Pin Configuration

Pin Descriptions

PIN

NUMBER

PIN

NAME

TYPE

DESCRIPTION

1

CPUS2

I

Select 2 for 2XCPU and CPU frequencies. See Table above.

2

X2

O

Crystal connection. Connect to 32.768 kHz crystal. Includes internal

XTAL load capacitance.

3

X1

I

Crystal connection. Connect to 32.768 kHz crystal. This pin includes

internal XTAL load capacitance and feedback bias for a 32.768 kHz crystal.

4

VDD32

P

Separate power supply connection for 32.768 kHz clock. Will operate down to

2.0V, independent of the rest of the circuit VDD.

5

VDD

P

Connect to +3.3V or +5V.

6

GND

P

Connect to ground.

7

24M

O

24 MHz floppy (or super I/O) clock output.

8

32K

O

32.768 kHz square wave clock output.

9

KBOUT

O

Keyboard clock output, fixed 16 MHz (-06) or 12 MHz (-07).

10

PD24+KBD

I

Power-down 24M+keyboard. Shuts off both clock outputs, pins 7 & 9 when

low.

11

14.3M

O

14.318 MHz system clock output.

12

GND

P

Connect to ground.

13

VDD

P

Connect to +3.3V or +5V.

14

CPUCLK

O

CPUCLK output. See Table above.

15

CPUS0

I

Select 0 for 2XCPU and CPU frequencies. See Table above.

16

CPUS1

I

Select 1 for 2XCPU and CPU frequencies. See Table above.

CPUS2

1

16

CPUS1

X2

2

15

CPUS0

X1

3

14

CPUCLK

VDD32

4

13

VDD

VDD

5

12

GND

GND

6

11

14.3M

24M

7

10

PD24+KDB

32K

8

9

KBOUT

16-Pin SOIC

Decoding Table for CPU Clock

CPUS2

CPUS1

CPUS0

CPUCLK (MHz)

0

0

0

Off+14M off

0

0

1

80.00

0

1

0

25.00

0

1

1

66.66

1

0

0

20.00

1

0

1

50.00

1

1

0

33.33

11

1

4.00

ICS9134 Option

KEYBOARD CLOCK

-06

-07

KBOUT

16 MHz

12 MHz

ICS9134-06

ICS9134-07

2