AT90S2313-4PI Atmel, AT90S2313-4PI Datasheet - Page 60

• Manufacturer Part Number: AT90S2313-4PI
• Description: IC MCU 2K 4MHZ UART LV IT 20DIP
• Manufacturer: Atmel
• Series: AVR® 90Sr

Specifications of AT90S2313-4PI

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 4MHz
• Connectivity: SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 15
• 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: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 20-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
Signature Bytes
Programming the Flash
and EEPROM
60
AT90S2313
The AT90S2313 MCU provides two Lock bits that can be left unprogrammed (“1”) or can
be programmed (“0”) to obtain the additional features listed in Table 21. The Lock bits
can only be erased with the Chip Erase operation.
Table 21. Lock Bit Protection Modes
Note:
The AT90S2313 has two Fuse bits: SPIEN and FSTRT.
•
•
The Fuse bits are not accessible in Serial Programming mode. The status of the fuses
are not affected by Chip Erase.
All Atmel microcontrollers have a 3-byte signature code that identifies the device. This
code can be read in both serial and parallel mode. The three bytes reside in a separate
address space.
For the AT90S2313
Note:
Atmel’s AT90S2313 offers 2K bytes of In-System Reprogrammable Flash Program
memory and 128 bytes of EEPROM Data memory.
The AT90S2313 is shipped with the On-chip Flash Program and EEPROM Data mem-
ory arrays in the erased state (i.e., contents = $FF) and ready to be programmed. This
device supports a high-voltage (12V) Parallel Programming mode and a low-voltage
Serial Programming mode. The +12V is used for programming enable only, and no cur-
rent of significance is drawn by this pin. The Serial Programming mode provides a
convenient way to download program and data into the AT90S2313 inside the user’s
system.
The program and EEPROM memory arrays in the AT90S2313 are programmed byte-
by-byte in either programming mode. For the EEPROM, an auto-erase cycle is provided
Mode
Memory Lock Bits
1
2
3
When the SPIEN Fuse is programmed (“0”), Serial Program and Data Downloading
is enabled. The default value is programmed (“0”).
When the FSTRT Fuse is programmed (“0”), the short start-up time is selected. The
default value is unprogrammed (“1”). Parts with this bit pre-programmed (“0”) can be
delivered on demand.
1. $000: $1E (indicates manufactured by Atmel).
2. $001: $91 (indicates 2 Kb Flash memory).
3. $002: $01 (indicates AT90S2313 device when signature byte $001 is $91).
1. In the Parallel mode, further programming of the Fuse bits are also disabled. Program
1. When both Lock bits are programmed (Lock mode 3), the signature bytes cannot be
LB1
the Fuse bits before programming the Lock bits.
read in serial mode. Reading the signature bytes will return: $00, $01 and $02.
1
0
0
LB2
1
1
0
(1)
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.
0839I–AVR–06/02
(1)