參數(shù)資料
型號: MC68HC05P9AVDW
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封裝: SOIC-28
文件頁數(shù): 86/158頁
文件大?。?/td> 3885K
代理商: MC68HC05P9AVDW
CPU
CPU Registers
CPU
H — Half-Carry Flag
The CPU sets the half-carry flag when a carry occurs between bits 3
and 4 of the accumulator during an ADD or ADC operation. The
half-carry flag is required for binary-coded decimal (BCD) arithmetic
operations.
I — Interrupt Mask
Setting the interrupt mask disables interrupts. If an interrupt request
occurs while the interrupt mask is logic zero, the CPU saves the CPU
registers on the stack, sets the interrupt mask, and then fetches the
interrupt vector. If an interrupt request occurs while the interrupt mask
is set, the interrupt request is latched. Normally, the CPU processes
the latched interrupt as soon as the interrupt mask is cleared again.
A return from interrupt (RTI) instruction pulls the CPU registers from
the stack, restoring the interrupt mask to its cleared state. After any
reset, the interrupt mask is set and can be cleared only by a software
instruction.
N — Negative Flag
The CPU sets the negative flag when an arithmetic operation, logical
operation, or data manipulation produces a negative result.
Z — Zero Flag
The CPU sets the zero flag when an arithmetic operation, logical
operation, or data manipulation produces a result of $00.
C — Carry/Borrow Flag
The CPU sets the carry/borrow flag when an addition operation
produces a carry out of bit 7 of the accumulator or when a subtraction
operation requires a borrow. Some logical operations and data
manipulation instructions also clear or set the carry/borrow flag.
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For More Information On This Product,
Go to: www.freescale.com
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