ATtiny2313A Atmel Corporation, ATtiny2313A Datasheet - Page 175

• Manufacturer Part Number: ATtiny2313A
• Manufacturer: Atmel Corporation

Specifications of ATtiny2313A

• Flash (kbytes): 2 Kbytes
• Pin Count: 20
• Max. Operating Frequency: 20 MHz
• Cpu: 8-bit AVR
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 18
• Ext Interrupts: 18
• Usb Speed: No
• Usb Interface: No
• Spi: 2
• Twi (i2c): 1
• Uart: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 0.12
• Eeprom (bytes): 128
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: Yes
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8 to 5.5
• Operating Voltage (vcc): 1.8 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 4
• Input Capture Channels: 1
• Pwm Channels: 4
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

19.4.2
19.4.3
19.4.4
8246B–AVR–09/11
Page Erase
Page Load
Page Write
Although the least significant bit of the Z-register (Z0) should be zero for SPM, it should be noted
that the LPM instruction addresses the Flash byte-by-byte and uses Z0 as a byte select bit.
Once a programming operation is initiated, the address is latched and the Z-pointer can be used
for other operations.
To execute Page Erase:
The data in R1 and R0 is ignored. The page address must be written to PCPAGE in the Z-regis-
ter. Other bits in the Z-pointer are ignored during this operation.
If an interrupt occurs during the timed sequence above the four cycle access cannot be guaran-
teed. In order to ensure atomic operation interrupts should be disabled before writing to
SPMCSR.
The CPU is halted during the Page Erase operation.
To write an instruction word:
The content of PCWORD in the Z-register is used to address the data in the temporary buffer.
The temporary buffer will auto-erase after a Page Write operation, or by writing the RWWSRE bit
in SPMCSR. It is also erased after a system reset.
Note that it is not possible to write more than one time to each address without erasing the tem-
porary buffer.
If the EEPROM is written in the middle of an SPM Page Load operation, all data loaded will be
lost.
To execute Page Write:
The data in R1 and R0 is ignored. The page address must be written to PCPAGE. Other bits in
the Z-pointer must be written to zero during this operation.
The CPU is halted during the Page Write operation.
• Set up the address in the Z-pointer
• Write “00000011” to SPMCSR
• Execute an SPM instruction within four clock cycles after writing SPMCSR
• Set up the address in the Z-pointer
• Set up the data in R1:R0
• Write “00000001” to SPMCSR
• Execute an SPM instruction within four clock cycles after writing SPMCSR
• Set up the address in the Z-pointer
• Write “00000101” to SPMCSR
• Execute an SPM instruction within four clock cycles after writing SPMCSR
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