Atmel Xplained Pro Evaluation Kit for the ATSAMD21J18A Microcontroller ATSAMD21-XPRO ATSAMD21-XPRO Data Sheet
Product codes
ATSAMD21-XPRO
1002
Atmel | SMART SAM D21 [DATASHEET]
Atmel-42181C–SAM-D21_Datasheet–07/2014
40.
About This Document
40.1 Conventions
40.1.1 Numerical Notation
Table 40-1. Numerical notation
40.1.2 Memory Size and Type
40.1.3 Frequency and Time
165
Decimal number
0101b
Binary number (example 0b0101 = 5 decimal)
0101
Binary numbers are given without suffix if unambiguous
0x3B24
Hexadecimal number
X
Represents an unknown or don't care value
Z
Represents a high-impedance (floating) state for either a signal or a bus
Table 40-2. Memory Size and Bit Rate
Symbol
Description
kB/kbyte
kilobyte (2
10
= 1024)
MB/Mbyte
megabyte (2
20
= 1024*1024)
GB/Gbyte
gigabyte (2
30
= 1024*1024*1024)
b
bit (binary 0 or 1)
B
byte (8 bits)
1kbit/s
1,000 bit/s rate (not 1,024 bit/s)
1Mbit/s
1,000,000 bit/s rate
1Gbit/s
1,000,000,000 bit/s rate
Table 40-3. Frequency and Time
Symbol
Description
kHz
1kHz = 10
3
Hz = 1,000Hz
MHz
10
6
= 1,000,000Hz
GHz
10
9
= 1,000,000,000Hz
s
second
ms
millisecond
µs
microsecond
ns
nanosecond