Datasheet

2−20
D+
TUSB2136
DM0
DP0
CMOS
CONT-BitPUR
1.5 kΩ
15 kΩ15 kΩ
HUB
D−
TUSB2046B
Figure 2−3. Pullup Resistor Connect/Disconnect Circuit
2.9 8052 Interrupt and Status Registers
All seven 8052-standard interrupt sources are preserved. SIE is the standard interrupt enable register, which controls
the seven interrupt sources. All the additional interrupt sources are connected together as an OR to generate INT0
.
The INT0
signal is provided to interrupt the MCU (see interrupt connection diagram, Figure 2−4).
Table 2−7. 8052 Interrupt Location Map
INTERRUPT
SOURCE
DESCRIPTION START
ADDRESS
COMMENTS
ET2 Timer-2 interrupt 002BH
ES 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
EX0 Internal INT0 0003H Used for all internal peripherals
Reset 0000H