參數(shù)資料
型號: PIC16C662T-20I/P
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 20 MHz, RISC MICROCONTROLLER, PDIP40
封裝: 0.600 INCH, PLASTIC, DIP-40
文件頁數(shù): 58/136頁
文件大?。?/td> 634K
代理商: PIC16C662T-20I/P
PIC16C64X & PIC16C66X
DS30559A-page 28
Preliminary
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 data pointed to by the le 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 register and the IRP bit (STATUS<7>), as
shown in Figure 4-12. However, bit IRP is not used in
the PIC16C64X & PIC16C66X.
A simple program to clear RAM location 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
;inc pointer
btfss FSR,4 ;all done?
goto
NEXT
;no goto next
;yes continue
CONTINUE:
FIGURE 4-12: DIRECT/INDIRECT ADDRESSING
For memory map detail see Figure 4-3 and Figure 4-4.
Note 1: Bits RP1 and IRP 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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