G-13Glossary
LSB: When used in a syntax of the MOVB instruction, LSB means least sig-
nificant byte. Otherwise, LSB means least significant bit. See least signif-
icant bit (LSB) and least significant byte (LSByte).
LSByte: See least significant byte (LSByte).
M
maskable interrupt: An interrupt that can be disabled by software so that
the CPU does not service it until it is enabled by software. See also non-
maskable interrupt.
memory interface: The buses and signals responsible for carrying commu-
nications between the core and on-chip memory/peripherals.
memory-mapped register: A register that can be accessed at addresses
in data space.
memory wrapper: The hardware around a memory block that identifies ac-
cess requests and controls accesses for that memory block.
mirror: A range of addresses that is the same size and is mapped to the
same physical memory block as another range of addresses.
most significant bit (MSB): The bit in the highest position of a binary num-
ber. For example, the MSB of a 16-bit register value is bit 15. See also
LSB, LSByte, and MSByte.
most significant byte (MSByte): The byte in the highest position of a binary
value. The MSByte of a value consists of the eight MSBs. See also
LSByte, LSB, and MSB.
MSB: When used in a syntax of the MOVB instruction, MSB means most sig-
nificant byte. Otherwise MSB means most significant bit. See most sig-
nificant bit (MSB) and most significant byte (MSByte).
MSByte: See most significant byte (MSByte).
multiplicand register (T): The primary function of this register, also called
the T register, is to hold one of the values to be multiplied during a multi-
plication. The following shift instructions use the four LSBs to hold the
shift count: ASR (arithmetic shift right), LSL (logical shift left), LSR (log-
ical shift right), and SFR (shift accumulator right). The T register can also
be used as a general-purpose 16-bit register.
Glossary
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