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參數(shù)資料
| 型號： | MC68HC705J2DW |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | HCMOS MICROCONTROLLER UNIT |
| 中文描述： | 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO20 |
| 封裝： | SOIC-20 |
| 文件頁數(shù)： | 25/82頁 |
| 文件大?。?/td> | 327K |
| 代理商： | MC68HC705J2DW |
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MC68HC705J2
Rev. 2
CENTRAL PROCESSOR UNIT
MOTOROLA
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4.1.4 Program Counter
The program counter is a 16-bit register that contains the address of the next
instruction or operand to be fetched. The four most significant bits of the program
counter are permanently fixed at 0000. In MC68HC05J1 emulation mode, the five
most significant bits are fixed at 00000.
Normally, the address in the program counter automatically increments to the next
sequential memory location every time an instruction or operand is fetched. Jump,
branch, and interrupt operations load the program counter with an address other than
that of the next sequential location.
4.1.5 Condition Code Register
The condition code register is an 8-bit register whose three most significant bits are
permanently fixed at 111. The condition code register contains the interrupt mask
and four flags that indicate the results of the instruction just executed. The following
paragraphs describe the functions of the condition code register.
4.1.5.1 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.
4.1.5.2 Interrupt Mask
Setting the interrupt mask disables interrupts. If an interrupt request occurs while the
interrupt mask is 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.
4.1.5.3 Negative Flag
The CPU sets the negative flag when an arithmetic operation, logical operation, or
data manipulation produces a negative result. Bit 7 of the negative result is
automatically set, so the negative flag can be used to check an often-tested bit by
assigning it to bit 7 of a register or memory location. Loading the accumulator with
the contents of that register or location then sets or clears the negative flag according
to the state of the tested bit.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MC68HC705J5ACP | 制造商:Motorola Inc 功能描述: 制造商:MOTOROLA 功能描述: |
| MC68HC705JB4DW | 制造商:Motorola Inc 功能描述: 制造商:MOTOROLA 功能描述: |
| MC68HC705JJ7CDW | 功能描述:IC MCU 8BIT 20-SOIC RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:HC05 其它有關文件:STM32F101T8 View All Specifications 特色產(chǎn)品:STM32 32-bit Cortex MCUs 標準包裝:490 系列:STM32 F1 核心處理器:ARM? Cortex?-M3 芯體尺寸:32-位 速度:36MHz 連通性:I²C，IrDA，LIN，SPI，UART/USART 外圍設備:DMA，PDR，POR，PVD，PWM，溫度傳感器，WDT 輸入/輸出數(shù):26 程序存儲器容量:64KB（64K x 8） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:10K x 8 電壓 - 電源 (Vcc/Vdd):2 V ~ 3.6 V 數(shù)據(jù)轉換器:A/D 10x12b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:36-VFQFN，36-VFQFPN 包裝:托盤 配用:497-10030-ND - STARTER KIT FOR STM32497-8853-ND - BOARD DEMO STM32 UNIV USB-UUSCIKSDKSTM32-PL-ND - KIT IAR KICKSTART STM32 CORTEXM3497-8512-ND - KIT STARTER FOR STM32F10XE MCU497-8505-ND - KIT STARTER FOR STM32F10XE MCU497-8304-ND - KIT STM32 MOTOR DRIVER BLDC497-6438-ND - BOARD EVALUTION FOR STM32 512K497-6289-ND - KIT PERFORMANCE STICK FOR STM32MCBSTM32UME-ND - BOARD EVAL MCBSTM32 + ULINK-MEMCBSTM32U-ND - BOARD EVAL MCBSTM32 + ULINK2更多... 其它名稱:497-9032STM32F101T8U6-ND |
| MC68HC705JP7CDW | 功能描述:IC MCU 8BIT 28-SOIC RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:HC05 其它有關文件:STM32F101T8 View All Specifications 特色產(chǎn)品:STM32 32-bit Cortex MCUs 標準包裝:490 系列:STM32 F1 核心處理器:ARM? Cortex?-M3 芯體尺寸:32-位 速度:36MHz 連通性:I²C，IrDA，LIN，SPI，UART/USART 外圍設備:DMA，PDR，POR，PVD，PWM，溫度傳感器，WDT 輸入/輸出數(shù):26 程序存儲器容量:64KB（64K x 8） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:10K x 8 電壓 - 電源 (Vcc/Vdd):2 V ~ 3.6 V 數(shù)據(jù)轉換器:A/D 10x12b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:36-VFQFN，36-VFQFPN 包裝:托盤 配用:497-10030-ND - STARTER KIT FOR STM32497-8853-ND - BOARD DEMO STM32 UNIV USB-UUSCIKSDKSTM32-PL-ND - KIT IAR KICKSTART STM32 CORTEXM3497-8512-ND - KIT STARTER FOR STM32F10XE MCU497-8505-ND - KIT STARTER FOR STM32F10XE MCU497-8304-ND - KIT STM32 MOTOR DRIVER BLDC497-6438-ND - BOARD EVALUTION FOR STM32 512K497-6289-ND - KIT PERFORMANCE STICK FOR STM32MCBSTM32UME-ND - BOARD EVAL MCBSTM32 + ULINK-MEMCBSTM32U-ND - BOARD EVAL MCBSTM32 + ULINK2更多... 其它名稱:497-9032STM32F101T8U6-ND |
| MC68HC705JP7CP | 制造商:Rochester Electronics LLC 功能描述: 制造商:Freescale Semiconductor 功能描述: |
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