參數(shù)資料
型號(hào): PIC16CR620A
廠商: Microchip Technology Inc.
元件分類: 8位微控制器
英文描述: EPROM-Based 8-Bit CMOS Microcontroller
中文描述: 存儲(chǔ)器為基礎(chǔ)的8位CMOS微控制器
文件頁(yè)數(shù): 24/108頁(yè)
文件大?。?/td> 645K
代理商: PIC16CR620A
PIC16C62X
DS30235G-page 24
Preliminary
1998 Microchip Technology Inc.
4.4
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 reg-
ister. 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 register and the IRP bit (STATUS<7>), as
shown in Figure 4-15. However, IRP is not used in the
PIC16C62X.
A simple program to clear RAM location 20h-2Fh using
indirect addressing is shown in Example 4-1.
EXAMPLE 4-1:
INDIRECT ADDRESSING
movlw
movwf
clrf
incf
btfss
goto
0x20
FSR
INDF
FSR
FSR,4
NEXT
;initialize pointer
;to RAM
;clear INDF register
;inc pointer
;all done
;no clear next
;yes continue
NEXT
CONTINUE:
FIGURE 4-15: DIRECT/INDIRECT ADDRESSING PIC16C62X
For memory map detail see (Figure 4-4, Figure 4-5, Figure 4-6 and Figure 4-7).
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
180h
1FFh
00h
7Fh
Bank 0
Bank 1
Bank 2
Bank 3
not used
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