AT90PWM81 Atmel Corporation, AT90PWM81 Datasheet - Page 260

• Manufacturer Part Number: AT90PWM81
• Manufacturer: Atmel Corporation

Specifications of AT90PWM81

• Flash (kbytes): 8 Kbytes
• Pin Count: 20
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 20
• Ext Interrupts: 3
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 11
• Adc Resolution (bits): 10
• Adc Speed (ksps): 125
• Analog Comparators: 3
• Resistive Touch Screen: No
• Dac Channels: 1
• Dac Resolution (bits): 10
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 0.25
• Eeprom (bytes): 512
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 125
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 1
• Output Compare Channels: 8
• Input Capture Channels: 1
• Pwm Channels: 6
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

21.7.11
21.7.12
21.7.13
260
AT90PWM81
Programming the Lock Bits
Reading the Fuse and Lock Bits
Reading the Signature Bytes
The algorithm for programming the Lock bits is as follows (refer to
for details on Command and Data loading):
The Lock bits can only be cleared by executing Chip Erase.
The algorithm for reading the Fuse and Lock bits is as follows (refer to
256
Figure 21-6.
The algorithm for reading the Signature bytes is as follows (refer to
for details on Command and Address loading):
1.
2.
3.
1.
2.
3.
4.
5.
6.
1.
2.
3.
4.
for details on Command loading):
A: Load Command “0010 0000”.
C: Load Data Low Byte. Bit n = “0” programs the Lock bit. If LB mode 3 is programmed (LB1
and LB2 is programmed), it is not possible to program the Boot Lock bits by any External Pro-
gramming mode.
Give WR a negative pulse and wait for RDY/BSY to go high.
A: Load Command “0000 0100”.
Set OE to “0”, BS2 to “0” and BS1 to “0”. The status of the Fuse Low bits can now be read at
DATA (“0” means programmed).
Set OE to “0”, BS2 to “1” and BS1 to “1”. The status of the Fuse High bits can now be read at
DATA (“0” means programmed).
Set OE to “0”, BS2 to “1”, and BS1 to “0”. The status of the Extended Fuse bits can now be read
at DATA (“0” means programmed).
Set OE to “0”, BS2 to “0” and BS1 to “1”. The status of the Lock bits can now be read at DATA
(“0” means programmed).
Set OE to “1”.
A: Load Command “0000 1000”.
B: Load Address Low Byte (0x00 - 0x02).
Set OE to “0”, and BS1 to “0”. The selected Signature byte can now be read at DATA.
Set OE to “1”.
Mapping Between BS1, BS2 and the Fuse and Lock Bits During Read
Fuse Low Byte
Extended Fuse Byte
Fuse High Byte
Lock Bits
BS2
BS2
0
1
0
1
BS1
“Programming the Flash” on page 256
“Programming the Flash” on page 256
“Programming the Flash” on page
0
1
DATA
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