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CS80C286-16 Datasheet(PDF) 8 Page - Intersil Corporation |
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CS80C286-16 Datasheet(HTML) 8 Page - Intersil Corporation |
8 / 60 page 8 TABLE 1. FLAGS WORD BIT FUNCTIONS BIT POSITION NAME FUNCTION 0 CF Carry Flag - Set on high-order bit carry or borrow; cleared otherwise. 2 PF Parity Flag - Set if low-order 8 bits of result contain an even number of 1 bits; cleared otherwise. 4 AF Set on carry from or borrow to the low order four bits of AL; cleared otherwise. 6 ZF Zero Flag - Set if result is zero; cleared otherwise. 7 SF Sign Flag - Set equal to high-order bit of result (0 if positive, 1 if negative). 11 OF Overflow Flag - Set if result is a too-large positive number or a too-small negative number (excluding sign-bit) to fit in destination operand; cleared otherwise. 8 TF Single Step Flag - Once set, a single step interrupt occurs after the next instruction executes. TF is cleared by the single step interrupt. 9 IF Interrupt-Enable Flag - When set, maskable interrupts will cause the CPU to transfer control to an inter- rupt vector specified location. 10 DF Direction Flag - Causes string instructions to auto decrement the appropriate index registers when set. Clearing DF causes auto increment. CONTROL FLAGS: TRAP FLAG INTERRUPT ENABLE DIRECTION FLAG SPECIAL FIELDS: I/O PRIVILEGE LEVEL NESTED TASK FLAG TS EM MP PE CF PF AF ZF SF TF IF DF OF IOPL NT FLAGS: 14 15 13 12 11 10 9 8 7 6 5 4 3 2 1 0 0 1 2 3 15 OVERFLOW SIGN ZERO AUXILIARY CARRY PARITY CARRY STATUS FLAGS: MSW: RESERVED TASK SWITCH PROCESSOR EXTENSION EMULATED MONITOR PROCESSOR EXTENSION PROTECTION ENABLE FIGURE 2. STATUS AND CONTROL REGISTER BIT FUNCTIONS 80C286 |
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