AT94K10AL-25AQC Atmel, AT94K10AL-25AQC Datasheet - Page 144
AT94K10AL-25AQC
Manufacturer Part Number
AT94K10AL-25AQC
Description
IC FPSLIC 10K GATE 25MHZ 100TQFP
Manufacturer
Atmel
Series
FPSLIC®r
Specifications of AT94K10AL-25AQC
Core Type
8-bit AVR
Speed
25MHz
Interface
I²C, UART
Program Sram Bytes
20K-32K
Fpga Sram
4kb
Data Sram Bytes
4K ~ 16K
Fpga Core Cells
576
Fpga Gates
10K
Fpga Registers
846
Voltage - Supply
3 V ~ 3.6 V
Mounting Type
Surface Mount
Operating Temperature
0°C ~ 70°C
Package / Case
100-TQFP, 100-VQFP
For Use With
ATSTK594 - BOARD FPSLIC DAUGHTER FOR STK500
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
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AT94KAL Series FPSLIC
The 2-wire Serial Data Register – TWDR
• Bits 7..0 - TWD: 2-wire Serial Data Register
These eight bits constitute the next data byte to be transmitted, or the latest data byte received
on the 2-wire Serial Bus.
In transmit mode, TWDR contains the next byte to be transmitted. In receive mode, the TWDR
contains the last byte received. It is writable while the 2-wire Serial Interface is not in the process
of shifting a byte. This occurs when the 2-wire Serial Interrupt flag (TWINT) is set by the hard-
ware. Note that the data register cannot be initialized by the user before the first interrupt occurs.
The data in TWDR remains stable as long as TWINT is set. While data is shifted out, data on the
bus is simultaneously shifted in. TWDR always contains the last byte present on the bus, except
after a wake up from Power-down Mode, or Power-save Mode by the 2-wire Serial Interrupt. For
example, in the case of the lost bus arbitration, no data is lost in the transition from Master-to-
Slave. Receiving the ACK flag is controlled by the 2-wire Serial Logic automatically, the CPU
cannot access the ACK bit directly.
The 2-wire Serial (Slave) Address Register – TWAR
• Bits 7..1 - TWA: 2-wire Serial Slave Address Register
These seven bits constitute the Slave address of the 2-wire Serial Bus interface unit.
• Bit 0 - TWGCE: 2-wire Serial General Call Recognition Enable Bit
This bit enables, if set, the recognition of the General Call given over the 2-wire Serial Bus.
The TWAR should be loaded with the 7-bit Slave address (in the seven most significant bits of
TWAR) to which the 2-wire Serial Interface will respond when programmed as a Slave transmit-
ter or receiver, and not needed in the Master modes. The LSB of TWAR is used to enable
recognition of the general call address ($00). There is an associated address comparator that
looks for the Slave address (or general call address if enabled) in the received serial address. If
a match is found, an interrupt request is generated.
Bit
$1F ($3F)
Read/Write
Initial Value
Bit
$1E ($3E)
Read/Write
Initial Value
7
MSB
R/W
1
7
MSB
R/W
1
6
R/W
1
6
R/W
1
5
R/W
1
5
R/W
1
4
R/W
1
4
R/W
1
3
R/W
1
3
R/W
1
2
R/W
1
2
R/W
1
1
R/W
1
1
LSB
R/W
1
R/W
0
LSB
1
0
TWGCE
R/W
0
1138I–FPSLI–1/08
TWDR
TWAR
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