- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄368730 > 16F872 (Microchip Technology Inc.) CAT 5E CROSSOVER PATCH CORD CABLE GREEN 10 FT PDF資料下載
參數(shù)資料
| 型號(hào)： | 16F872 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | CAT 5E CROSSOVER PATCH CORD CABLE GREEN 10 FT |
| 中文描述： | 28引腳，8位閃存微控制器的CMOS |
| 文件頁(yè)數(shù)： | 20/160頁(yè) |
| 文件大?。?/td> | 2600K |
| 代理商： | 16F872 |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)當(dāng)前第20頁(yè)第21頁(yè)第22頁(yè)第23頁(yè)第24頁(yè)第25頁(yè)第26頁(yè)第27頁(yè)第28頁(yè)第29頁(yè)第30頁(yè)第31頁(yè)第32頁(yè)第33頁(yè)第34頁(yè)第35頁(yè)第36頁(yè)第37頁(yè)第38頁(yè)第39頁(yè)第40頁(yè)第41頁(yè)第42頁(yè)第43頁(yè)第44頁(yè)第45頁(yè)第46頁(yè)第47頁(yè)第48頁(yè)第49頁(yè)第50頁(yè)第51頁(yè)第52頁(yè)第53頁(yè)第54頁(yè)第55頁(yè)第56頁(yè)第57頁(yè)第58頁(yè)第59頁(yè)第60頁(yè)第61頁(yè)第62頁(yè)第63頁(yè)第64頁(yè)第65頁(yè)第66頁(yè)第67頁(yè)第68頁(yè)第69頁(yè)第70頁(yè)第71頁(yè)第72頁(yè)第73頁(yè)第74頁(yè)第75頁(yè)第76頁(yè)第77頁(yè)第78頁(yè)第79頁(yè)第80頁(yè)第81頁(yè)第82頁(yè)第83頁(yè)第84頁(yè)第85頁(yè)第86頁(yè)第87頁(yè)第88頁(yè)第89頁(yè)第90頁(yè)第91頁(yè)第92頁(yè)第93頁(yè)第94頁(yè)第95頁(yè)第96頁(yè)第97頁(yè)第98頁(yè)第99頁(yè)第100頁(yè)第101頁(yè)第102頁(yè)第103頁(yè)第104頁(yè)第105頁(yè)第106頁(yè)第107頁(yè)第108頁(yè)第109頁(yè)第110頁(yè)第111頁(yè)第112頁(yè)第113頁(yè)第114頁(yè)第115頁(yè)第116頁(yè)第117頁(yè)第118頁(yè)第119頁(yè)第120頁(yè)第121頁(yè)第122頁(yè)第123頁(yè)第124頁(yè)第125頁(yè)第126頁(yè)第127頁(yè)第128頁(yè)第129頁(yè)第130頁(yè)第131頁(yè)第132頁(yè)第133頁(yè)第134頁(yè)第135頁(yè)第136頁(yè)第137頁(yè)第138頁(yè)第139頁(yè)第140頁(yè)第141頁(yè)第142頁(yè)第143頁(yè)第144頁(yè)第145頁(yè)第146頁(yè)第147頁(yè)第148頁(yè)第149頁(yè)第150頁(yè)第151頁(yè)第152頁(yè)第153頁(yè)第154頁(yè)第155頁(yè)第156頁(yè)第157頁(yè)第158頁(yè)第159頁(yè)第160頁(yè)
PIC16F872
DS30221A-page 20
Preliminary
1999 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 upper bits (PC<12:8>) are not
readable, but are indirectly writable through the
PCLATH register. On any reset, the upper bits of the
PC will be cleared. Figure 2-3 shows the two situations
for the loading of the PC. The upper example in the fig-
ure shows how the PC is loaded on a write to PCL
(PCLATH<4:0>
→
PCH). The lower example in the fig-
ure shows how the PC is loaded during a
CALL
or
GOTO
instruction (PCLATH<4:3>
→
PCH).
FIGURE 2-3:
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 doing 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,
“Implementing a Table Read"
(AN556).
2.3.2
STACK
The PIC16CXX family has an 8-level deep x 13-bit wide
hardware stack. 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).
2.4
Program Memory Paging
The PIC16CXXX architecture is capable of addressing
a continuous 8K word block of program memory. The
CALL
and
GOTO
instructions provide 11 bits of the
address, which allows branches within any 2K program
memory page. Therefore, the 8K words of program
memory are broken into four pages. Since the
PIC16FC872 has only 2K words of program memory or
one page, additional code is not required to ensure that
the correct page is selected before a
CALL
or
GOTO
instruction is executed. The PCLATH<4:3> bits should
always be maintained as zeros. If a return from a
CALL
instruction (or interrupt) is executed, the entire 13-bit
PC is popped off the stack. Manipulation of the
PCLATH is not required for the return instructions.
2.5
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 reg-
ister. Any instruction using the INDF register actually
accesses the register pointed to by the File Select Reg-
ister, FSR. Reading the INDF register itself indirectly
(FSR = ’0’) will read 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
(STATUS<7>), as shown in Figure 2-4.
A simple program to clear RAM locations 20h-2Fh
using indirect addressing is shown in Example 2-1.
EXAMPLE 2-1:
INDIRECT ADDRESSING
movlw
movwf
clrf
incf
btfss
goto
0x20
FSR
INDF
FSR,F
FSR,4
NEXT
;initialize pointer
;to RAM
;clear INDF register
;inc pointer
;all done
;no clear next
NEXT
CONTINUE
:
;yes continue
PC
12
8
7
0
5
PCLATH<4:0>
PCLATH
Instruction with
PCL as
Destination
ALU
GOTO,CALL
Opcode <10:0>
8
PC
12
11 10
0
11
PCLATH<4:3>
PCH
PCL
8
7
2
PCLATH
PCH
PCL
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
instruc-
tions or the vectoring to an interrupt
address.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 16F876A | 28/40-pin Enhanced FLASH Microcontrollers |
| 16F876 | CAT 5E CROSSOVER, GREEN 15 FT PATCH CABLE |
| 16F877 | CAT 5E CROSSOVER PATCH CORD CABLE GREEN 20 FT |
| 16FL100S02 | 6A, 12A AND 16A FAST RECOVERY RECTIFIERS |
| 16FL100S05 | 6A, 12A AND 16A FAST RECOVERY RECTIFIERS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 16F876 | 制造商:MICROCHIP 制造商全稱(chēng):Microchip Technology 功能描述:28/40-pin 8-Bit CMOS FLASH Microcontrollers |
| 16F876A | 制造商:MICROCHIP 制造商全稱(chēng):Microchip Technology 功能描述:28/40-pin Enhanced FLASH Microcontrollers |
| 16F877 | 制造商:MICROCHIP 制造商全稱(chēng):Microchip Technology 功能描述:28/40-pin 8-Bit CMOS FLASH Microcontrollers |
| 16F9040 | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:COMPACT DIGITALMULTIMETER TRUE RMS |
| 16F9041 | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:COMPACT DMM MIT RS232 |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。