参数资料
型号: PIC12C671T-04I/MF
厂商: Microchip Technology
文件页数: 46/129页
文件大小: 0K
描述: IC MCU OTP 1KX14 W/AD 8-DFN
标准包装: 3,300
系列: PIC® 12C
核心处理器: PIC
芯体尺寸: 8-位
速度: 4MHz
外围设备: POR,WDT
输入/输出数: 5
程序存储器容量: 1.75KB(1K x 14)
程序存储器类型: OTP
RAM 容量: 128 x 8
电压 - 电源 (Vcc/Vdd): 3 V ~ 5.5 V
数据转换器: A/D 4x8b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 8-VDFN 裸露焊盘
包装: 带卷 (TR)
配用: XLT08SO-1-ND - SOCKET TRANSITION 8SOIC 150/208
AC164324-ND - MODULE SKT FOR MPLAB 8DFN/16QFN
XLT08DFN2-ND - SOCKET TRANSITION ICE 14DIP/8DFN
XLT08DFN-ND - SOCKET TRANSITION ICE 8DFN
AC164032-ND - ADAPTER PICSTART PLUS 8DFN/DIP
AC124001-ND - MODULE SKT PROMATEII 8DIP/SOIC
1999 Microchip Technology Inc.
DS30561B-page 23
PIC12C67X
4.5
Indirect Addressing, INDF and FSR
Registers
The INDF Register is not a physical register. Address-
ing the INDF Register will cause indirect addressing.
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 4-4. However, IRP is
not used in the PIC12C67X.
A simple program to clear RAM locations 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,F
;inc pointer
btfss
FSR,4
;all done?
goto
NEXT
;no clear next
CONTINUE
:
;yes continue
FIGURE 4-4:
DIRECT/INDIRECT ADDRESSING
For register file map detail see Figure 4-2.
Note 1:
The RP1 and IRP bits are reserved; always maintain these bits clear.
Data
Memory
Indirect Addressing
Direct Addressing
bank select
location select
RP1 RP0(1)
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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