GMS81508A データシートの表示（PDF） - Hynix Semiconductor

部品番号

コンポーネント説明

メーカー

GMS81508A

USER’S MANUAL

Hynix Semiconductor 

GMS81508/16

 Break Flag ( B )

This flag is set by BRK (S/W interrupt) instruction to distinguish BRK and TCALL instruction having

the same vector address.

 Direct Page Flag ( G )

This flag assign direct page (0-page, 1-page) for direct addressing mode. When G-flag is "0", the

direct addressing space is in 0-page(0000H~00FFH). When G-flag is "1", the direct addressing

space is in 1-page(0100H~01FFH).

It is set and cleared by SETG, CLRG instruction

 Overflow Flag ( V )

This flag functions when one word is added or subtracted in binary with the sign. When results

exceeds +127 or -128, this flag is set.

When BIT instruction is executed, The bit6 of memory is input into V-flag.

This flag is cleared by CLRV instruction, but set instruction is not exist.

It is a branch condition flag of BVS, BVC.

 Negative Flag ( N )

N-flag is set when the result of a data transfer or operation is negative (bit7 is “1”).

it means the bit-7 of memory is sign bit. thereby data is valid in the range of -128 ~ +127.

When BIT instruction is executed, The bit7 of memory is input into N-flag.

Set or clear instruction is not exist.

It is a branch condition flag of BPL, BMI instruction.

11

Share Link: