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CONTROL REGISTERS S3C84E5/C84E9/P84E9
4-32
SYM — System Mode Register DEH Set 1
Bit Identifier .7 .6 .5 .4 .3 .2 .1 .0
Reset Value 0 0 0 x x x 0 0
Read/Write – – – R/W R/W R/W R/W R/W
Addressing Mode Register addressing mode only
.7–.5 Not used, But you must keep always 0
.4–.2 Fast Interrupt Level Selection Bits
0 0 0 IRQ0
0 0 1 IRQ1
0 1 0 IRG2
0 1 1 IRQ3
1 0 0 IRQ4
1 0 1 IRQ5
1 1 0 IRQ6
1 1 1 IRQ7
.1 Fast Interrupt Enable Bit
0 Disable fast interrupt processing
1 Enable fast interrupt processing
.0
Global Interrupt Enable Bit
(note)
0 Disable global interrupt processing
1 Enable global interrupt processing
NOTE: Following a reset, you enable global interrupt processing by executing an EI instruction (not by writing a "1" to
SYM.0).