TUSB3210PM datasheet(29/50 Pages) TI1

29 / 50 page

D+

TUSB3210

DM0

DP0

CMOS

CONT-Bit

PUR

1.5 k

Ω

15 k

Ω

15 k

Ω

HUB

D-

TUSB2036A

TUSB3210

www.ti.com

SLLS466G – FEBRUARY 2001 – REVISED DECEMBER 2015

7.5.8 Pullup Resistor Connect and Disconnect

After reading firmware into RAM, the TUSB3210 can re-enumerate using the new firmware (no need to physically

disconnect and reconnect the cable). Figure 4 shows an equivalent circuit implementation for Connect and

Disconnect from a USB upstream port (also see Figure 11b). When the CONT bit in the USBCTL register is 1,

the CMOS driver sources VDD to the pullup resistor (PUR pin) presenting a normal connect condition to the USB

hub (high speed). When the CONT bit is 0, the PUR pin is driven low. In this state, the 1.5-k

Ω resistor is

connected to GND, resulting in device disconnection state. The PUR driver is a CMOS driver that can provide

VDD – 0.1 V minimum at 8 mA of source current.

Figure 4. Pullup Resistor Connect and Disconnect Circuit

7.5.9 8052 Interrupt and Status Registers

All seven 8052-standard interrupt sources are preserved (see Table 8). SIE is the standard interrupt enable

as an OR to generate INT0. The INT0 signal is provided to interrupt the MCU (see interrupt connection diagram,

Figure 5).

Table 8. 8052 Interrupt Location Map

INTERRUPT

START

DESCRIPTION

COMMENTS

SOURCE

ADDRESS

ET2

Timer-2 interrupt

002Bh

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

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