h8s-2158 Renesas Electronics Corporation., h8s-2158 Datasheet - Page 81

• Manufacturer Part Number: h8s-2158
• Description: Renesas 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. 3.00 Jan 25, 2006 page 29 of 872
REJ09B0286-0300
Section 2 CPU