ATtiny87 Atmel Corporation, ATtiny87 Datasheet - Page 167
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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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15.4.5
15.4.6
15.4.6.1
8265B–AVR–09/10
Enable / Disable
LIN Commands
Rx Header / LIN Abort Function
Table 15-1.
Setting the LENA bit in LINCR register enables the LIN/UART controller. To disable the
LIN/UART controller, LENA bit must be written to 0. No wait states are implemented, so, the
disable command is taken into account immediately.
Clearing the LCMD[2] bit in LINCR register enables LIN commands.
As shown in
register are available (c.f.
This function (or state) is mainly the withdrawal mode of the controller.
When the controller has to execute a master task, this state is the start point before enabling a
Tx Header command.
When the controller has only to execute slave tasks, LIN header detection/acquisition is
enabled as background function. At the end of such an acquisition (Rx Header function), auto-
matically the appropriate flags are set, and in LIN 1.3, the LINDLR register is set with the
uncoded length value.
This state is also the start point before enabling the Tx or the Rx Response command.
A running function (i.e. Tx Header, Tx or Rx Response ) can be aborted by clearing LCMD[1:0]
bits in LINCR register
LABORT - in LINERR register will be set to inform the other software tasks. No wait states are
implemented, so, the abort command is taken into account immediately.
Rx Header function is responsible for:
LENA
• The BREAK field detection,
• The hardware re-synchronization analyzing the SYNCH field,
• The reception of the PROTECTED IDENTIFIER field, the parity control and the update of
• The starting of the Frame_Time_Out,
• The checking of the LIN communication integrity.
the LINDLR register in case of LIN 1.3,
0
1
LCMD[2]
Table 15-1 on page
x
0
1
LIN/UART Command List
LCMD[1]
(See ”Break-in-data” on page
x
0
1
0
1
0
1
Figure 15-5 on page
LCMD[0]
167, four functions controlled by the LCMD[1:0] bits of LINCR
x
0
1
0
1
0
0
1
1
Rx Header - LIN Abort
Disable peripheral
166).
Rx Response
Tx Response
Byte transfer
Command
Full duplex
Tx Header
Rx Byte
Tx Byte
177.). In this case, an abort flag -
(LINDLR: read only register)
LCMD[2:0]=000 after Rx
LCMD[2:0]=000 after Tx
LCMD[2:0]=000 after Tx
no CRC, no Time out
LTXDL=LRXDL=0
LIN Withdrawal
Comment
167