參數(shù)資料
型號： MC68HC705RC16P
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDIP28
封裝： PLASTIC, DIP-28
文件頁數(shù)： 48/120頁
文件大?。?/td> 547K
代理商： MC68HC705RC16P
Central Processor Unit
Condition Code Register
MC68HC705RC16 — Rev. 3.0
General Release Specification
MOTOROLA
Central Processor Unit
33
NON-DISCLOSURE
AGREEMENT
REQUIRED
3.5 Condition Code Register
The condition code register (CCR) is a 5-bit register in which four bits are
used to indicate the results of the instruction just executed, and the fifth
bit indicates whether interrupts are masked. 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.
H — Half Carry
This bit is set during ADD and ADC operations to indicate that a carry
occurred between bits 3 and 4.
I — Interrupt
When this bit is set, timer and external interrupts are masked
(disabled). If an interrupt occurs while this bit is set, the interrupt is
latched and processed as soon as the interrupt bit is cleared.
N — Negative
When set, this bit indicates that the result of the last arithmetic, logical,
or data manipulation was negative.
Z — Zero
When set, this bit indicates that the result of the last arithmetic, logical,
or data manipulation was zero.
C — Carry/Borrow
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 is also affected during bit test and branch instructions and during
shifts and rotates.
CCR
HIN
Z
C
相關(guān)PDF資料
PDF描述
MC68HC705RC16FN 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQCC44
MC68HC705T16 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDIP56
MC68HC705V8B 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDIP56
MC68HC705V8CFN 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQCC68
MC68HC705V8CFU 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQFP64
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