… The half-carry flag is set to 1 if an add instruction produces a carry out of the right nibble
of a register, otherwise the flag is set to O. Also, the half-carry flag is set to 1 if a subtract …

… Direction is controlled by the halfcarry flag of the µC’s status register. Encryption/decryption
is done as follows: … the CPU half-carry flag is set to 0 for encryption or to 1 for decryption; …

… For example, the half-carry flag method shown here works for an increment instruction as
we know if the four least significant bits are 0 (so reflecting the half-carry). Conversely, the four …

This paper presents an analysis of the effects and propagations of transient faults by
simulation-based fault injection into the AVR microcontroller. This analysis is done by injecting …

Here, assumption is that if we add 8 numbers from register array then it takes 120ns when
execution time is 5ns and register access time is 10ns. If we add same 8 number using one by …

… round is executed, and the half carry flag (H) in the CPU status register determines whether
encryption or decryption is performed. If the half-carry flag is set, decryption is performed and …

Description The AT90S8515 is a low-power CMOS 8-bit microcontroller based on the AVR
RISC architecture. By executing powerful instructions in a single clock cycle, the AT90S8515 …

The C programming language is a powerful, flexible and potentially portable high-level
programming language. These and other features, such as support for low-level operations, …

Figure 5 depicts the timing during an M1 (opcode fetch) cycle. The PC is placed on the
address bus at the beginning of the M1 cycle. One half clock cycle later the MREQ signal goes …