Initial Register Values - Hitachi H8/329 Series Hardware Manual

Bit 3—Negative Flag (N): This flag indicates the most significant bit (sign bit) of the result of an
instruction.
Bit 2—Zero Flag (Z): This flag is set to "1" to indicate a zero result and cleared to "0" to indicate
a nonzero result.
Bit 1—Overflow Flag (V): This flag is set to "1" when an arithmetic overflow occurs, and cleared
to "0" at other times.
Bit 0—Carry Flag (C): This flag is used by:
• Add and subtract instructions, to indicate a carry or borrow at the most significant bit of the
result
• Shift and rotate instructions, to store the value shifted out of the most significant or least
significant bit
• Bit manipulation and bit load instructions, as a bit accumulator
The LDC, STC, ANDC, ORC, and XORC instructions enable the CPU to load and store the CCR,
and to set or clear selected bits by logic operations. The N, Z, V, and C flags are used in
conditional branching instructions (B
For the action of each instruction on the flag bits, see the H8/300 Series Programming Manual.

3.2.3 Initial Register Values

When the CPU is reset, the program counter (PC) is loaded from the vector table and the interrupt
mask bit (I) in the CCR is set to "1." The other CCR bits and the general registers are not
initialized.
In particular, the stack pointer (R7) is not initialized. To prevent program crashes the stack pointer
should be initialized by software, by the first instruction executed after a reset.
).
CC
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