AT90PWM3B Atmel Corporation, AT90PWM3B Datasheet - Page 199
AT90PWM3B
Manufacturer Part Number
AT90PWM3B
Description
Manufacturer
Atmel Corporation
Specifications of AT90PWM3B
Flash (kbytes)
8 Kbytes
Pin Count
32
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
# Of Touch Channels
8
Hardware Qtouch Acquisition
No
Max I/o Pins
27
Ext Interrupts
4
Usb Speed
No
Usb Interface
No
Spi
1
Uart
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
11
Adc Resolution (bits)
10
Adc Speed (ksps)
125
Analog Comparators
3
Resistive Touch Screen
No
Dac Channels
1
Dac Resolution (bits)
10
Temp. Sensor
No
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 105
I/o Supply Class
2.7 to 5.5
Operating Voltage (vcc)
2.7 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
5
Output Compare Channels
16
Input Capture Channels
1
Pwm Channels
12
32khz Rtc
No
Calibrated Rc Oscillator
Yes
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18.8.3
4317J–AVR–08/10
Asynchronous Operational Range
The operational range of the Receiver is dependent on the mismatch between the received bit
rate and the internally generated baud rate. If the Transmitter is sending frames at too fast or too
slow bit rates, or the internally generated baud rate of the Receiver does not have a similar (see
Table
bit.
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
receiver baud rate.
R
Table 18-2
that Normal Speed mode has higher toleration of baud rate variations.
Table 18-2.
F
M
slow
fast
# (Data+Parity Bit)
is the ratio of the fastest incoming data rate that can be accepted in relation to the
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
for Double Speed mode.
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.
18-2) base frequency, the Receiver will not be able to synchronize the frames to the start
M
= 5 for Double Speed mode.
10
D
5
6
7
8
9
R
and
slow
Recommended Maximum Receiver Baud Rate Error for Normal Speed Mode
(U2X = 0)
Table 18-3
=
------------------------------------------ -
S 1
–
(
R
D
+
slow
93.20
94.12
94.81
95.36
95.81
96.17
+
D S ⋅
list the maximum receiver baud rate error that can be tolerated. Note
1
(%)
)S
+
S
F
R
106.67
105.79
105.11
104.58
104.14
103.78
fast
(%)
Max Total Error (%)
+5.79/-5.88
+5.11/-5.19
+4.58/-4.54
+4.14/-4.19
+3.78/-3.83
F
+6.67/-6.8
= 8 for normal speed and S
M
AT90PWM2/3/2B/3B
= 9 for normal speed and
R
fast
=
-----------------------------------
(
D
(
+
D
1
+
)S
Recommended Max
2
Receiver Error (%)
)S
+
S
M
± 3.0
± 2.5
± 2.0
± 2.0
± 1.5
± 1.5
F
= 4
199
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