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CONTROL REGISTERS
SYM
— System Mode Register
Bit Identifier
Reset Value
Read/Write
Addressing Mode
.7
.6–.5
.4–.2
.1
.0
NOTES:
1.
You can select only one interrupt level at a time for fast interrupt processing.
2.
Setting SYM.1 to "1" enables fast interrupt processing for the interrupt level currently selected by SYM.2–SYM.4.
3.
Following a reset, you must enable global interrupt processing by executing an EI instruction
(not by writing a "1" to SYM.0).
4-44
.7
.6
0
–
R/W
–
Register addressing mode only
This bit must remain logic "0"
Not used for the S3C8275X/C8278X/C8274X
Fast Interrupt Level Selection Bits
0
0
0
IRQ0
0
0
1
IRQ1
0
1
0
IRQ2
0
1
1
IRQ3
1
0
0
IRQ4
1
0
1
IRQ5
1
1
0
IRQ6
1
1
1
IRQ7
Fast Interrupt Enable Bit
0
Disable fast interrupt processing
1
Enable fast interrupt processing
Global Interrupt Enable Bit
0
Disable all interrupt processing
1
Enable all interrupt processing
S3C8275X/F8275X/C8278X/F8278X/C8274X/F8274X
.5
.4
.3
–
x
x
–
R/W
R/W
(1)
(2)
(3)
DEH
.2
.1
x
0
R/W
R/W
Set 1
.0
0
R/W
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