TUSB3210_1 datasheet(30/45 Pages) TI

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WDT Reset

WDE

PURS

USBCTL Register

MCNFG Register

USB Function Reset

FRSTE

RESET

MCU

All Internal MMR

RST

USBR

2.8

Pullup Resistor Connect/Disconnect

D+

TUSB3210

DM0

DP0

CMOS

CONT-Bit

PUR

1.5 k

Ω

15 k

Ω

15 k

Ω

HUB

D-

TUSB2036A

2.9

8052 Interrupt and Status Registers

TUSB3210

Universal Serial Bus

General-Purpose Device Controller

SLLS466F – FEBRUARY 2001 – REVISED AUGUST 2007

Figure 2-2. Reset Diagram

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 2-3 shows an equivalent circuit implementation for

Connect and Disconnect from a USB upstream port (also see Figure 4-3b). 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 2-3. Pullup Resistor Connect/Disconnect Circuit

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

DESCRIPTION

START

COMMENTS

SOURCE

ADDRESS

ET2

Timer-2 interrupt

002Bh

Functional Description

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