH
Set 1, Bank 0
Bit Identifier
RESET Value
Read/Write
Addressing Mode
.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
.7, .4, and .1
Priority Control Bits for Interrupt Groups A, B, and C ^(note)
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
0 IRQ6 > IRQ7
1 IRQ7 > IRQ6
.5
Interrupt Group C Priority Control Bit
0 IRQ5 > (IRQ6, IRQ7)
1 (IRQ6, IRQ7) > IRQ5
.3
Interrupt Subgroup B Priority Control Bit
0 IRQ3 > IRQ4
1 IRQ4 > IRQ3
.2
Interrupt Group B Priority Control Bit
0 IRQ2 > (IRQ3, IRQ4)
1 (IRQ3, IRQ4) > IRQ2
.0
Interrupt Group A Priority Control Bit
0 IRQ0 > IRQ1
1 IRQ1 > IRQ0
NOTE: Interrupt Group A - IRQ0, IRQ1
Interrupt Group B - IRQ2, IRQ3, IRQ4
Interrupt Group C - IRQ5, IRQ6, IRQ7
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