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PIC12C508A-04/P 参数 Datasheet PDF下载

PIC12C508A-04/P图片预览
型号: PIC12C508A-04/P
PDF下载: 下载PDF文件 查看货源
内容描述: 8引脚, 8位CMOS微控制器 [8-Pin, 8-Bit CMOS Microcontrollers]
分类和应用: 微控制器和处理器外围集成电路光电二极管PC可编程只读存储器时钟
文件页数/大小: 113 页 / 1604 K
品牌: MICROCHIP [ MICROCHIP ]
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PIC12C5XX  
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. In this  
case, the execution takes two instruction cycles. One  
instruction cycle consists of four oscillator periods.  
Thus, for an oscillator frequency of 4 MHz, the normal  
instruction execution time is 1 µs. If a conditional test is  
true or the program counter is changed as a result of  
an instruction, the instruction execution time is 2 µs.  
9.0  
INSTRUCTION SET SUMMARY  
Each PIC12C5XX instruction is a 12-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 PIC12C5XX  
instruction set summary in Table 9-2 groups the  
instructions into byte-oriented, bit-oriented, and literal  
and control operations. Table 9-1 shows the opcode  
field descriptions.  
Figure 9-1 shows the three general formats that the  
instructions can have. All examples in the figure use the  
following format to represent a hexadecimal number:  
For byte-oriented instructions, ’f’ represents a file  
register designator and ’d’ represents a destination  
designator. The file register designator is used to  
specify which one of the 32 file registers is to be used  
by the instruction.  
0xhhh  
where ’h’ signifies a hexadecimal digit.  
The destination designator specifies where the result  
of the operation is to be placed. If ’d’ is ’0’, the result is  
placed in the W register. If ’d’ is ’1’, the result is placed  
in the file register specified in the instruction.  
FIGURE 9-1: GENERAL FORMAT FOR  
INSTRUCTIONS  
Byte-oriented file register operations  
11  
6
5
4
0
For bit-oriented instructions, ’b’ represents a bit field  
designator which selects the number of the bit affected  
by the operation, while ’f’ represents the number of the  
file in which the bit is located.  
OPCODE  
d
f (FILE #)  
d = 0 for destination W  
d = 1 for destination f  
f = 5-bit file register address  
Bit-oriented file register operations  
11 8 7  
b (BIT #)  
For literal and control operations, ’k’ represents an  
8 or 9-bit constant or literal value.  
5
4
0
TABLE 9-1:  
OPCODE FIELD  
DESCRIPTIONS  
OPCODE  
f (FILE #)  
b = 3-bit bit address  
f = 5-bit file register address  
Field  
Description  
f
W
b
k
Register file address (0x00 to 0x7F)  
Working register (accumulator)  
Literal and control operations (except GOTO)  
11  
8
7
0
Bit address within an 8-bit file register  
Literal field, constant data or label  
OPCODE  
k (literal)  
k = 8-bit immediate value  
Don’t care location (= 0 or 1)  
The assembler will generate code with x = 0. It is  
the recommended form of use for compatibility  
with all Microchip software tools.  
Literal and control operations - GOTOinstruction  
11 0  
x
d
9
8
OPCODE  
k (literal)  
Destination select;  
d = 0 (store result in W)  
d = 1 (store result in file register ’f’)  
Default is d = 1  
k = 9-bit immediate value  
label Label name  
TOS  
PC  
Top of Stack  
Program Counter  
Watchdog Timer Counter  
Time-Out bit  
WDT  
TO  
PD  
Power-Down bit  
Destination, either the W register or the specified  
register file location  
dest  
[ ]  
( )  
Options  
Contents  
Assigned to  
< >  
Register bit field  
In the set of  
italics  
User defined term (font is courier)  
1999 Microchip Technology Inc.  
DS40139E-page 47  
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