8X930AX datasheet(16/38 Pages) INTEL

16 / 38 page

ADVANCE INFORMATION

8x930Ax UNIVERSAL SERIAL BUS (USB) MICROCONTROLLER

5.1

Operating Frequencies

Figure 5. Clock Circuit

Table 8. Frequency Selection and Operating Frequency

PLLSEL2

Pin 43

PLLSEL1

Pin 42

PLLSEL0

Pin 44

USB Rate

(Low

Speed

or Full

Speed)

x930Ax

Internal

Frequency

for CPU

and

Peripherals

CLK)

(5)

XTAL1

External

Frequency

OSC)

Number of

XTAL1

Clocks

OSC)

in One

StateTime

(4)

Comments

1.5 Mbps

(LS)

3 MHz

6 MHz

2 T

OSC/state

PLL Off

1.5 Mbps

(LS)

6 MHz (3)

12 MHz

2 T

OSC/state

PLL Off

12 Mbps

(FS)

12 MHz (3)

12 MHz

1 T

OSC/state

PLL On

NOTES:

Other PLLSEL

x combinations are not valid.

The sampling rate is 4X the USB rate.

The 8

x930Ax CPU and peripherals frequency is 3 MHz (low clock mode) until firmware disables the

low clock mode.

The number of XTAL clocks in one state depends on the PLLSELx selections. When the CPU is oper-

ating at low clock mode (3 MHz), there are four T

OSC per state for the PLLSEL2:1:0 = 100 and 110.

The AC timing specification (Table 11) defines the following symbol: CPU frequency = F

CLK = 1/TCLK.

Clock

Generator

A5135-01

XTAL1

XTAL2

FOSC

(6 or 12 MHz)

PCON.0

(Idle Mode)

IDL

PCON.1

(Powerdown)

÷ 2

PLLSEL

FCLK

CPU

On-chip

Peripherals

Internal Clock

PCON.5

(Low-clock Mode)

3 MHz

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