TC1767
Introduction
register names contain a module name prefix, separated by an underscore character
“_” from the actual register name (for example, “ASC0_CON”, where “ASC0” is the
module name prefix, and “CON” is the kernel register name). In chapters describing
the kernels of the peripheral modules, the registers are mainly referenced with their
kernel register names. The peripheral module implementation sections mainly refer
to the actual register names with module prefixes.
• Variables used to describe sets of processing units or registers appear in mixed
upper and lower cases. For example, register name “MSGCFGn” refers to multiple
“MSGCFG” registers with variable n. The bounds of the variables are always given
where the register expression is first used (for example, “n = 0-31”), and are repeated
as needed in the rest of the text.
• The default radix is decimal. Hexadecimal constants are suffixed with a subscript
letter “H”, as in 100H. Binary constants are suffixed with a subscript letter “B”, as in:
111B.
• When the extent of register fields, groups register bits, or groups of pins are
collectively named in the body of the document, they are represented as
“NAME[A:B]”, which defines a range for the named group from B to A. Individual bits,
signals, or pins are given as “NAME[C]” where the range of the variable C is given in
the text. For example: CFG[2:0] and SRPN[0].
• Units are abbreviated as follows:
– MHz = Megahertz
– µs = Microseconds
– kBaud, kbit = 1000 characters/bits per second
– MBaud, Mbit = 1,000,000 characters/bits per second
– Kbyte, KB = 1024 bytes of memory
– Mbyte, MB = 1048576 bytes of memory
In general, the k prefix scales a unit by 1000 whereas the K prefix scales a unit by
1024. Hence, the Kbyte unit scales the expression preceding it by 1024. The
kBaud unit scales the expression preceding it by 1000. The M prefix scales by
1,000,000 or 1048576, and µ scales by .000001. For example, 1 Kbyte is
1024 bytes, 1 Mbyte is 1024 × 1024 bytes, 1 kBaud/kbit are 1000 characters/bits
per second, 1 MBaud/Mbit are 1000000 characters/bits per second, and 1 MHz is
1,000,000 Hz.
• Data format quantities are defined as follows:
– Byte = 8-bit quantity
– Half-word = 16-bit quantity
– Word = 32-bit quantity
– Double-word = 64-bit quantity
Data Sheet
8
V1.3, 2009-09
INFINEON [ Infineon ]
