收藏本站
CHAPTER 3 CPU FUNCTION
User’s Manual U15905EJ2V1UD
55
3.2.1
Program register set
The program registers include general-purpose registers and a program counter.
(1) General-purpose registers (r0 to r31)
Thirty-two general-purpose registers, r0 to r31, are available. Any of these registers can be used to store a
data variable or an address variable.
However, r0 and r30 are implicitly used by instructions and care must be exercised when these registers are
used. r0 always holds 0 and is used for an operation that uses 0 or addressing of offset 0. r30 is used by the
SLD and SST instructions as a base pointer when these instructions access the memory. r1, r3 to r5, and r31
are implicitly used by the assembler and C compiler. When using these registers, save their contents for
protection, and then restore the contents after using the registers. r2 is sometimes used by the real-time OS.
If the real-time OS does not use r2, it can be used as a register for variables.
Table 3-1. Program Registers
Name
Usage
Operation
r0
Zero register
Always holds 0.
r1
Assembler-reserved register
Used as working register to create 32-bit immediate data
r2
Register for address/data variable (if real-time OS does not use r2)
r3
Stack pointer
Used to create a stack frame when a function is called
r4
Global pointer
Used to access a global variable in the data area
r5
Text pointer
Used as register that indicates the beginning of a text area (area
where program codes are located)
r6 to r29
Register for address/data variable
r30
Element pointer
Used as base pointer to access memory
r31
Link pointer
Used when the compiler calls a function
PC
Program counter
Holds the instruction address during program execution
(2) Program counter (PC)
The program counter holds the instruction address during program execution. The lower 32 bits of this register
are valid. Bits 31 to 26 are fixed to 0. A carry from bit 25 to 26 is ignored even if it occurs.
Bit 0 is fixed to 0. This means that execution cannot branch to an odd address.
31
26 25
1 0
PC
Fixed to 0
Instruction address during program execution
0
Default value
00000000H
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
XF2L-0535-1 CONN FPC 5POS 0.5MM SMT
PIC18LF23K22-I/SS IC PIC MCU 8KB FLASH 28SSOP
PIC16LF1933-I/ML IC PIC MCU FLASH 4K 28-QFN
PIC16F1933-I/ML IC MCU 8BIT FLASH 28-QFN
PIC16F785-I/ML IC PIC MCU FLASH 2KX14 20QFN
XF2L-0425-1 CONN FPC 4POS 0.5MM SMT
PIC16F1933-I/MV IC MCU 8BIT FLASH 28-UQFN
PIC16F785-I/SO IC PIC MCU FLASH 2KX14 20SOIC
相关代理商/技术参数
PIC24F08KL302-I/SP 功能描述:16位微控制器 - MCU 8KB FLASH 1KB RAM 256B 3V RoHS:否 制造商:Texas Instruments 核心:RISC 处理器系列:MSP430FR572x 数据总线宽度:16 bit 最大时钟频率:24 MHz 程序存储器大小:8 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:2 V to 3.6 V 工作温度范围:- 40 C to + 85 C 封装 / 箱体:VQFN-40 安装风格:SMD/SMT
PIC24F08KL302-I/SS 功能描述:16位微控制器 - MCU 8KB FLASH 1KB RAM 512B 3V 10-BIT ADC RoHS:否 制造商:Texas Instruments 核心:RISC 处理器系列:MSP430FR572x 数据总线宽度:16 bit 最大时钟频率:24 MHz 程序存储器大小:8 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:2 V to 3.6 V 工作温度范围:- 40 C to + 85 C 封装 / 箱体:VQFN-40 安装风格:SMD/SMT
PIC24F08KL302T-I/ML 功能描述:16位微控制器 - MCU 8KB FLASH 1KB RAM 512B 3V 10-BIT ADC RoHS:否 制造商:Texas Instruments 核心:RISC 处理器系列:MSP430FR572x 数据总线宽度:16 bit 最大时钟频率:24 MHz 程序存储器大小:8 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:2 V to 3.6 V 工作温度范围:- 40 C to + 85 C 封装 / 箱体:VQFN-40 安装风格:SMD/SMT
PIC24F08KL302T-I/MQ 功能描述:16位微控制器 - MCU 8KB FL 1KB RAM 256B 3V RoHS:否 制造商:Texas Instruments 核心:RISC 处理器系列:MSP430FR572x 数据总线宽度:16 bit 最大时钟频率:24 MHz 程序存储器大小:8 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:2 V to 3.6 V 工作温度范围:- 40 C to + 85 C 封装 / 箱体:VQFN-40 安装风格:SMD/SMT
PIC24F08KL302T-I/SO 功能描述:16位微控制器 - MCU 8KB FLASH 1KB RAM 512B 3V 10-BIT ADC RoHS:否 制造商:Texas Instruments 核心:RISC 处理器系列:MSP430FR572x 数据总线宽度:16 bit 最大时钟频率:24 MHz 程序存储器大小:8 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:2 V to 3.6 V 工作温度范围:- 40 C to + 85 C 封装 / 箱体:VQFN-40 安装风格:SMD/SMT
PIC24F08KL302T-I/SS 功能描述:16位微控制器 - MCU 8KB FLASH 1KB RAM 512B 3V 10-BIT ADC RoHS:否 制造商:Texas Instruments 核心:RISC 处理器系列:MSP430FR572x 数据总线宽度:16 bit 最大时钟频率:24 MHz 程序存储器大小:8 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:2 V to 3.6 V 工作温度范围:- 40 C to + 85 C 封装 / 箱体:VQFN-40 安装风格:SMD/SMT
PIC24F08KL401 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Low-Power, Low-Cost, General Purpose 16-Bit Flash Microcontrollers with nanoWatt XLP Technology
PIC24F08KL401-I/MQ 功能描述:16位微控制器 - MCU 8KB FLASH 1KB RAM 512B 3V 10-BIT ADC RoHS:否 制造商:Texas Instruments 核心:RISC 处理器系列:MSP430FR572x 数据总线宽度:16 bit 最大时钟频率:24 MHz 程序存储器大小:8 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:2 V to 3.6 V 工作温度范围:- 40 C to + 85 C 封装 / 箱体:VQFN-40 安装风格:SMD/SMT