ATtiny87 Atmel Corporation, ATtiny87 Datasheet - Page 163
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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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Price
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15.3
15.3.1
15.3.2
8265B–AVR–09/10
LIN Protocol
Master and Slave
Frames
BREAK
Break Delimiter
Field
HEADER
A LIN cluster consists of one master task and several slave tasks. A master node contains the
master task as well as a slave task. All other nodes contain a slave task only.
Figure 15-1. LIN cluster with one master node and “n” slave nodes
The master task decides when and which frame shall be transferred on the bus. The slave
tasks provide the data transported by each frame. Both the master task and the slave task are
parts of the Frame handler
A frame consists of a header (provided by the master task) and a response (provided by a
slave task).
The header consists of a BREAK and SYNC pattern followed by a PROTECTED IDENTIFIER.
The identifier uniquely defines the purpose of the frame. The slave task appointed for provid-
ing the response associated with the identifier transmits it. The response consists of a DATA
field and a CHECKSUM field.
Figure 15-2. Master and slave tasks behavior in LIN frame
The slave tasks waiting for the data associated with the identifier receives the response and
uses the data transported after verifying the checksum.
Figure 15-3. Structure of a LIN frame
Slave Task 1
Slave Task 2
SYNC
Master Task
Field
master node
master task
slave task
PROTECTED
IDENTIFIER
HEADER
Response Space
Field
FRAME SLOT
RESPONSE
DATA-0
slave node
slave task
LIN bus
Field
1
RESPONSE
Each byte field is transmitted as a serial byte, LSB first.
DATA-n
HEADER
Inter-Byte Space
Field
slave node
slave task
CHECKSUM
n
RESPONSE
Field
Inter-Frame Space
163
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