Table C-12. IE Register - SFR A8h
Bit
Function
IE.7
EA - Global interrupt enable. Controls masking of all
interrupts except USB wakeup (resume). EA = 0 disables all
interrupts except USB wakeup. When EA = 1, interrupts are
enabled or masked by their individual enable bits.
IE.6
IE.5
IE.4
IE.3
IE.2
IE.1
IE.0
ES1 - Enable Serial Port 1 interrupt. ES1 = 0 disables Serial
port 1 interrupts (TI_1 and RI_1). ES1 = 1 enables interrupts
generated by the TI_1 or TI_1 flag.
ET2 - Enable Timer 2 interrupt. ET2 = 0 disables Timer 2
interrupt (TF2). ET2=1 enables interrupts generated by the
TF2 or EXF2 flag.
ES0 - Enable Serial Port 0 interrupt. ES0 = 0 disables Serial
Port 0 interrupts (TI_0 and RI_0). ES0=1 enables interrupts
generated by the TI_0 or RI_0 flag.
ET1 - Enable Timer 1 interrupt. ET1 = 0 disables Timer 1
interrupt (TF1). ET1=1 enables interrupts generated by the
TF1 flag.
EX1 - Enable external interrupt 1. EX1 = 0 disables external
interrupt 1 (INT1). EX1=1 enables interrupts generated by
the INT1# pin.
ET0 - Enable Timer 0 interrupt. ET0 = 0 disables Timer 0
interrupt (TF0). ET0=1 enables interrupts generated by the
TF0 flag.
EX0 - Enable external interrupt 0. EX0 = 0 disables external
interrupt 0 (INT0). EX0=1 enables interrupts generated by
the INT0# pin.
C - 28
Appendix C: 8051 Hardware Description
EZ-USB TRM v1.9
CYPRESS [ CYPRESS ]
