參數(shù)資料
型號: PIC16C745/JW
廠商: Microchip Technology
文件頁數(shù): 90/165頁
文件大?。?/td> 0K
描述: IC MCU EPROM8KX14 USB A/D 28CDIP
標(biāo)準(zhǔn)包裝: 15
系列: PIC® 16C
核心處理器: PIC
芯體尺寸: 8-位
速度: 24MHz
連通性: SCI,UART/USART,USB
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 22
程序存儲器容量: 14KB(8K x 14)
程序存儲器類型: EPROM,UV
RAM 容量: 256 x 8
電壓 - 電源 (Vcc/Vdd): 4.35 V ~ 5.25 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 5x8b
振蕩器型: 外部
工作溫度: 0°C ~ 70°C
封裝/外殼: 28-CDIP(0.300",7.62mm)窗口
包裝: 管件
PIC16C745/765
DS41124C-page 30
Preliminary
2000 Microchip Technology Inc.
4.5
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 4-4.
A simple program to clear RAM locations 20h-2Fh
using indirect addressing is shown in Example 4-2.
EXAMPLE 4-2:
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
Note:
For register file map detail see Figure 4-2.
Data
Memory
Indirect Addressing
Direct Addressing
bank select
location select
RP<1:0>
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
745cov.book Page 30 Wednesday, August 2, 2000 8:24 AM
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