PM0044 datasheet(16/162 Pages) STMICROELECTRONICS

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STM8 core description

PM0044

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Doc ID 13590 Rev 3

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I0: Interrupt mask level 0

See Flag I1

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N: Negative

When set to 1, this bit indicates that the result of the last arithmetic, logical or data

manipulation is negative (i.e. the most significant bit is a logic 1).

●

Z: Zero

When set to 1, this bit indicates that the result of the last arithmetic, logical or data

manipulation is zero.

●

C: Carry

When set, C indicates that a carry or borrow out of the ALU occurred during the last

arithmetic operation on the MSB operation result bit (bit 7 for 8-bit result/destination or

bit 15 for 16-bit result). This bit is also affected during bit test, branch, shift, rotate and

load instructions. See ADD, ADC, SUB, SBC instructions.

In bit test operations, C is the copy of the tested bit. See BTJF, BTJT instructions.

In shift and rotates operations, the carry is updated. See RRC, RLC, SRL, SLL, SRA

instructions.

This bit can be set, reset or complemented by software using SCF, RCF, CCF

instructions.

Example: Addition

$B5 + $94 = "C" + $49 = $149

The results of each instruction on the Condition Code register are shown by tables in

Section 7: STM8 instruction set. The following table is an example:

where

1011

010

1001

010

0100

100

VI1

Nothing =

Flag not affected

Flag name = Flag affected

0 =

Flag cleared

1 =

Flag set

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