ICS1523

MDS 1523 Y

12

Revision 110905

Integrated Circuit Systems

525 Race Street, San Jose, CA 95126

tel (408) 297-1201

www.icst.com

Section 11 Programming

Note:

or read from the ICS1523.

re-address the ICS1523. The software:

– Must NOT just index 0 and then do all the I/O as one-byte transactions.

– Must break the transactions into at least two separate bus transactions:

(1) 00 to 08 (2) 10 to 12

Write Procedure for Single Register

MSB

LSB

S 010 01 1X 0 A

A

A

Device address

Register Index

Data

Read Procedure for Single Register

MSB

LSB

MSB

LSB

S 010 01 1X 0 A

A S 01 00 11X 1 A

A

Device address

Register Index

Device address

Data

Repeat START

NO Acknow ledge

Write Procedure for Multiple Registers (Note 1)

MSB

LSB

S 010 01 1X 0 A

A

A

A

A

Device address

Register Index

Data

Data

Read Procedure for M ultiple Registers (Note 1)

MSB

LSB

MSB

LSB

S 010 01 1X 0 A

A S 01 00 11X 1 A

A

A

Device address

Register Index

Device address

Data

Data

Repeat START

NO Acknow ledge

Legend

All values are sent with the most-significant bit (MSB) first and least-significant bit (LSB) last.

R

= Read = 1

W

= Write = 0

A

= ACK = Acknowledge = 0

A

= ACK = No Acknowledge = 1

= (Dashed Line) Multiple transactions

Bus Master drives signal to ICS1523

ICS1523 (Slave Device) drives signal to Bus Master

Stop

Stop

Stop

Stop