參數(shù)資料
型號: ENC424J600T-I/PT
廠商: Microchip Technology
文件頁數(shù): 91/168頁
文件大?。?/td> 0K
描述: IC ETHERNET CTRLR W/SPI 44-TQFP
視頻文件: Fast 100 Mbps Ethernet PICtail Plus Overview
標準包裝: 1,200
控制器類型: 以太網(wǎng)控制器(IEEE 802.3)
接口: SPI
電源電壓: 3 V ~ 3.6 V
電流 - 電源: 96mA
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 44-TQFP
供應商設備封裝: 44-TQFP(10x10)
包裝: 帶卷 (TR)
配用: AC164132-ND - BOARD DAUGHTER PICTAIL ETHERNET
2007 Microchip Technology Inc.
DS21993C-page 27
PIC16CR7X
2.5
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 2-2.
A simple program to clear RAM locations 20h-2Fh
using indirect addressing is shown in Example 2-2.
EXAMPLE 2-2:
INDIRECT ADDRESSING
FIGURE 2-5:
DIRECT/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
Note 1:
For register file map detail, see Figure 2-2.
Data
Memory(1)
Indirect Addressing
Direct Addressing
Bank Select
Location Select
RP1:RP0
6
0
From Opcode
IRP
FSR Register
7
0
Bank Select
Location Select
00
01
10
11
Bank 0
Bank 1
Bank 2
Bank 3
FFh
80h
7Fh
00h
17Fh
100h
1FFh
180h
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