參數(shù)資料
型號： PIC16F77
廠商： Microchip Technology Inc.
英文描述： 40-Pin 8-Bit CMOS FLASH Microcontrollers(40腳、8位CMOS 閃速微控制器)
中文描述： 40引腳8位CMOS閃存微控制器（40腳，8位的CMOS閃速微控制器）
文件頁數(shù)： 26/170頁
文件大小： 3150K
代理商： PIC16F77
PIC16F7X
DS30325A-page 26
Advance Information
2000 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 2-5 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 2-5:
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 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 PIC16F7X 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
PIC16F7X devices are capable of addressing a contin-
uous 8K word block of program memory. The
CALL
and
GOTO
instructions provide only 11 bits of address to
allow branching within any 2K program memory page.
When doing a
CALL
or
GOTO
instruction, the upper 2
bits of the address are provided by PCLATH<4:3>.
When doing a
CALL
or
GOTO
instruction, the user must
ensure that the page select bits are programmed so
that the desired program memory page is addressed. If
a return from a
CALL
instruction (or interrupt) is exe-
cuted, the entire 13-bit PC is popped off the stack.
Therefore, manipulation of the PCLATH<4:3> bits are
not required for the return instructions (which POPs the
address from the stack).
Example 2-1 shows the calling of a subroutine in
page 1 of the program memory. This example assumes
that PCLATH is saved and restored by the Interrupt
Service Routine
(if interrupts are used).
EXAMPLE 2-1:
CALL OF A SUBROUTINE IN
PAGE 1 FROM PAGE 0
ORG 0x500
BCF PCLATH,4
BSF PCLATH,3
CALLSUB1_P1
:
:
ORG 0x900
SUB1_P1
:
:
:
RETURN
;Select page 1 (800h-FFFh)
;Call subroutine in
;page 1 (800h-FFFh)
;page 1 (800h-FFFh)
;called subroutine
;page 1 (800h-FFFh)
;return to Call subroutine
;in page 0 (000h-7FFh)
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
instructions or the vectoring to an interrupt
address.
Note:
The contents of the PCLATH are
unchanged after a
RETURN
or
RETFIE
instruction is executed. The user must
setup the PCLATH for any subsequent
CALLS
or
GOTOS
.
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PIC16F777-E/ML 功能描述:8位微控制器 -MCU 14KB 368 RAM 22 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 最大時鐘頻率:50 MHz 程序存儲器大小: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
PIC16F777-E/P 功能描述:8位微控制器 -MCU 14kBF 368RM 36I/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 最大時鐘頻率:50 MHz 程序存儲器大小: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
PIC16F777-E/PT 功能描述:8位微控制器 -MCU 14kBF 368RM 36I/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 最大時鐘頻率:50 MHz 程序存儲器大小: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
PIC16F777-I/ML 功能描述:8位微控制器 -MCU 14KB 368 RAM 36 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 最大時鐘頻率:50 MHz 程序存儲器大小: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
PIC16F777-I/P 功能描述:8位微控制器 -MCU 14KB 368 RAM 36 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 最大時鐘頻率:50 MHz 程序存儲器大小: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
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