參數(shù)資料
型號(hào): PIC16C715
廠商: Microchip Technology Inc.
英文描述: 8-Bit CMOS Microcontroller with A/D Converter(每個(gè)I/O口有25mA驅(qū)動(dòng)/吸收電流,微控制器)
中文描述: 8位CMOS微控制器與A / D轉(zhuǎn)換器(每個(gè)的I / O口有25毫安驅(qū)動(dòng)/吸收電流,微控制器)
文件頁數(shù): 22/120頁
文件大?。?/td> 764K
代理商: PIC16C715
PIC16C715
DS30560A-page 22
Advance Information
1996 Microchip Technology Inc.
4.5
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 4-10. However, IRP
is not used in the PIC16C715.
A simple program to clear RAM locations 20h-2Fh
using indirect addressing is shown in Example 4-1.
EXAMPLE 4-1:
INDIRECT ADDRESSING
movlw 0x20 ;initialize pointer
movwf FSR ;to RAM
NEXT clrf INDF ;clear INDF register
incf FSR,F ;inc pointer
btfss FSR,4 ;all done
goto NEXT ;no clear next
CONTINUE
: ;yes continue
FIGURE 4-10: DIRECT/INDIRECT ADDRESSING
For register file map detail see Figure 4-2.
Note 1: The RP1 and IRP bits are reserved, always maintain these bits clear.
Data
Memory
Indirect Addressing
Direct Addressing
bank select
location select
(1)
RP1 RP0
6
0
from opcode
IRP
(1)
FSR register
7
0
bank select
location select
00
01
10
11
00h
7Fh
00h
7Fh
Bank 0
Bank 1
Bank 2
Bank 3
not used
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