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| 型号： | MC68HC705J2CP |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDIP20 |
| 封装： | PLASTIC, DIP-20 |
| 文件页数： | 18/82页 |
| 文件大小： | 2545K |
| 代理商： | MC68HC705J2CP |
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CENTRAL PROCESSOR UNIT
Rev. 2
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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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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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相关代理商/技术参数 |
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| MC68HC705J2DW | 制造商:Motorola Inc 功能描述: |
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| MC68HC705JJ7CDW | 功能描述:IC MCU 8BIT 20-SOIC RoHS:否 类别:集成电路 (IC) >> 嵌入式 - 微控制器， 系列:HC05 其它有关文件:STM32F101T8 View All Specifications 特色产品:STM32 32-bit Cortex MCUs 标准包装:490 系列:STM32 F1 核心处理器:ARM? Cortex?-M3 芯体尺寸:32-位 速度:36MHz 连通性:I²C，IrDA，LIN，SPI，UART/USART 外围设备:DMA，PDR，POR，PVD，PWM，温度传感器，WDT 输入/输出数:26 程序存储器容量:64KB（64K x 8） 程序存储器类型:闪存 EEPROM 大小:- RAM 容量:10K x 8 电压 - 电源 (Vcc/Vdd):2 V ~ 3.6 V 数据转换器:A/D 10x12b 振荡器型:内部 工作温度:-40°C ~ 85°C 封装/外壳:36-VFQFN，36-VFQFPN 包装:托盘 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... 其它名称:497-9032STM32F101T8U6-ND |
| MC68HC705JP7CDW | 功能描述:IC MCU 8BIT 28-SOIC RoHS:否 类别:集成电路 (IC) >> 嵌入式 - 微控制器， 系列:HC05 其它有关文件:STM32F101T8 View All Specifications 特色产品:STM32 32-bit Cortex MCUs 标准包装:490 系列:STM32 F1 核心处理器:ARM? Cortex?-M3 芯体尺寸:32-位 速度:36MHz 连通性:I²C，IrDA，LIN，SPI，UART/USART 外围设备:DMA，PDR，POR，PVD，PWM，温度传感器，WDT 输入/输出数:26 程序存储器容量:64KB（64K x 8） 程序存储器类型:闪存 EEPROM 大小:- RAM 容量:10K x 8 电压 - 电源 (Vcc/Vdd):2 V ~ 3.6 V 数据转换器:A/D 10x12b 振荡器型:内部 工作温度:-40°C ~ 85°C 封装/外壳:36-VFQFN，36-VFQFPN 包装:托盘 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... 其它名称:497-9032STM32F101T8U6-ND |
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