PIC17C752-08SLASHCL datasheet(292/328 Pages) MICROCHIP

292 / 328 page

PIC17C7XX

DS30289A-page 292

FIGURE F-2:

ALUSTA REGISTER (ADDRESS: 04h, UNBANKED)

R/W - 1

R/W - x

FS3

FS2

FS1

FS0

R = Readable bit

W = Writable bit

-n = Value at POR reset

(x = unknown)

bit7

bit0

bit 7-6:

FS3:FS2: FSR1 Mode Select bits

00 = Post auto-decrement FSR1 value

01 = Post auto-increment FSR1 value

1x = FSR1 value does not change

bit 5-4:

FS1:FS0: FSR0 Mode Select bits

00 = Post auto-decrement FSR0 value

01 = Post auto-increment FSR0 value

1x = FSR0 value does not change

bit 3:

OV: Overﬂow bit

This bit is used for signed arithmetic (2’s complement). It indicates an overﬂow of the 7-bit magnitude,

which causes the sign bit (bit7) to change state.

1 = Overﬂow occurred for signed arithmetic, (in this arithmetic operation)

0 = No overﬂow occurred

bit 2:

Z: Zero bit

1 = The result of an arithmetic or logic operation is zero

0 = The results of an arithmetic or logic operation is not zero

bit 1:

DC: Digit carry/borrow bit

For ADDWF and ADDLW instructions.

1 = A carry-out from the 4th low order bit of the result occurred

0 = No carry-out from the 4th low order bit of the result

Note: For borrow the polarity is reversed.

bit 0:

C: carry/borrow bit

For ADDWF and ADDLW instructions. Note that a subtraction is executed by adding the two’s complement

of the second operand.

For rotate (RRCF, RLCF) instructions, this bit is loaded with either the high or low order bit of the source

1 = A carry-out from the most signiﬁcant bit of the result occurred

0 = No carry-out from the most signiﬁcant bit of the result

Note: For borrow the polarity is reversed.

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