參數(shù)資料
型號： PIC12CE519-04/SM
廠商： Microchip Technology
文件頁數(shù)： 27/113頁
文件大?。?/td> 0K
描述： IC MCU OTP 1KX12 W/EE 8-SOIJ
產(chǎn)品培訓(xùn)模塊： Asynchronous Stimulus
8-bit PIC® Microcontroller Portfolio
標(biāo)準(zhǔn)包裝： 90
系列： PIC® 12C
核心處理器： PIC
芯體尺寸： 8-位
速度： 4MHz
外圍設(shè)備： POR，WDT
輸入/輸出數(shù)： 5
程序存儲器容量： 1.5KB（1K x 12）
程序存儲器類型： OTP
EEPROM 大?。?/td> 16 x 8
RAM 容量： 41 x 8
電壓 - 電源 (Vcc/Vdd)： 3 V ~ 5.5 V
振蕩器型： 內(nèi)部
工作溫度： 0°C ~ 70°C
封裝/外殼： 8-SOIC（0.209"，5.30mm 寬）
包裝： 管件
配用： XLT08SO-1-ND - SOCKET TRANSITION 8SOIC 150/208
AC164312-ND - MODULE SKT FOR PM3 16SOIC
ISPICR1-ND - ADAPTER IN-CIRCUIT PROGRAMMING
309-1048-ND - ADAPTER 8-SOIC TO 8-DIP
309-1047-ND - ADAPTER 8-SOIC TO 8-DIP
AC124001-ND - MODULE SKT PROMATEII 8DIP/SOIC
PIC12C5XX
DS40139E-page 20
1999 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.
PIC12C508/PIC12C508A/PIC12CE518:
Does not
use banking. FSR<7:5> are unimplemented and read
as '1's.
PIC12C509/PIC12C509A/PIC12CR509A/
PIC12CE519: Uses FSR<5>. Selects between bank 0
and bank 1. FSR<7:6> is unimplemented, read as '1’ .
FIGURE 4-9:
DIRECT/INDIRECT ADDRESSING
Note 1: For register map detail see Section 4.2.
Note 2: PIC12C509, PIC12C509A, PIC12CR509A, PIC12CE519.
bank
location select
bank select
Indirect Addressing
Direct Addressing
Data
Memory(1)
0Fh
10h
Bank 0
Bank 1(2)
0
4
5
6
(FSR)
00
01
00h
1Fh
3Fh
(opcode)
0
4
5
6
(FSR)
Addresses
map back to
addresses
in Bank 0.
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