参数资料
型号: PIC16C72A-04E/SS
厂商: Microchip Technology
文件页数: 31/120页
文件大小: 0K
描述: IC MCU OTP 2KX14 A/D PWM 28SSOP
产品培训模块: Asynchronous Stimulus
标准包装: 47
系列: PIC® 16C
核心处理器: PIC
芯体尺寸: 8-位
速度: 4MHz
连通性: I²C,SPI
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 22
程序存储器容量: 3.5KB(2K x 14)
程序存储器类型: OTP
RAM 容量: 128 x 8
电压 - 电源 (Vcc/Vdd): 4 V ~ 5.5 V
数据转换器: A/D 5x8b
振荡器型: 外部
工作温度: -40°C ~ 125°C
封装/外壳: 28-SSOP(0.209",5.30mm 宽)
包装: 管件
配用: 309-1025-ND - ADAPTER 28-SSOP TO 28-DIP
PIC16C62B/72A
DS35008B-page 18
Preliminary
1999 Microchip Technology Inc.
2.5
Indirect Addressing, INDF and FSR
Registers
The INDF register is not a physical register. Address-
ing INDF actually addresses the register whose
address is contained in the FSR register (FSR is a
pointer).
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 20h-2Fh
using indirect addressing is shown in Example 2-1.
EXAMPLE 2-1:
HOW TO CLEAR RAM
USING INDIRECT
ADDRESSING
movlw
0x20
;initialize pointer
movwf
FSR
;
to RAM
NEXT
clrf
INDF
;clear INDF register
incf
FSR
;inc pointer
btfss
FSR,4 ;all done?
goto
NEXT
;NO, clear next
CONTINUE
:
;YES, continue
An effective 9-bit address is obtained by concatenating
the 8-bit FSR register and the IRP bit (STATUS<7>), as
shown in Figure 2-3. However, IRP is not used in the
PIC16C62B/72A.
FIGURE 2-3:
DIRECT/INDIRECT ADDRESSING
Note 1: Maintain clear for upward compatibility with future products.
2: Not implemented.
Data
Memory
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
not used
FFh
80h
7Fh
00h
17Fh
100h
1FFh
180h
(1)
(2)
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