參數(shù)資料
型號： MC68HC705J1Ac
廠商： 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述： Microcontrollers
中文描述： 微控制器
文件頁數(shù)： 51/162頁
文件大小： 1085K
代理商： MC68HC705J1AC
Central Processor Unit (CPU)
CPU Registers
MC68HC705J1A — Rev. 4.0
Technical Data
Central Processor Unit (CPU)
For More Information On This Product,
Go to: www.freescale.com
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 (add without carry) or ADC
(add with carry) operation. The half-carry flag is required for
binary-coded decimal (BCD) arithmetic operations.
I — Interrupt Mask Bit
Setting the interrupt mask disables interrupts. If an interrupt request
occurs while the interrupt mask is logic 0, 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 logic 1, the interrupt request is latched. Normally, the CPU
processes the latched interrupt request as soon as the interrupt mask
is cleared again.
A return-from-interrupt instruction (RTI) unstacks the CPU registers,
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 ALU operation produces a
negative result.
Z — Zero Flag
The CPU sets the zero flag when an ALU operation 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.
F
Freescale Semiconductor, Inc.
n
.
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