AT90LS2343-1PI Atmel, AT90LS2343-1PI Datasheet - Page 32
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AT90LS2343-1PI
Manufacturer Part Number
AT90LS2343-1PI
Description
IC MCU 2K FLASH 1MHZ IND 8-DIP
Manufacturer
Atmel
Series
AVR® 90LSr
Specifications of AT90LS2343-1PI
Core Processor
AVR
Core Size
8-Bit
Speed
1MHz
Connectivity
SPI
Peripherals
Brown-out Detect/Reset, POR, WDT
Number Of I /o
5
Program Memory Size
2KB (1K x 16)
Program Memory Type
FLASH
Eeprom Size
128 x 8
Ram Size
128 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 6 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
8-DIP (0.300", 7.62mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Data Converters
-
EEPROM Read/Write
Access
EEPROM Address Register –
EEAR
EEPROM Data Register –
EEDR
32
AT90S/LS2323/2343
The EEPROM access registers are accessible in the I/O space.
The write access time is in the range of 2.5 - 4 ms, depending on the V
self-timing function, however, lets the user software detect when the next byte can be
written.
In order to prevent unintentional EEPROM writes, a specific write procedure must be fol-
lowed. Refer to the description of the EEPROM Control Register for details on this.
When the EEPROM is written, the CPU is halted for two clock cycles before the next
instruction is executed. When the EEPROM is read, the CPU is halted for four clock
cycles before the next instruction is executed.
• Bit 7 – Res: Reserved Bit
This bit is a reserved bit in the AT90S2323/2343 and will always read as zero.
• Bit 6..0 – EEAR6..0: EEPROM Address
The EEPROM Address Register (EEAR6..0) specifies the EEPROM address in the
128-byte EEPROM space. The EEPROM data bytes are addressed linearly between 0
and 127.
• Bits 7..0 – EEDR7..0: EEPROM Data
For the EEPROM write operation, the EEDR register contains the data to be written to
the EEPROM in the address given by the EEAR register. For the EEPROM read opera-
tion, the EEDR contains the data read out from the EEPROM at the address given by
EEAR.
Bit
$1E ($3E)
Read/Write
Initial Value
Bit
$1D ($3D)
Read/Write
Initial Value
MSB
R/W
R
7
–
0
7
0
EEAR6
R/W
R/W
6
0
6
0
EEAR5
R/W
R/W
5
0
5
0
EEAR4
R/W
R/W
4
0
4
0
EEAR3
R/W
R/W
3
0
3
0
EEAR2
R/W
R/W
2
0
2
0
EEAR1
R/W
R/W
1
0
1
0
EEAR0
LSB
R/W
R/W
CC
0
0
0
0
voltages. A
1004D–09/01
EEAR
EEDR