80931AA Просмотр технического описания (PDF) - Intel

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производитель

80931AA

UNIVERSAL SERIAL BUS PERIPHERAL CONTROLLERS

Intel 

8x931AA, 8x931HA USB PERIPHERAL CONTROLLER

Signal

Name

RST

SOF#

T1:0

T2

T2EX

TXD

UPWEN#

VCC

VSS

WR#

XTAL1

XTAL2

Table 8. Signal Description (Sheet 3 of 3)

Type

Description

Alternate

Function

I

O

I

I/O

I

O

O

PWR

GND

O

I

O

Reset. Reset input to the chip. Holding this pin high for two

machine cycles while the oscillator is running resets the device.

The port pins are driven to their reset conditions when a voltage

greater than VIH1 is applied, whether or not the oscillator is

running. This pin has an internal pulldown resistor which allows

the device to be reset by connecting a capacitor between this

pin and VCC.

Asserting RST when the chip is in idle mode or powerdown

mode returns the chip to normal operation.

Start of Frame. Start of frame pulse. Active low. Asserted for 8

states when frame timer is locked to USB frame timing and

SOF token or artificial SOF is detected.

Timer 1:0 External Clock Input. When timer 1:0 operates as a

counter, a falling edge on the T1:0 pin increments the count.

Timer 2 Clock Input/Output. For the timer 2 capture mode,

this signal is the external clock input. For the clock-out mode, it

is the timer 2 clock output.

Timer 2 External Input. In timer 2 capture mode, a falling edge

initiates a capture of the timer 2 registers. In auto-reload mode,

a falling edge causes the timer 2 registers to be reloaded. In the

up-down counter mode, this signal determines the count

direction: 1 = up, 0 = down.

Transmit Serial Data. TXD outputs the shift clock in serial I/O

mode 0 and transmits serial data in serial I/O modes 1, 2, and

3.

USB Power Enable. A low signal on this pin applies power to

the external downstream ports.

Supply Voltage. Connect this pin to the +5v supply voltage.

Use a 0.1µf decoupling capacitor for each Vcc pin.

Circuit Ground. Connect this pin to ground.

Write. Write signal output to external memory.

Oscillator Amplifier Input. When implementing the on-chip

oscillator, connect the external crystal or ceramic resonator

across XTAL1 and XTAL2. If an external clock source is used,

connect it to this pin.

Oscillator Amplifier Output. When implementing the on-chip

oscillator, connect the external crystal or ceramic resonator

across XTAL1 and XTAL2. If an external oscillator is used,

leave XTAL2 unconnected.

—

P3.1

P3.5:4/KSO17:16

P1.0

P1.1

P1.7

—

—

—

P3.6/KSO19

—

—

12

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