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参数资料
| 型号： | MC68HC705P6ACP |
| 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, PDIP28 |
| 封装： | PLASTIC, DIP-28 |
| 文件页数： | 65/98页 |
| 文件大小： | 532K |
| 代理商： | MC68HC705P6ACP |
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Central Processor Unit (CPU) Core
MC68HC705P6A Advance Information Data Sheet, Rev. 2.1
68
Freescale Semiconductor
12.2.2 Index Register
The index register shown in Figure 12-1 is an 8-bit register that can perform two functions:
Indexed addressing
Temporary storage
In indexed addressing with no offset, the index register contains the low byte of the operand address, and
the high byte is assumed to be $00. In indexed addressing with an 8-bit offset, the CPU finds the operand
address by adding the index register contents to an 8-bit immediate value. In indexed addressing with a
16-bit offset, the CPU finds the operand address by adding the index register contents to a 16-bit
immediate value.
The index register can also serve as an auxiliary accumulator for temporary storage. The index register
is unaffected by a reset of the device.
12.2.3 Stack Pointer
The stack pointer shown in Figure 12-1 is a 16-bit register internally. In devices with memory maps less
than 64 Kbytes, the unimplemented upper address lines are ignored. The stack pointer contains the
address of the next free location on the stack. During a reset or the reset stack pointer (RSP) instruction,
the stack pointer is set to $00FF. The stack pointer is then decremented as data is pushed onto the stack
and incremented as data is pulled from the stack.
When accessing memory, the 10 most significant bits are permanently set to 0000000011. The six least
significant register bits are appended to these 10 fixed bits to produce an address within the range of
$00FF to $00C0. Subroutines and interrupts may use up to 64 ($40) locations. If 64 locations are
exceeded, the stack pointer wraps around and writes over the previously stored information. A subroutine
call occupies two locations on the stack and an interrupt uses five locations.
12.2.4 Program Counter
The program counter shown in Figure 12-1 is a 16-bit register internally. In devices with memory maps
less than 64 Kbytes, the unimplemented upper address lines are ignored. The program counter contains
the address of the next instruction or operand to be fetched.
Normally, the address in the program counter 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.
12.2.5 Condition Code Register
The CCR shown in Figure 12-1 is a 5-bit register in which four bits are used to indicate the results of the
instruction just executed. The fifth bit is the interrupt mask. These bits can be individually tested by a
program, and specific actions can be taken as a result of their state. The condition code register should
be thought of as having three additional upper bits that are always ones. Only the interrupt mask is
affected by a reset of the device. The following paragraphs explain the functions of the lower five bits of
the condition code register.
H — Half Carry Bit
When the half-carry bit is set, it means that a carry occurred between bits 3 and 4 of the accumulator
during the last ADD or ADC (add with carry) operation. The half-carry bit is required for binary-coded
decimal (BCD) arithmetic operations.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MC68HC705P6ADW | 制造商:Rochester Electronics LLC 功能描述:MCU, 176 BYTES RAM, A/D - Bulk |
| MC68HC705P6AMDW | 功能描述:IC MCU 4.6K OTP 2.1MHZ 28-SOIC RoHS:否 类别:集成电路 (IC) >> 嵌入式 - 微控制器， 系列:HC05 标准包装:250 系列:56F8xxx 核心处理器:56800E 芯体尺寸:16-位 速度:60MHz 连通性:CAN，SCI，SPI 外围设备:POR，PWM，温度传感器，WDT 输入/输出数:21 程序存储器容量:40KB（20K x 16） 程序存储器类型:闪存 EEPROM 大小:- RAM 容量:6K x 16 电压 - 电源 (Vcc/Vdd):2.25 V ~ 3.6 V 数据转换器:A/D 6x12b 振荡器型:内部 工作温度:-40°C ~ 125°C 封装/外壳:48-LQFP 包装:托盘 配用:MC56F8323EVME-ND - BOARD EVALUATION MC56F8323 |
| MC68HC705P6AMP | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MC68HC705P6CDW | 制造商:Motorola Inc 功能描述: |
| MC68HC705P6CP | 制造商:Freescale Semiconductor 功能描述: 制造商:Motorola Inc 功能描述: |
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