參數(shù)資料
型號: PIC10LF322-I/P
廠商: Microchip Technology
文件頁數(shù): 101/210頁
文件大?。?/td> 0K
描述: IC MCU 8BIT 896B FLASH 8DIP
產(chǎn)品培訓(xùn)模塊: 8-bit PIC® Microcontroller Portfolio
標(biāo)準(zhǔn)包裝: 60
系列: PIC® 10F
核心處理器: PIC
芯體尺寸: 8-位
速度: 16MHz
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 3
程序存儲(chǔ)器容量: 896B(512 x 14)
程序存儲(chǔ)器類型: 閃存
RAM 容量: 64 x 8
電壓 - 電源 (Vcc/Vdd): 1.8 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 3x8b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 8-DIP(0.300",7.62mm)
包裝: 管件
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2011 Microchip Technology Inc.
Preliminary
DS41585A-page 19
PIC10(L)F320/322
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 2-3 shows the two
situations for the loading of the PC. The upper example
in Figure 2-3 shows how the PC is loaded on a write to
PCL (PCLATH<4:0>
PCH). The lower example in
Figure 2-3 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
MODIFYING PCL
Executing any instruction with the PCL register as the
destination simultaneously causes the Program
Counter PC<12:8> bits (PCH) to be replaced by the
contents of the PCLATH register. This allows the entire
contents of the program counter to be changed by
writing the desired upper 5 bits to the PCLATH register.
When the lower 8 bits are written to the PCL register, all
13 bits of the program counter will change to the values
contained in the PCLATH register and those being
written to the PCL register.
A computed GOTO is accomplished by adding an offset
to the program counter (ADDWF PCL). Care should be
exercised when jumping into a look-up table or
program branch table (computed GOTO) by modifying
the PCL register. Assuming that PCLATH is set to the
table start address, if the table length is greater than
255 instructions or if the lower 8 bits of the memory
address rolls over from 0xFF to 0x00 in the middle of
the table, then PCLATH must be incremented for each
address rollover that occurs between the table
beginning and the target location within the table.
For more information refer to Application Note AN556,
“Implementing a Table Read” (DS00556).
2.3.2
STACK
All devices have 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 inter-
rupt causes a branch. The stack is POPed in the event
of a RETURN, RETLW or a RETFIE instruction execu-
tion. PCLATH is not affected by a PUSH or POP oper-
ation.
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
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 and the IRP bit of the
STATUS register, as shown in Figure 2-4.
A simple program to clear RAM location 40h-7Fh using
indirect addressing is shown in Example 2-1.
EXAMPLE 2-1:
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
0x40
;initialize pointer
MOVWF
FSR
;to RAM
NEXT
CLRF
INDF
;clear INDF register
INCF
FSR
;inc pointer
BTFSS
FSR,7
;all done?
GOTO
NEXT
;no clear next
CONTINUE
;yes continue
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