p2125vps20 Renesas Electronics Corporation., p2125vps20 Datasheet - Page 67

• Manufacturer Part Number: p2125vps20
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

2.4.5
Reset exception handling loads the CPU's program counter (PC) from the vector table, clears the
trace (T) bit in EXR to 0, and sets the interrupt mask (I) bits in CCR and EXR to 1. The other
CCR bits and the general registers are not initialized. Note that the stack pointer (ER7) is
undefined. The stack pointer should therefore be initialized by an MOV.L instruction executed
immediately after a reset.
Bit
1
0
Bit Name
V
C
Initial Register Values
Initial
Value
Undefined
Undefined
R/W
R/W
R/W
Description
Overflow Flag
Set to 1 when an arithmetic overflow occurs, and cleared to
0 otherwise.
Carry Flag
Set to 1 when a carry occurs, and cleared to 0 otherwise.
Used by:
•
•
•
The carry flag is also used as a bit accumulator by bit
manipulation instructions.
Add instructions, to indicate a carry
Subtract instructions, to indicate a borrow
Shift and rotate instructions, to indicate a carry
Rev. 1.00 Sep. 21, 2006 Page 29 of 658
REJ09B0310-0100
Section 2 CPU