ATtiny87 Atmel Corporation, ATtiny87 Datasheet - Page 237
ATtiny87
Manufacturer Part Number
ATtiny87
Description
Manufacturer
Atmel Corporation
Specifications of ATtiny87
Flash (kbytes)
8 Kbytes
Pin Count
20
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
Hardware Qtouch Acquisition
No
Max I/o Pins
16
Ext Interrupts
16
Usb Speed
No
Usb Interface
No
Spi
2
Twi (i2c)
1
Uart
1
Lin
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
11
Adc Resolution (bits)
10
Adc Speed (ksps)
15
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
Yes
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
1.8 to 5.5
Operating Voltage (vcc)
1.8 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
2
Output Compare Channels
3
Input Capture Channels
1
Pwm Channels
9
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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21.7.12
21.7.13
21.7.14
8265B–AVR–09/10
Reading the Fuse and Lock Bits
Reading the Signature Bytes
Reading the 8 MHz RC Oscillator Calibration Byte
The algorithm for reading the Fuse and Lock bits is as follows (refer to
Flash” on page 232
Figure 21-6. Mapping Between BS1, BS2 and the Fuse and Lock Bits During Read
The algorithm for reading the Signature bytes is as follows (refer to
on page 232
The algorithm for reading the 8 MHz RC Oscillator Calibration byte is as follows (refer to
gramming the Flash” on page 232
1. A: Load Command “0000 0100
2. Set OE to “0”, BS2 to “0” and BS1 to “0”. The status of the Fuse Low bits can now be
3. Set OE to “0”, BS2 to “1” and BS1 to “1”. The status of the Fuse High bits can now be
4. Set OE to “0”, BS2 to “1”, and BS1 to “0”. The status of the Extended Fuse bits can
5. Set OE to “0”, BS2 to “0” and BS1 to “1”. The status of the Lock bits can now be read
6. Set OE to “1”.
1. A: Load Command “0000 1000
2. B: Load Address Low Byte (0x00 - 0x02).
3. Set OE to “0”, and BS to “0”. The selected Signature byte can now be read at DATA.
4. Set OE to “1”.
1. A: Load Command “0000 1000
2. B: Load Address Low Byte, 0x00.
3. Set OE to “0”, and BS1 to “1”. The 8 MHz RC Oscillator Calibration byte can now be
4. Set OE to “1”.
read at DATA (“0” means programmed).
read at DATA (“0” means programmed).
now be read at DATA (“0” means programmed).
at DATA (“0” means programmed).
read at DATA.
for details on Command and Address loading):
Extended Fuse Byte
Fuse High Byte
Fuse Low Byte
for details on Command loading):
Lock Bits
BS2
BS2
for details on Command and Address loading):
b
b
b
”.
”.
”.
0
1
0
1
BS1
0
1
“Programming the Flash”
DATA
“Programming the
“Pro-
237
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