TUSB3210PM datasheet(30/44 Pages) TI

30 / 44 page

2–18

2.8

Pullup Resistor Connect/Disconnect

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

disconnect and re-connect the cable). Figure 2–4 shows an equivalent circuit implementation for Connect and

Disconnect from a USB up-stream port (also see Firgure 4–4b). When CONT bit in 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 CONT bit is 0, 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) volt minimum at 8 mA

source current.

D+

TUSB3210

DM0

DP0

CMOS

CONT-Bit

PUR

1.5 k

Ω

15 k

Ω

15 k

Ω

HUB

D–

TUSB2036A

Figure 2–4. Pullup Resistor Connect/Disconnect Circuit

2.9

8052 Interrupt and Status Registers

All 8052 standard 5 interrupt sources are preserved. SIE is the standard interrupt enable register, which controls the

five interrupt sources. All the additional interrupt sources are connected together as an OR to generate EX0. XINTO#

signal is provided to interrupt an external MCU (see Interrupt connection diagram, Figure 2–5).

Table 2–7. 8052 Interrupt Location Map

INTERRUPT

SOURCE

DESCRIPTION

START

ADDRESS

COMMENTS

UART interrupt

0023H

ET1

Timer–1 interrupt

001BH

EX1

Internal INT1

0013H

Used for P2[7:0] interrupt

ET0

Timer–0 interrupt

000BH

EX0

Internal INT0

0003H

Used for all internal peripherals

Reset

0000H

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