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2.9.1

8052 Standard Interrupt Enable Register

2.9.2

Additional Interrupt Sources

TUSB3210

Universal Serial Bus

General-Purpose Device Controller

SLLS466F – FEBRUARY 2001 – REVISED AUGUST 2007

Table 2-7. 8052 Interrupt Location Map (continued)

INTERRUPT

DESCRIPTION

START

COMMENTS

SOURCE

ADDRESS

UART interrupt

0023h

ET1

Timer-1 interrupt

001Bh

EX1

Internal INT1 or INT1

0013h

Used for P2[7:0] interrupt

ET0

Timer-0 interrupt

000Bh

INT0

Internal INT0

0003h

Used for all internal peripherals

Reset

0000h

RSV

ET2

ET1

EX1

ET0

INT0

R/W

R/O

R/W

BIT

NAME

RESET

FUNCTION

INT0

Enable or disable interrupt-0

INT0 = 0

Interrupt-0 is disabled.

INT0 = 1

Interrupt-0 is enabled.

ET0

Enable or disable timer-0 interrupt

ET0 = 0

Timer-0 interrupt is disabled.

ET0 = 1

Timer-0 interrupt is enabled.

EX1

Enable or disable interrupt-1

EX1 = 0

Interrupt-1 is disabled.

EX1 = 1

Interrupt-1 is enabled.

ET1

Enable or disable timer-1 interrupt

ET1 = 0

Timer-1 interrupt is disabled.

ET1 = 1

Timer-1 interrupt is enabled.

Enable or disable serial port interrupts

ES = 0

Serial port interrupt is disabled.

ES = 1

Serial port interrupt is enabled.

ET2

Enable or disable timer-2 interrupt

ET1 = 0

Timer-2 interrupt is disabled.

ET1 = 1

Timer-2 interrupt is enabled.

RSV

Reserved

Enable or disable all interrupts (global disable)

EA = 0

Disable all interrupts.

EA = 1

Each interrupt source is individually controlled.

All nonstandard 8052 interrupts (USB, I2C, etc.) are connected as an OR to generate an internal INT0. It

must be noted that the external INT0 and INT1 are not used. Furthermore, INT0 must be programmed as

an active-low level interrupt (not edge-triggered). A vector interrupt register is provided to identify all

interrupt sources (see vector interrupt register definition, Section 2.9.3). Up to 64 interrupt vectors are

provided. It is the responsibility of the MCU to read the vector and dispatch the proper interrupt routine.

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