ATmega32M1 Atmel Corporation, ATmega32M1 Datasheet - Page 213
ATmega32M1
Manufacturer Part Number
ATmega32M1
Description
Manufacturer
Atmel Corporation
Specifications of ATmega32M1
Flash (kbytes)
32 Kbytes
Pin Count
32
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
# Of Touch Channels
12
Hardware Qtouch Acquisition
No
Max I/o Pins
27
Ext Interrupts
27
Usb Speed
No
Usb Interface
No
Spi
1
Uart
1
Can
1
Lin
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
11
Adc Resolution (bits)
10
Adc Speed (ksps)
125
Analog Comparators
4
Resistive Touch Screen
No
Dac Channels
1
Dac Resolution (bits)
10
Temp. Sensor
Yes
Crypto Engine
No
Sram (kbytes)
2
Eeprom (bytes)
1024
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
2.7 to 5.5
Operating Voltage (vcc)
2.7 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
2
Output Compare Channels
14
Input Capture Channels
1
Pwm Channels
10
32khz Rtc
No
Calibrated Rc Oscillator
Yes
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Figure 20-12. LIN timing and frame time-out
20.5.11
20.5.12
8209D–AVR–11/10
T
T
T
Header_Nominal
Response_Nominal
Frame_Nominal
Break-in-data
Checksum
BREAK
CHECKSUM
Field
=
255
=
=
=
According to the LIN protocol, the LIN/UART controller can detect the BREAK/SYNC field
sequence even if the break is partially superimposed with a byte of the response. When a
BREAK/SYNC field sequence happens, the transfer in progress is aborted and the processing of
the new frame starts.
On the slave node, the BREAK detection is processed with the synchronization setting available
when the LIN/UART controller processed the (aborted) response. But the re-synchronization
restarts as usual. Due to a possible difference of timing reference between the BREAK field and
the rest of the frame, the time-out values can be slightly inaccurate.
The last field of a frame is the checksum.
In LIN 2.1, the checksum contains the inverted eight bit sum with carry over all data bytes and
the protected identifier. This calculation is called enhanced checksum.
In LIN 1.3, the checksum contains the inverted eight bit sum with carry over all data bytes. This
calculation is called classic checksum.
Frame identifiers 60 (0x3C) to 61 (0x3D) shall always use classic checksum.
T
• On slave node(s), an error is generated (that is, LBERR in case of Tx Response or LFERR in
• On master node, the user (code) is responsible for this aborting of frame. To do this, the
34 x
10 ( Number_of_Data + 1 ) x
T
–
Header
case of Rx Response). Information on data error is also available, refer to the
20.5.7.5
master task has first to abort the on-going communication (clearing LCMD bits - LIN Abort
command) and then to apply the Tx Header command. In this case, the abort error flag -
LABORT - is set
⎛
⎜
⎜
⎝
Header_Nominal +
SYNC
unsigned char
T
Bit
CHECKSUM
Field
⎛
⎜
⎜
⎝
⎛
⎜
⎜
⎝
∑
n
0
PROTECTED
IDENTIFIER
T
DATA n
=
Response_Nominal
255
T
–
⎞
⎟
⎟
⎠
Bit
⎛
⎜
⎜
⎝
Field
+
unsigned char
T
T
T
PROTECTED ID.
T
Nominal
Header_Maximum
Response_Maximum
Frame_Maximum
Frame
⎛
⎜
⎜
⎝
DATA-0
∑
n
0
DATA n
⎞
⎟
⎟
⎠
+
unsigned char
ATmega16M1/32M1/64M1
Field
⎞
⎟
⎟
⎠
=
=
=
+
1.4 x
1.4 x
T
unsigned char
Header_Maximum +
T
T
⎛
⎜
⎜
⎝
T
⎛
⎜
⎜
⎝
Header_Nominal
Response_Nominal
⎛
⎜
⎜
⎝
Response
∑
n
0
DATA-n
DATA n
⎛
⎜
⎜
⎝
⎛
⎜
⎜
⎝
∑
n
0
DATA n
⎞
⎟
⎟
⎠
Field
+
T
PROTECTED ID.
Response_Maximum
⎞
⎟
⎟
⎠
Maximun
»
8
CHECKSUM
⎞
⎟
⎟
⎠
⎞
⎟
⎟
⎠
Section
before Time-out
⎞
⎟
⎟
⎠
Field
»
8
⎞
⎟
⎟
⎠
⎞
⎟
⎟
⎠
213
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