 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
CS7654 Datasheet(PDF) 26 Page - Cirrus Logic |
|
||||||||||||||||||||||||||||||
CS7654 Datasheet(HTML) 26 Page - Cirrus Logic |
|
|
26 / 62 page  CS7654 26 Address Set Operation The ADDRESS SET format consists of a two-byte packet which sets the address of a subsequent READ operation. The first byte of the Station Ad- dress with the LSB (data direction bit) set LOW to indicate a write operation. The second byte is the register address (0..255). The ADDRESS SET for- mat is the same as the WRITE format, without the register data (third byte). Read Operations in Three-Byte Mode The READ operation may consist of two or more bytes. The first byte is the station address with the LSB (data direction bit) set HIGH indicating a read operation. The addressed device then sends one or more bytes back from the register last addressed by the previous WRITE operation or the previous AD- DRESS SET operation. Operating CS7654 in Four-Byte I 2C Config- uration In this configuration the external controller talks only to the CS7654 through the primary I2C inter- face. All the other slave devices on the camera board are tied to the secondary I2C port of the CS7654. WRITE and READ packets only are de- fined in four-byte mode. Independent address set operations to slave devices on the secondary I2C bus is not allowed in four-byte mode. Four-byte mode is active when the P4BYTMODE pin (pin 46) is logic high. Write Operations in Four-Byte mode All WRITE operations from an external controller, through the CS7654, to any slave device must use the four-byte mode; this includes writing to the CS7654 itself. The external controller sends a four- byte WRITE command to the CS7654 which ini- tiates a WRITE operation to the destination slave device and sets the I2CBUSY bit in the status reg- ister ( 01h at SA 0x34h ). The I2CBUSY bit is cleared when the write operation on the secondary bus is complete. The External controller can poll the status register to check if the CS7654 has com- pleted the command. The CS7654 has a one-command-buffer which al- lows the external controller to queue one additional command while the current command is still being executed. If more than one command is sent before the I2CBUSY bit is cleared, the CS7654 saves only the last command and executes it after the current one is completed. Commands that involve writing Byte Sequence WRITE Format Packet Detail First Byte Station Address with LSB Set LOW Second Byte Device Register Address (0..255) Third Byte Register Data (0..255) Table 6. WRITE Format Packet Byte Sequence ADDRESS SET format Packet Details First Byte Station Address with LSB Set LOW Second Byte Device Register Address (0..255) Table 7. ADDRESS SET Format Packet Operation External EPROM CS7615 CS7654 controller Figure 16. I 2C configuration showing primary and secondary I 2C busses. To other sub-systems Byte Sequence READ Format Packet Details First Byte Station Address with LSB set HIGH; Source Device then Returns One Byte of Register Data (0..255) Second Byte Returned data from CS7654 Table 8. READ Format Packet. |
Similar Part No. - CS7654 |
|
Similar Description - CS7654 |
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.NET |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
