2

ICS9131

Pin Descriptions

Functionality

FS2

FS1

FS0

CPUCLK

ACTUALS

0

0

0

0

1

1

1

1

0

0

1

1

0

0

1

1

0

1

0

1

0

1

0

1

16

25

33.3

40

50

60

66.6

80

16.004

25.059

33.412

40.095

50.119

60.142

66.484

80.190

PIN NUMBER

PIN NAME

TYPE

DESCRIPTION

1

32 kHz

Output

32.768 kHz output.

2

X2

Output

Connect 32 kHz crystal, this input includes internal load

capacitor for crystal.

3

X1

Input

Connect 32 kHz crystal, this input includes internal load

capacitor for crystal.

4

VDD32

--

Power Supply for 32 kHz oscillator.

5

VCC

--

Power Supply.

6

VSS

--

Ground.

7

AGND

--

Analog Ground.

8

OE

Input

OE tristates outputs when low.

9

FS2

Input

CPU clock frequency select 2.

10

REFCLK

Output

14.318 MHz output.

11

STOPCLK#

Input

Stops CPU clock when low.

12

VSS

--

Ground.

13

VCC

--

Power supply.

14

CPUCLK

Output

CPU clock output (see Decoding table).

15

FS1

Input

CPU clock frequency select 1.

16

FS0

Input

CPU clock frequency select 0.