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MCK68HC16Z1CFC16 Datasheet(PDF) 64 Page - Freescale Semiconductor, Inc |
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MCK68HC16Z1CFC16 Datasheet(HTML) 64 Page - Freescale Semiconductor, Inc |
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64 / 500 page  CENTRAL PROCESSOR UNIT M68HC16 Z SERIES 4-4 USER’S MANUAL 4.2.5 Condition Code Register The 16-bit condition code register is composed of two functional blocks. The eight MSB, which correspond to the CCR on the M68HC11, contain the low-power stop con- trol bit and processor status flags. The eight LSB contain the interrupt priority field, the DSP saturation mode control bit, and the program counter address extension field. Figure 4-2 shows the condition code register. Detailed descriptions of each status in- dicator and field in the register follow the figure. Figure 4-2 Condition Code Register S — STOP Enable 0 = Stop clock when LPSTOP instruction is executed. 1 = Perform NOP when LPSTOP instruction is executed. MV — Accumulator M overflow flag MV is set when an overflow into AM35 has occurred. H — Half Carry Flag H is set when a carry from A3 or B3 occurs during BCD addition. EV — Accumulator M Extension Overflow Flag EV is set when an overflow into AM31 has occurred. N — Negative Flag N is set under the following conditions: • When the MSB is set in the operand of a read operation. • When the MSB is set in the result of a logic or arithmetic operation. Z — Zero Flag Z is set under the following conditions: • When all bits are zero in the operand of a read operation. • When all bits are zero in the result of a logic or arithmetic operation. V — Overflow Flag V is set when a two’s complement overflow occurs as the result of an operation. C — Carry Flag C is set when a carry or borrow occurs during an arithmetic operation. This flag is also used during shift and rotate to facilitate multiple word operations. IP[2:0] — Interrupt Priority Field The priority value in this field (0 to 7) is used to mask interrupts. 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 S MV H EV N Z V C IP[2:0] SM PK[3:0] Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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