參數(shù)資料
型號: PIC12F683-I/P
廠商: Microchip Technology
文件頁數(shù): 88/176頁
文件大?。?/td> 0K
描述: IC MCU FLASH 2KX14 8DIP
產(chǎn)品培訓模塊: Asynchronous Stimulus
8-bit PIC® Microcontroller Portfolio
Digi-Key 應用說明: AN0005 PWM Example with Microchip's CCP Module
AN0005 Example Code
標準包裝: 60
系列: PIC® 12F
核心處理器: PIC
芯體尺寸: 8-位
速度: 20MHz
外圍設備: 欠壓檢測/復位,POR,PWM,WDT
輸入/輸出數(shù): 5
程序存儲器容量: 3.5KB(2K x 14)
程序存儲器類型: 閃存
EEPROM 大小: 256 x 8
RAM 容量: 128 x 8
電壓 - 電源 (Vcc/Vdd): 2 V ~ 5.5 V
數(shù)據(jù)轉換器: A/D 4x10b
振蕩器型: 內部
工作溫度: -40°C ~ 85°C
封裝/外殼: 8-DIP(0.300",7.62mm)
包裝: 管件
產(chǎn)品目錄頁面: 645 (CN2011-ZH PDF)
配用: DM163029-ND - BOARD PICDEM FOR MECHATRONICS
AC162058-ND - HEADER MPLAB ICD2 FOR PIC12F683
I3-DB12F683-ND - BOARD DAUGHTER ICEPIC3
ACICE0201-ND - MPLABICE 8P 300 MIL ADAPTER
AC124001-ND - MODULE SKT PROMATEII 8DIP/SOIC
2007 Microchip Technology Inc.
DS41211D-page 17
PIC12F683
3.3
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 3-3 shows the
two situations for the loading of the PC. The upper
example in Figure 3-3 shows how the PC is loaded on a
write to PCL (PCLATH<4:0>
→ PCH). The lower exam-
ple in Figure 3-3 shows how the PC is loaded during a
CALL
or GOTO instruction (PCLATH<4:3>
→ PCH).
FIGURE 3-3:
LOADING OF PC IN
DIFFERENT SITUATIONS
3.3.1
COMPUTED GOTO
A computed GOTO is accomplished by adding an offset
to the program counter (ADDWF PCL). When perform-
ing 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).
3.3.2
STACK
The PIC12F683 family has an 8-level x 13-bit wide
hardware stack (see Figure 3-1). 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).
3.4
Indirect Addressing, INDF and
FSR Registers
The INDF register is not a physical register. Addressing
the INDF register will cause indirect addressing.
Indirect addressing is possible by using the INDF
register. Any instruction using the INDF register
actually accesses data pointed to by the File Select
Register (FSR). Reading INDF itself indirectly will
produce 00h. Writing to the INDF register indirectly
results in a no operation (although Status bits may be
affected). An effective 9-bit address is obtained by
concatenating the 8-bit FSR register and the IRP bit of
the STATUS register, as shown in Figure 3-4.
A simple program to clear RAM location 20h-2Fh using
indirect addressing is shown in Example 3-1.
EXAMPLE 3-1:
INDIRECT ADDRESSING
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.
MOVLW
0x20
;initialize pointer
MOVWF
FSR
;to RAM
NEXT
CLRF
INDF
;clear INDF register
INCF
FSR
;inc pointer
BTFSS
FSR,4
;all done?
GOTO
NEXT
;no clear next
CONTINUE
;yes continue
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