Epson ARM.POWERED ARM720T - Manual (Page 215)

Glossary
ARM720T CORE CPU MANUAL EPSON Glossary-5
Saved Program Status Register
The Saved Program Status Register which is associated with the current
processor mode and is undefined if there is no such Saved Program Status
Register, as in User mode or System mode.
See also Program Status Register.
SBO
See Should Be One fields.
SBZ
See Should Be Zero fields.
Should Be One fields
Should be written as one (or all ones for bit fields) by software. Values other
than one produces Unpredictable results.
See also Should Be Zero fields.
Should Be Zero fields
Should be written as zero (or all 0s for bit fields) by software. Values other
than zero produce Unpredictable results.
See also Should Be One fields.
Software Interrupt Instruction
This instruction (SWI) enters Supervisor mode to request a particular
operating system function.
SPSR
See Saved Program Status Register.
Stack pointer
A register or variable pointing to the top of a stack. If the stack is full stack
the SP points to the most recently pushed item, else if the stack is empty,
the SP points to the first empty location, where the next item will be
pushed.
Status registers
See Program Status Register.
SP
See Stack pointer
SWI
See Software Interrupt Instruction.
TAP
See Test access port .