ATtiny87 Atmel Corporation, ATtiny87 Datasheet - Page 236
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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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21.7.9
21.7.10
21.7.11
236
ATtiny87/ATtiny167
Programming the Fuse High Bits
Programming the Extended Fuse Bits
Programming the Lock Bits
PAGEL / BS1
RESET +12V
The algorithm for programming the Fuse High bits is as follows (refer to
Flash” on page 232
The algorithm for programming the Extended Fuse bits is as follows (refer to
the Flash” on page 232
Figure 21-5. Programming the FUSES Waveforms
The algorithm for programming the Lock bits is as follows (refer to
page 232
XA1 / BS2
RDY/BSY
1. A: Load Command “0100 0000
2. C: Load Data Low Byte. Bit n = “0” programs and bit n = “1” erases the Fuse bit.
3. Set BS1 to “1” and BS2 to “0”. This selects high data byte.
4. Give WR a negative pulse and wait for RDY/BSY to go high.
5. Set BS1 to “0”. This selects low data byte.
1. A: Load Command “0100 0000
2. C: Load Data Low Byte. Bit n = “0” programs and bit n = “1” erases the Fuse bit.
3. Set BS1 to “0” and BS2 to “1”. This selects extended data byte.
4. Give WR a negative pulse and wait for RDY/BSY to go high.
5. Set BS2 to “0”. This selects low data byte.
1. A: Load Command “0010 0000
2. C: Load Data Low Byte. Bit n = “0” programs the Lock bit. If LB mode 3 is pro-
3. Give WR a negative pulse and wait for RDY/BSY to go high.
4. The Lock bits can only be cleared by executing Chip Erase.
XTAL1
DATA
XA0
WR
OE
grammed (LB1 and LB2 is programmed), it is not possible to re-program the Lock bits
by any External Programming mode.
for details on Command and Data loading):
0x40
A
DATA
C
for details on Command and Data loading):
Write Fuse Low byte
for details on Command and Data loading):
XX
b
b
b
”.
”.
”.
0x40
A
DATA
C
Write Fuse high byte
XX
“Programming the Flash” on
0x40
A
Write Extended Fuse byte
DATA
“Programming the
C
“Programming
8265B–AVR–09/10
XX
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