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參數(shù)資料
| 型號(hào)： | MC68HC05E5DW |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類(lèi)： | 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(yè)數(shù)： | 63/140頁(yè) |
| 文件大?。?/td> | 847K |
| 代理商： | MC68HC05E5DW |
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Central Processing Unit (CPU)
Condition Code Register
MC68HC05E5 — Rev. 1.0
General Release Specification
MOTOROLA
Central Processing Unit (CPU)
29
NON-DISCLOSURE
AGREEMENT
REQUIRED
3.5 Condition Code Register
The CCR is a 5-bit register in which the H, N, Z, and C bits are used to
indicate the results of the instruction just executed, and the I bit is used
to enable interrupts. These bits can be tested individually by a program,
and specific actions can be taken as a result of their state. Each bit is
explained in the following paragraphs.
Half Carry (H)
This bit is set during ADD and ADC operations to indicate that a carry
occurred between bits 3 and 4.
Interrupt (I)
When this bit is set, the timer and external interrupt are masked
(disabled). If an interrupt occurs while this bit is set, the interrupt is
latched and processed as soon as the I bit is cleared.
Negative (N)
When set, this bit indicates that the result of the last arithmetic, logical,
or data manipulation was negative.
Zero (Z)
When set, this bit indicates that the result of the last arithmetic, logical,
or data manipulation was zero.
Carry/Borrow (C)
When set, this bit indicates that a carry or borrow out of the arithmetic
logical unit (ALU) occurred during the last arithmetic operation. This
bit also is affected during bit test and branch instructions and during
shifts and rotates.
Bit 4
3
2
1
Bit 0
HIN
Z
C
Figure 3-5. Condition Code Register (CCR)
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC68HC05E5P | 制造商:FREESCALE 制造商全稱(chēng):Freescale Semiconductor, Inc 功能描述:General Release Specification |
| MC68HC05E6 | 制造商:FREESCALE 制造商全稱(chēng):Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit |
| MC68HC05E6CDW | 制造商:FREESCALE 制造商全稱(chēng):Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit |
| MC68HC05E6CFB | 制造商:FREESCALE 制造商全稱(chēng):Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit |
| MC68HC05E6DW | 制造商:FREESCALE 制造商全稱(chēng):Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit |
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