參數(shù)資料
型號(hào): PIC18F6310
廠商: Microchip Technology Inc.
英文描述: 64/80-Pin Flash Microcontrollers with nanoWatt Technology
中文描述: 64/80-Pin閃存微控制器與納瓦技術(shù)
文件頁(yè)數(shù): 66/404頁(yè)
文件大?。?/td> 3268K
代理商: PIC18F6310
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PIC18F6310/6410/8310/8410
DS39635A-page 64
Preliminary
2004 Microchip Technology Inc.
5.1.2
PROGRAM COUNTER
The Program Counter (PC) specifies the address of the
instruction to fetch for execution. The PC is 21 bits wide
and is contained in three separate 8-bit registers. The
low byte, known as the PCL register, is both readable
and writable. The high byte, or PCH register, contains
the PC<15:8> bits; it is not directly readable or writable.
Updates to the PCH register are performed through the
PCLATH register. The upper byte is called PCU. This
register contains the PC<20:16> bits; it is also not
directly readable or writable. Updates to the PCU
register are performed through the PCLATU register.
The contents of PCLATH and PCLATU are transferred
to the program counter by any operation that writes
PCL. Similarly, the upper two bytes of the program
counter are transferred to PCLATH and PCLATU by an
operation that reads PCL. This is useful for computed
offsets to the PC (see
Section 5.1.5.1 “Computed
GOTO”
).
The PC addresses bytes in the program memory. To
prevent the PC from becoming misaligned with word
instructions, the Least Significant bit of PCL is fixed to
a value of ‘
0
’. The PC increments by 2 to address
sequential instructions in the program memory.
The
CALL, RCALL, GOTO
and program branch
instructions write to the program counter directly. For
these instructions, the contents of PCLATH and
PCLATU are not transferred to the program counter.
5.1.3
RETURN ADDRESS STACK
The return address stack allows any combination of up
to 31 program calls and interrupts to occur. The PC is
pushed onto the stack when a
CALL
or
RCALL
instruc-
tion is executed, or an interrupt is Acknowledged. The
PC value is pulled off the stack on a
RETURN
,
RETLW
or
a
RETFIE
instruction. PCLATU and PCLATH are not
affected by any of the
RETURN
or
CALL
instructions.
The stack operates as a 31-word by 21-bit RAM and a
5-bit Stack Pointer register, STKPTR. The stack space
is not part of either program or data space. The Stack
Pointer is readable and writable and the address on the
top of the stack is readable and writable through the
Top-of-Stack Special File Registers. Data can also be
pushed to or popped from the stack using these
registers.
A
CALL
type instruction causes a push onto the stack;
the Stack Pointer is first incremented and the location
pointed to by the Stack Pointer is written with the
contents of the PC (already pointing to the instruction
following the
CALL
). A
RETURN
type instruction causes
a pop from the stack; the contents of the location
pointed to by the STKPTR are transferred to the PC
and then the Stack Pointer is decremented.
The Stack Pointer is initialized to ‘
00000
’ after all
Resets. There is no RAM associated with the location
corresponding to a Stack Pointer value of ‘
00000
’; this
is only a Reset value. Status bits indicate if the stack is
full, has overflowed or has underflowed.
5.1.3.1
Top-of-Stack Access
Only the top of the return address stack (TOS) is
readable and writable. A set of three registers,
TOSU:TOSH:TOSL, hold the contents of the stack
location pointed to by the STKPTR register
(Figure 5-3). This allows users to implement a software
stack if necessary. After a
CALL
,
RCALL
or interrupt, the
software can read the pushed value by reading the
TOSU:TOSH:TOSL registers. These values can be
placed on a user defined software stack. At return time,
the
software
can
return
TOSU:TOSH:TOSL and do a return.
The user must disable the global interrupt enable bits
while accessing the stack to prevent inadvertent stack
corruption.
these
values
to
FIGURE 5-3:
RETURN ADDRESS STACK AND ASSOCIATED REGISTERS
00011
00010
00001
00000
001A34h
000D58h
11111
11110
11101
00010
Return Address Stack <20:0>
Top-of-Stack
TOSL
34h
TOSH
1Ah
TOSU
00h
STKPTR<4:0>
Top-of-Stack Registers
Stack Pointer
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PIC18F6310-I/PT 功能描述:8位微控制器 -MCU 16kBF 768RM 68I/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
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