ATmega8535 Atmel Corporation, ATmega8535 Datasheet - Page 253

• Manufacturer Part Number: ATmega8535
• Manufacturer: Atmel Corporation

Specifications of ATmega8535

• Flash (kbytes): 8 Kbytes
• Pin Count: 44
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 32
• Ext Interrupts: 3
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Uart: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 0.5
• Eeprom (bytes): 512
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 3
• Output Compare Channels: 4
• Input Capture Channels: 1
• Pwm Channels: 4
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

Data Polling EEPROM
2502K–AVR–10/06
When a new byte has been written and is being programmed into EEPROM, reading the
address location being programmed will give the value 0xFF. At the time the device is
ready for a new byte, the programmed value will read correctly. This is used to deter-
mine when the next byte can be written. This will not work for the value 0xFF, but the
user should have the following in mind: As a chip erased device contains 0xFF in all
locations, programming of addresses that are meant to contain 0xFF, can be skipped.
This does not apply if the EEPROM is reprogrammed without chip erasing the device. In
this case, data polling cannot be used for the value 0xFF, and the user will have to wait
at least t
value.
Table 108. Minimum Wait Delay Before Writing the Next Flash or EEPROM Location
Figure 125. Serial Programming Waveforms
Symbol
t
t
t
t
SERIAL DATA OUTPUT
WD_FLASH
WD_EEPROM
WD_ERASE
WD_FUSE
SERIAL CLOCK INPUT
SERIAL DATA INPUT
WD_EEPROM
SAMPLE
(MOSI)
(MISO)
(SCK)
before programming the next byte. See Table 108 for t
MSB
MSB
Minimum Wait Delay
4.5 ms
9.0 ms
9.0 ms
4.5 ms
ATmega8535(L)
LSB
LSB
WD_EEPROM
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