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PIC12F629-I/SNVAO 参数 Datasheet PDF下载

PIC12F629-I/SNVAO图片预览
型号: PIC12F629-I/SNVAO
PDF下载: 下载PDF文件 查看货源
内容描述: [RISC Microcontroller, 8-Bit, FLASH, 20MHz, CMOS, PDSO8]
分类和应用: 闪存微控制器
文件页数/大小: 136 页 / 1422 K
品牌: MICROCHIP [ MICROCHIP ]
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PIC12F629/675  
For example, a CLRF GPIOinstruction will read GPIO,  
clear all the data bits, then write the result back to  
GPIO. This example would have the unintended result  
that the condition that sets the GPIF flag would be  
cleared.  
10.0 INSTRUCTION SET SUMMARY  
The PIC12F629/675 instruction set is highly orthogonal  
and is comprised of three basic categories:  
Byte-oriented operations  
Bit-oriented operations  
TABLE 10-1: OPCODE FIELD  
DESCRIPTIONS  
Literal and control operations  
Each PIC12F629/675 instruction is a 14-bit word  
divided into an opcode, which specifies the instruction  
type, and one or more operands, which further specify  
the operation of the instruction. The formats for each of  
the categories is presented in Figure 10-1, while the  
various opcode fields are summarized in Table 10-1.  
Field  
Description  
f
Register file address (0x00 to 0x7F)  
Working register (accumulator)  
W
b
k
Bit address within an 8-bit file register  
Literal field, constant data or label  
Table 10-2 lists the instructions recognized by the  
MPASMTM assembler. A complete description of  
each instruction is also available in the PIC® Mid-  
Range Reference Manual (DS33023).  
x
Don’t care location (= 0or 1).  
The assembler will generate code with x = 0.  
It is the recommended form of use for  
compatibility with all Microchip software tools.  
For byte-oriented instructions, ‘f’ represents a file  
register designator and ‘d’ represents a destination  
designator. The file register designator specifies which  
file register is to be used by the instruction.  
d
Destination select; d = 0: store result in W,  
d = 1: store result in file register f.  
Default is d = 1.  
PC  
TO  
PD  
Program Counter  
Time-out bit  
The destination designator specifies where the result of  
the operation is to be placed. If ‘d’ is zero, the result is  
placed in the W register. If ‘d’ is one, the result is placed  
in the file register specified in the instruction.  
Power-down bit  
For bit-oriented instructions, ‘b’ represents a bit field  
designator, which selects the bit affected by the  
operation, while ‘f’ represents the address of the file in  
which the bit is located.  
FIGURE 10-1:  
GENERAL FORMAT FOR  
INSTRUCTIONS  
Byte-oriented file register operations  
13  
8
7
6
0
For literal and control operations, ‘k’ represents an 8-  
bit or 11-bit constant, or literal value.  
OPCODE  
d
f (FILE #)  
d = 0for destination W  
d = 1for destination f  
One instruction cycle consists of four oscillator periods;  
for an oscillator frequency of 4 MHz, this gives a normal  
instruction execution time of 1 s. All instructions are  
executed within a single instruction cycle, unless a  
conditional test is true, or the program counter is  
changed as a result of an instruction. When this occurs,  
the execution takes two instruction cycles, with the  
second cycle executed as a NOP.  
f = 7-bit file register address  
Bit-oriented file register operations  
13 10 9  
b (BIT #)  
7
6
0
OPCODE  
f (FILE #)  
b = 3-bit bit address  
f = 7-bit file register address  
Note: To maintain upward compatibility with  
future products, do not use the OPTION  
and TRISIOinstructions.  
Literal and control operations  
General  
All instruction examples use the format ‘0xhh’ to  
represent a hexadecimal number, where ‘h’ signifies a  
hexadecimal digit.  
13  
8
7
0
0
OPCODE  
k (literal)  
k = 8-bit immediate value  
10.1 Read-Modify-Write Operations  
CALLand GOTOinstructions only  
13 11 10  
OPCODE  
k = 11-bit immediate value  
Any instruction that specifies a file register as part of  
the instruction performs a Read-Modify-Write (R-M-W)  
operation. The register is read, the data is modified,  
and the result is stored according to either the instruc-  
tion, or the destination designator ‘d’. A read operation  
is performed on a register even if the instruction writes  
to that register.  
k (literal)  
2010 Microchip Technology Inc.  
DS41190G-page 71