DR805X Datasheet, PDF(17/79 Page) Digital Core Design – 8-bit RISC Microcontroller Instructions set details ver 3.10

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DR805X Datasheet, PDF (17/79 Pages) Digital Core Design – 8-bit RISC Microcontroller Instructions set details ver 3.10

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DR805x Instructions set details

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3.3. ADDC

Instruction: ADDC A, < src-byte>

Function:

Adds A and the source operand, then adds one (1) if CY is set, and

puts the result in A.

Description:

ADDC simultaneously adds the byte variable indicated, the carry flag

and the accumulator contents, leaving the result in the accumulator.

The carry and auxiliary carry flags are set, respectively, if there is a

carry out of bit 7 or bit 3, and cleared otherwise. When adding unsigned

integers, the carry flag indicates an overflow occurred. OV is set if there

is a carry out of bit 6 but not out of bit 7, or a carry out of bit 7 but not

out of bit 6; otherwise OV is cleared. When adding signed integers, OV

indicates a negative number produced as the sum of two positive

operands or a positive sum from two negative operands. Four source

operand-addressing modes are allowed: register= direct, register-

indirect, or immediate.

3.3.1. ADDC A, RN

Operation: (PC) â (PC) + 1

(A) â (A) + (C) + (Rn)

Bytes:

Cycles:

Encoding:

00111 r r r

3.3.2. ADDC A, DIRECT

Operation: (PC) â (PC) + 2

(A) â (A) + (C) + (direct)

Bytes:

Cycles:

Encoding:

00110101

direct address

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