ATmega16M1 Atmel Corporation, ATmega16M1 Datasheet - Page 172

• Manufacturer Part Number: ATmega16M1
• Manufacturer: Atmel Corporation

Specifications of ATmega16M1

• Flash (kbytes): 16 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): 1
• 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: 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

19.5.3
19.5.4
19.5.5
19.6
172
Message Objects
ATmega16M1/32M1/64M1
Baud Rate
Fault Confinement
Overload Frame
With no baud rate prescaler (BRP[5..0]=0) the sampling point comes one time quantum too
early. This leads to a fail according the ISO16845 Test plan. It is necessary to lengthen the
Phase Segment 1 by one time quantum and to shorten the Phase Segment 2 by one time quan-
tum to compensate. The baud rate selection is made by T
Notes:
(C.f.
An overload frame is sent by setting an overload request (OVRQ). After the next reception, the
CAN channel sends an overload frame in accordance with the CAN specification. A status or
flag is set (OVRF) as long as the overload frame is sent.
Figure 19-9. Overload Frame
The MOb is a CAN frame descriptor. It contains all information to handle a CAN frame. This
means that a MOb has been outlined to allow to describe a CAN message like an object. The set
of MObs is the front end part of the “mailbox” where the messages to send and/or to receive are
pre-defined as well as possible to decrease the work load of the software.
The MObs are independent but priority is given to the lower one in case of multi matching. The
operating modes are:
1. Tsyns = 1 × Tscl = (BRP[5..0] + 1)/clk
2. Tprs = (1 to 8) × Tscl = (PRS[2..0] + 1) × Tscl
3. Tphs1 = (1 to 8) × Tscl = (PHS1[2..0] + 1) × Tscl
4. Tphs2 = (1 to 8) × Tscl = (PHS2[2..0]
5. Tsjw = (1 to 4) × Tscl = (SJW[1..0] + 1) × Tscl
Instructions
OVRQ bit
OVFG bit
RXCDAN
TXCDAN
Section 19.8 “Error Management” on page
– Disabled mode
– Transmit mode
– Receive mode
– Automatic reply
– Frame buffer receive mode
1. The total number of Tscl (Time Quanta) in a bit time must be from 8 to 25
2. PHS2[2..0] 2 is programmable to be
Tbit
(1)
= Tsyns + Tprs + Tphs1 + Tphs2
Ident "A"
Cmd
Setting OVRQ bit
Message Data "A"
(2)
IO
≤
+ 1) × Tscl
(= 1TQ)
PHS1[2..0] and
177).
CRC
A
bit
Interframe
Resetting OVRQ bit
calculation:
≥
1
Overload Frame
Overload Frame
8209D–AVR–11/10
Ident "B"