AT90LS2323-4PC Atmel, AT90LS2323-4PC Datasheet - Page 37
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AT90LS2323-4PC
Manufacturer Part Number
AT90LS2323-4PC
Description
IC MCU 2K FLSH 4MHZ LV 8DIP
Manufacturer
Atmel
Series
AVR® 90LSr
Datasheet
1.AT90LS2323-4PC.pdf
(64 pages)
Specifications of AT90LS2323-4PC
Core Processor
AVR
Core Size
8-Bit
Speed
4MHz
Connectivity
SPI
Peripherals
Brown-out Detect/Reset, POR, WDT
Number Of I /o
3
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
0°C ~ 70°C
Package / Case
8-DIP (0.300", 7.62mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Data Converters
-
Memory Programming
Program and Data
Memory Lock Bits
Fuse Bits in
AT90S/LS2323
Fuse Bits in
AT90S/LS2343
Signature Bytes
1004D–09/01
The AT90S2323/2343 MCU provides two Lock bits that can be left unprogrammed (“1”)
or can be programmed (“0”) to obtain the additional features listed in Table 14. The Lock
bits can only be erased with the Chip Erase operation.
Table 14. Lock Bit Protection Modes
Note:
The AT90S/LS2323 has two Fuse bits, SPIEN and FSTRT.
•
•
The status of the Fuse bits is not affected by Chip Erase.
The AT90S/LS2343 has two Fuse bits, SPIEN and RCEN.
•
•
The status of the Fuse bits is not affected by Chip Erase.
All Atmel microcontrollers have a three-byte signature code that identifies the device.
The three bytes reside in a separate address space.
For the AT90S/LS2323
1. $000: $1E (indicates manufactured by Atmel)
2. $001: $91 (indicates 2K bytes Flash memory)
3. $002: $02 (indicates AT90S/LS2323 when signature byte $001 is $91)
For AT90S/LS2343
1. $000: $1E (indicates manufactured by Atmel)
2. $001: $91 (indicates 2K bytes Flash memory)
Mode
Memory Lock Bits
1
2
3
When the SPIEN Fuse is programmed (“0”), Serial Program and Data Downloading
are enabled. Default value is programmed (“0”). This bit is not accessible in the low-
voltage Serial Programming mode.
When the FSTRT Fuse is programmed (“0”), the shortest start-up time is selected
as indicated in Table 6 on page 21. Default value is programmed (“0”). Changing the
FSTRT Fuse does not take effect until the next Power-on Reset. In AT90S/LS2343
the start-up time is fixed.
When the SPIEN Fuse is programmed (“0”), Serial Program and Data Downloading
are enabled. Default value is programmed (“0”). This bit is not accessible in the low-
voltage Serial Programming mode.
When the RCEN Fuse is programmed (“0”), the internal RC oscillator is selected as
the MCU clock source. Default value is programmed ("0") in AT90LS2343-1. Default
value is un-programmed ("1") in AT90LS2343-4 and AT90S2343-10. Changing the
RCEN Fuse does not take effect until the next Power-on Reset. AT90S/LS2323
cannot select the internal RC oscillator as the MCU source.
1. In the high-voltage Serial Programming mode, further programming of the Fuse bits
LB1
are also disabled. Program the Fuse bits before programming the Lock bits.
1
0
0
LB2
1
1
0
(Note:)
(Note:)
, they are:
Protection Type
No memory lock features enabled.
Further programming of the Flash and EEPROM is disabled.
Same as mode 2, and verify is also disabled.
, they are:
AT90S/LS2323/2343
(1)
37