參數(shù)資料
型號： MC68HC705J1ACPE
廠商： Freescale Semiconductor
文件頁數(shù)： 110/162頁
文件大?。?/td> 0K
描述： IC MCU 4MHZ 1.2K OTP 20-DIP
標(biāo)準(zhǔn)包裝： 18
系列： HC05
核心處理器： HC05
芯體尺寸： 8-位
速度： 4MHz
外圍設(shè)備： POR，WDT
輸入/輸出數(shù)： 14
程序存儲器容量： 1.2KB（1.2K x 8）
程序存儲器類型： OTP
RAM 容量： 64 x 8
電壓 - 電源 (Vcc/Vdd)： 3 V ~ 5.5 V
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 20-DIP（0.300"，7.62mm）
包裝： 管件
Central Processor Unit (CPU)
CPU Registers
MC68HC705J1A — Rev. 4.0
Technical Data
Central Processor Unit (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 (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.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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