at88sc0104ca ATMEL Corporation, at88sc0104ca Datasheet - Page 7

• Manufacturer Part Number: at88sc0104ca
• Description: Cryptomemory
• Manufacturer: ATMEL Corporation

8. Device Operations for Synchronous Protocols
8.1
8.1.1
8.1.2
8.1.3
8.2
Figure 8-1.
5200BS–CRYPT–2/09
Clock and Data Transitions
Memory Reset
Start Condition
Stop Condition
ACKNOWLEDGE
Bus Time for 2-Wire Serial Communications. SCL: Serial Clock, SDA: Serial Data I/O
The SDA pin is normally pulled high with an external device. Data on the SDA pin may change
only during SCL low time periods (see
periods will indicate a start or stop condition as defined below.
A high-to-low transition of SDA with SCL high defines a START condition which must precede all
commands (see
A low-to-high transition of SDA with SCL high defines a STOP condition. After a read sequence,
the STOP condition will place the EEPROM in a standby power mode (see
8).
All addresses and data words are serially transmitted to and from the EEPROM in 8-bit words.
The EEPROM sends a zero to acknowledge that it has received each word. This happens dur-
ing the ninth clock cycle (see
After an interruption in communication due protocol errors, power loss or any reason, perform
"Acknowledge Polling" to properly recover from the condition. Acknowledge polling consists of
sending a start condition followed by a valid CryptoMemory command byte and determining if
the device responded with an ACKNOWLEDGE.
Figure 8-4 on page
Figure 8-5 on page
8).
Figure 8-3 on page
9).
8). Data changes during SCL high
Figure 8-4 on page
7