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Bit 5—Half-Carry Flag (H):

When the ADD.B, ADDX.B, SUB.B, SUBX.B, CMP.B, or NEG.B

instruction is executed, this flag is set to 1 if there is a carry or borrow at bit 3, and cleared to 0

otherwise. When the ADD.W, SUB.W, CMP.W, or NEG.W instruction is executed, the H flag is

set to 1 if there is a carry or borrow at bit 11, and cleared to 0 otherwise. When the ADD.L,

SUB.L, CMP.L, or NEG.L instruction is executed, the H flag is set to 1 if there is a carry or

borrow at bit 27, and cleared to 0 otherwise.

Bit 4—User Bit (U):

Can be written and read by software using the LDC, STC, ANDC, ORC,

and XORC instructions.

Bit 3—Negative Flag (N):

Indicates the most significant bit (sign bit) of data.

Bit 2—Zero Flag (Z):

Set to 1 to indicate zero data, and cleared to 0 to indicate non-zero data.

Bit 1—Overflow Flag (V):

Set to 1 when an arithmetic overflow occurs, and cleared to 0 at other

Bit 0—Carry Flag (C):

Set to 1 when a carry occurs, and cleared to 0 otherwise. Used by:

Add instructions, to indicate a carry

Subtract instructions, to indicate a borrow

Shift and rotate instructions, to store the value shifted out of the end bit

The carry flag is also used as a bit accumulator by bit manipulation instructions.

Some instructions leave flag bits unchanged. Operations can be performed on CCR by the LDC,

STC, ANDC, ORC, and XORC instructions. The N, Z, V, and C flags are used by conditional

branch (Bcc) instructions.

For the action of each instruction on the flag bits, see appendix A.1, Instruction List. For the I and

UI bits, see section 5, Interrupt Controller.

2.4.4 Initial CPU Register Values

In reset exception handling, PC is initialized to a value loaded from the vector table, and the I bit

in CCR is set to 1. The other CCR bits and the general registers are not initialized. In particular,

the stack pointer (ER7) is not initialized. The stack pointer must therefore be initialized by an

MOV.L instruction executed immediately after a reset.

相關(guān)PDF資料	PDF描述
HD6433048	Hitachi Single-Chip Microcomputer
HD64F3642A	H8/3644 Series Hardware Manual
HD6473644	H8/3644 Series Hardware Manual
HD64F3643	H8/3644 Series Hardware Manual
HD64F3644	H8/3644 Series Hardware Manual

相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
HD6433047F	制造商:未知廠家制造商全稱:未知廠家功能描述:32-Bit Microcontroller
HD6433047SA18FV	制造商:Renesas Electronics Corporation 功能描述:
HD6433047TF	制造商:未知廠家制造商全稱:未知廠家功能描述:32-Bit Microcontroller
HD6433047VF	制造商:未知廠家制造商全稱:未知廠家功能描述:32-Bit Microcontroller
HD6433047VTF	制造商:未知廠家制造商全稱:未知廠家功能描述:32-Bit Microcontroller

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