HD64F2145 datasheet(77/829 Pages) RENESAS

77 / 829 page

Rev. 2.0, 08/02, page 37 of 788

Bit

Bit Name

Initial Value

R/W Description

R/W Interrupt Mask Bit

Masks interrupts other than NMI when set to 1. NMI is

accepted regardless of the I bit setting. The I bit is set to 1

at the start of an exception-handling sequence. For details,

refer to section 5, Interrupt Controller.

Undefined

R/W User Bit or Interrupt Mask Bit

Can be written to and read from by software using the

LDC, STC, ANDC, ORC, and XORC instructions.

Undefined

R/W Half-Carry Flag

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.

Undefined

R/W User Bit

Can be written to and read from by software using the

LDC, STC, ANDC, ORC, and XORC instructions.

Undefined

R/W Negative Flag

Stores the value of the most significant bit of data as a sign

bit.

Undefined

R/W Zero Flag

Set to 1 to indicate zero data, and cleared to 0 to indicate

non-zero data.

Undefined

R/W Overflow Flag

Set to 1 when an arithmetic overflow occurs, and cleared to

0 otherwise.

Undefined

R/W Carry Flag

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 indicate a carry

The carry flag is also used as a bit accumulator by bit

manipulation instructions.

HD64F2145 датащи(PDF) 77 Page - Renesas Technology Corp

HD64F2145 датащи(HTML) 77 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

датащи скачать

ссылки URL