AT94K05AL-25BQU Atmel, AT94K05AL-25BQU Datasheet - Page 148

• Manufacturer Part Number: AT94K05AL-25BQU
• Description: IC FPSLIC 5K GATE 25MHZ 144-LQFP
• Manufacturer: Atmel
• Series: FPSLIC®r

Specifications of AT94K05AL-25BQU

• Core Type: 8-bit AVR
• Speed: 25MHz
• Interface: I²C, UART
• Program Sram Bytes: 4K-16K
• Fpga Sram: 2kb
• Data Sram Bytes: 4K ~ 16K
• Fpga Core Cells: 256
• Fpga Gates: 5K
• Fpga Registers: 436
• Voltage - Supply: 3 V ~ 3.6 V
• Mounting Type: Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 144-LQFP
• For Use With: ATSTK594 - BOARD FPSLIC DAUGHTER FOR STK500
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

4.30.1.5
Miscellaneous States
There are two status codes that do not correspond to a defined 2-wire Serial Interface state: Sta-
tus $F8 and Status $00, see
Table
4-33.
Status $F8 indicates that no relevant information is available because the 2-wire Serial Interrupt
flag (TWINT) is not set yet. This occurs between other states, and when the 2-wire Serial Inter-
face is not involved in a serial transfer.
Status $00 indicates that a bus error has occurred during a 2-wire serial transfer. A bus error
occurs when a START or STOP condition occurs at an illegal position in the format frame.
Examples of such illegal positions are during the serial transfer of an address byte, a data byte
or an acknowledge bit. When a bus error occurs, TWINT is set. To recover from a bus error, the
TWSTO flag must set and TWINT must be cleared by writing a logic 1 to it. This causes the 2-
wire Serial Interface to enter the not addressed Slave mode and to clear the TWSTO flag (no
other bits in TWCR are affected). The SDA and SCL lines are released and no STOP condition
is transmitted.
AT94KAL Series FPSLIC
148
1138I–FPSLI–1/08