參數(shù)資料
型號(hào): PIC16C505-20I/SL
廠商: Microchip Technology
文件頁(yè)數(shù): 10/90頁(yè)
文件大?。?/td> 0K
描述: IC MCU OTP 1KX12 14SOIC
產(chǎn)品培訓(xùn)模塊: Asynchronous Stimulus
8-bit PIC® Microcontroller Portfolio
標(biāo)準(zhǔn)包裝: 57
系列: PIC® 16C
核心處理器: PIC
芯體尺寸: 8-位
速度: 20MHz
外圍設(shè)備: POR,WDT
輸入/輸出數(shù): 11
程序存儲(chǔ)器容量: 1.5KB(1K x 12)
程序存儲(chǔ)器類型: OTP
RAM 容量: 72 x 8
電壓 - 電源 (Vcc/Vdd): 3 V ~ 5.5 V
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 14-SOIC(0.154",3.90mm 寬)
包裝: 管件
配用: ISPICR1-ND - ADAPTER IN-CIRCUIT PROGRAMMING
309-1086-ND - ADAPTER 14-ZIF BD W/14-SO PLUGS
309-1085-ND - ADAPTER 14-DIP BD W/2 14-SO PLUG
309-1001-ND - ADAPTER 14-SOIC TO 14-DIP
309-1000-ND - ADAPTER 14-SOIC TO 14-DIP
PIC16C505
DS40192D-page 18
1999-2012 Microchip Technology Inc.
4.8
Indirect Data Addressing; INDF and
FSR Registers
The INDF
register
is not
a physical register.
Addressing INDF actually addresses the register
whose address is contained in the FSR register (FSR
is a
pointer). This is indirect addressing.
EXAMPLE 4-1:
INDIRECT ADDRESSING
Register file 07 contains the value 10h
Register file 08 contains the value 0Ah
Load the value 07 into the FSR register
A read of the INDF register will return the value
of 10h
Increment the value of the FSR register by one
(FSR = 08)
A read of the INDR register now will return the
value of 0Ah.
Reading INDF itself indirectly (FSR = 0) will produce
00h. Writing to the INDF register indirectly results in a
no-operation (although STATUS bits may be affected).
A simple program to clear RAM locations 10h-1Fh
using indirect addressing is shown in Example 4-2.
EXAMPLE 4-2:
HOW TO CLEAR RAM
USING INDIRECT
ADDRESSING
movlw
0x10
;initialize pointer
movwf
FSR
; to RAM
NEXT
clrf
INDF
;clear INDF register
incf
FSR,F
;inc pointer
btfsc
FSR,4
;all done?
goto
NEXT
;NO, clear next
CONTINUE
:
;YES, continue
:
The FSR is a 5-bit wide register. It is used in
conjunction with the INDF register to indirectly address
the data memory area.
The FSR<4:0> bits are used to select data memory
addresses 00h to 1Fh.
The device uses FSR<6:5> to select between banks
0:3.
FIGURE 4-4:
DIRECT/INDIRECT ADDRESSING
Note 1: For register map detail see Section 4.2.
Direct Addressing
(FSR)
6
5
4
(opcode)
0
bank select
location select
00
01
10
11
00h
0Fh
10h
Data
Memory(1)
1Fh
3Fh
5Fh
7Fh
Bank 0
Bank 1
Bank 2
Bank 3
Addresses
map back to
addresses
in Bank 0.
Indirect Addressing
6
5
4
(FSR)
0
bank
location select
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