ATtiny87 Atmel Corporation, ATtiny87 Datasheet - Page 228
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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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21.4
21.5
21.6
21.6.1
228
Calibration Byte
Page Size
Parallel Programming Parameters, Pin Mapping, and Commands
ATtiny87/ATtiny167
Signal Names
The ATtiny87/167 has a byte calibration value for the internal RC Oscillator. This byte resides
in the high byte of address 0x000 in the signature address space. During reset, this byte is
automatically written into the OSCCAL Register to ensure correct frequency of the calibrated
RC Oscillator.
Table 21-7.
Table 21-8.
This section describes how to parallel program and verify Flash Program memory, EEPROM
Data memory, Memory Lock bits, and Fuse bits in the ATtiny87/167. Pulses are assumed to
be at least 250 ns unless otherwise noted.
In this section, some pins of the ATtiny87/167 are referenced by signal names describing their
functionality during parallel programming, see
in the following table are referenced by pin names.
The XA1/XA0 pins determine the action executed when the XTAL1 pin is given a positive
pulse. The bit coding is shown in
When pulsing WR or OE, the command loaded determines the action executed. The different
commands are shown in
ATtiny167
ATtiny167
ATtiny87
ATtiny87
Device
Device
Number of Words in a Page and No. of Pages in the Flash
Number of Words in a Page and No. of Pages in the EEPROM
EEPROM Size Page Size PCWORD No. of Pages PCPAGE EEAMSB
Flash Size
4K words
8K words
512 bytes
Figure
21-12.
Figure
Page Size
64 words
64 words
4 bytes
21-11.
Figure 21-1
PCWORD
PC[5:0]
PC[5:0]
EEA[1:0]
and
No. of Pages
Figure
128
128
64
21-9. Pins not described
PCPAGE
EEA[8:2]
PC[11:6]
PC[12:6]
8265B–AVR–09/10
PCMSB
11
12
8
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