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參數(shù)資料
| 型號(hào)： | HC05V7GRS |
| 英文描述： | 68HC05V7 General Release Specification |
| 中文描述： | 68HC05V7一般版本規(guī)范 |
| 文件頁(yè)數(shù)： | 41/170頁(yè) |
| 文件大?。?/td> | 980K |
| 代理商： | HC05V7GRS |
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SECTION 4: CPU CORE
MOTOROLA
Page 27
4.1.5.2
Interrupt Mask (I-Bit)
When the interrupt mask is set, the internal and external interrupts are disabled. Interrupts
are enabled when the interrupt mask is cleared. When an interrupt occurs, the interrupt
mask is automatically set after the CPU registers are saved on the stack, but before the
interrupt vector is fetched. If an interrupt request occurs while the interrupt mask is set, the
interrupt request is latched. Normally, the interrupt is processed as soon as the interrupt
mask is cleared.
A return from interrupt (RTI) instruction pulls the CPU registers from the stack, restoring the
interrupt mask to its state before the interrupt was encountered. After any reset, the
interrupt mask is set and can only be cleared by the Clear I-Bit (CLI), STOP, or WAIT
instructions.
4.1.5.3
Negative Bit (N-Bit)
The negative bit is set when the result of the last arithmetic operation, logical operation, or
data manipulation was negative. (Bit 7 of the result was a logical one.)
The negative bit can also be used to check an often-tested flag by assigning the flag to bit
7 of a register or memory location. Loading the accumulator with the contents of that
register or location then sets or clears the negative bit according to the state of the flag.
4.1.5.4
Zero Bit (Z-Bit)
The zero bit is set when the result of the last arithmetic operation, logical operation, data
manipulation, or data load operation was zero.
4.1.5.5
Carry/Borrow Bit (C-Bit)
The carry/borrow bit is set when a carry out of bit 7 of the accumulator occurred during the
last arithmetic operation, logical operation, or data manipulation. The carry/borrow bit is
also set or cleared during bit test and branch instructions and during shifts and rotates. This
bit is not set by an INC or DEC instruction.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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