ATmega328P Automotive Atmel Corporation, ATmega328P Automotive Datasheet - Page 184

• Manufacturer Part Number: ATmega328P Automotive
• Manufacturer: Atmel Corporation

Specifications of ATmega328P Automotive

• Flash (kbytes): 32 Kbytes
• Pin Count: 32
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 23
• Ext Interrupts: 24
• Usb Speed: No
• Usb Interface: No
• Spi: 2
• Twi (i2c): 1
• Uart: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 2
• Eeprom (bytes): 1024
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: Yes
• Temp. Range (deg C): -40 to 125
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 3
• Output Compare Channels: 6
• Input Capture Channels: 1
• Pwm Channels: 6
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

184
ATmega328P [Preliminary]
The following equations can be used to calculate the ratio of the incoming data rate and internal
receiver baud rate.
D
S
S
S
R
Table 19-2 on page 184
that can be tolerated. Note that Normal Speed mode has higher toleration of baud rate
variations.
Table 19-2.
F
M
slow
# (Data+Parity Bit)
10
D
5
6
7
8
9
R
slow
Sum of character size and parity size (D = 5 to 10 bit)
Samples per bit. S = 16 for Normal Speed mode and S = 8 for Double Speed
mode.
First sample number used for majority voting. S
S
Middle sample number used for majority voting. S
S
is the ratio of the slowest incoming data rate that can be accepted in relation to
the receiver baud rate. R
be accepted in relation to the receiver baud rate.
Recommended Maximum Receiver Baud Rate Error for Normal Speed Mode
(U2Xn = 0)
F
M
=
= 4 for Double Speed mode.
= 5 for Double Speed mode.
---------------------------------------------
S 1
–
R
+
D
and
slow
93.20
94.12
94.81
95.36
95.81
96.17
D
+
1
Table 19-3 on page 185
(%)
S
S
+
S
F
R
106.67
105.79
105.11
104.58
104.14
103.78
fast
fast
(%)
is the ratio of the fastest incoming data rate that can
Max Total Error (%)
+5.79/-5.88
+5.11/-5.19
+4.58/-4.54
+4.14/-4.19
+3.78/-3.83
+6.67/-6.8
list the maximum receiver baud rate error
R
F
fast
= 8 for normal speed and
M
= 9 for normal speed and
=
-----------------------------------
D
+
D
Recommended Max
1
Receiver Error (%)
+
S
2
+
S
S
± 3.0
± 2.5
± 2.0
± 2.0
± 1.5
± 1.5
M
7810A–AVR–11/09