Search results
Results from the WOW.Com Content Network
Contained within the PSW are the two bit condition code, representing zero, positive, negative, overflow, and similar flags of other architectures' status registers. Conditional branch instructions test this encoded as a four bit value, with each bit representing a test of one of the four condition code values, 2 3 + 2 2 + 2 1 + 2 0. (Since IBM ...
A status register, flag register, or condition code register (CCR) is a collection of status flag bits for a processor.Examples of such registers include FLAGS register in the x86 architecture, flags in the program status word (PSW) register in the IBM System/360 architecture through z/Architecture, and the application program status register (APSR) in the ARM Cortex-A architecture.
code to indicate the type of interruption, inserted when the PSW is stored, during IPLoad, this is the address of the device from which the program was loaded [14] 32-33 Instruction Length Code length in halfwords or 0 if unavailable 34-35 Condition Code see individual instructions for encoding 36-39 Program Mask
Conditional move instructions write the contents of one register over another only if the predicate's value is true, whereas conditional select instructions choose which of two registers has its contents written to a third based on the predicate's value. A more generalized and capable form is full predication. Full predication has a set of ...
The high-order byte of the instruction specifies the operation. Bits 9 through 15 are the op-code, and bit 8 is the value of the condition code calculation which results in the branch being taken. The low-order byte is a signed word offset relative to the current location of the program counter. This allows for forward and reverse branches in code.
PSW may refer to: PSW Science, the oldest scientific society in Washington, D.C. Personal Support Worker, Canada; PlayStation World, a UK magazine; Program status word, a control register in IBM mainframe computers; Baillie–PSW primality test in mathematics; Part Submission Warrant in production part approval process; Post Study Work Visa, UK
When code larger than 64 KB is required, a common system makes the code bank-switched, with general-purpose I/O selecting the upper address bits. Some 8051 compilers [18] make provisions to automatically access paged code. In these systems, the interrupt vectors and paging table are placed in the first 32 KB of code and are always resident.
The California Code of Regulations (CCR, Cal. Code Regs. ) is the codification of the general and permanent rules and regulations (sometimes called administrative law ) announced in the California Regulatory Notice Register by California state agencies under authority from primary legislation in the California Codes .