參數(shù)資料
型號(hào): PIC12F635T-E/SN
元件分類: 微控制器/微處理器
英文描述: 8-BIT, FLASH, 20 MHz, RISC MICROCONTROLLER, PDSO8
封裝: 0.150 INCH, PLASTIC, MS-012, SOIC-8
文件頁(yè)數(shù): 118/196頁(yè)
文件大?。?/td> 3291K
代理商: PIC12F635T-E/SN
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PIC12F635/PIC16F636/639
DS41232B-page 26
Preliminary
2005 Microchip Technology Inc.
2.3
PCL and PCLATH
The Program Counter (PC) is 13 bits wide. The low byte
comes from the PCL register, which is a readable and
writable register. The high byte (PC<12:8>) is not
directly readable or writable and comes from PCLATH.
On any Reset, the PC is cleared. Figure 2-5 shows the
two situations for the loading of the PC. The upper
example in Figure 2-5 shows how the PC is loaded on a
write to PCL (PCLATH<4:0>
→ PCH). The lower
example in Figure 2-5 shows how the PC is loaded
during a CALL or GOTO instruction (PCLATH<4:3>
PCH).
FIGURE 2-5:
LOADING OF PC IN
DIFFERENT SITUATIONS
2.3.1
COMPUTED GOTO
A computed GOTO is accomplished by adding an offset
to the program counter (ADDWF
PCL
). When
performing a table read using a computed GOTO
method, care should be exercised if the table location
crosses a PCL memory boundary (each 256-byte
block).
Refer
to
the
Application
Note
AN556,
“Implementing a Table Read” (DS00556).
2.3.2
STACK
The PIC12F635/PIC16F636/639 family has an 8-
level x 13-bit wide hardware stack (see Figure 2-1).
The stack space is not part of either program or data
space and the Stack Pointer is not readable or writable.
The PC is PUSHed onto the stack when a CALL
instruction is executed or an interrupt causes a branch.
The stack is POPed in the event of a RETURN, RETLW
or a RETFIE instruction execution. PCLATH is not
affected by a PUSH or POP operation.
The stack operates as a circular buffer. This means that
after the stack has been PUSHed eight times, the ninth
push overwrites the value that was stored from the first
push. The tenth push overwrites the second push (and
so on).
PC
12
8
7
0
5
PCLATH<4:0>
PCLATH
Instruction with
ALU Result
GOTO
, CALL
Opcode<10:0>
8
PC
12
11 10
0
11
PCLATH<4:3>
PCH
PCL
87
2
PCLATH
PCH
PCL
PCL as
Destination
Note 1: There are no Status bits to indicate stack
overflow or stack underflow conditions.
2: There are no instructions/mnemonics
called PUSH or POP. These are actions
that occur from the execution of the CALL,
RETURN
, RETLW and RETFIE instructions
or the vectoring to an interrupt address.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PIC12F635T-I/MD 功能描述:8位微控制器 -MCU 2 KB 64 RAM 6I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
PIC12F635TI/MF 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:8/14-PIN FLASH-BASED, 8-BIT CMOS MICROCONTROLLERS WITH NANOWATT TECHNOLOGY
PIC12F635T-I/MF 功能描述:8位微控制器 -MCU 2kb 64 RAM 6 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
PIC12F635TI/MFQTP 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:8/14-PIN FLASH-BASED, 8-BIT CMOS MICROCONTROLLERS WITH NANOWATT TECHNOLOGY
PIC12F635TI/P 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:8/14-PIN FLASH-BASED, 8-BIT CMOS MICROCONTROLLERS WITH NANOWATT TECHNOLOGY