參數(shù)資料
型號: PIC14000
廠商: Microchip Technology Inc.
英文描述: CTV 22C 22#22D SKT RECP
中文描述: 28引腳可編程混合信號控制器
文件頁數(shù): 24/152頁
文件大?。?/td> 953K
代理商: PIC14000
PIC14000
DS40122B-page 24
Preliminary
1996 Microchip Technology Inc.
4.4
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
register. Any instruction using the INDF register
actually accesses data pointed to by the file select
register (FSR). Reading INDF itself indirectly will
produce 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 4-10. However, IRP
is not used in the PIC14000.
A simple program to clear RAM location 20h-2Fh using
indirect addressing is shown in Example 4-2.
EXAMPLE 4-2:
INDIRECT ADDRESSING
movlw
movf
clrf
incf
btfss
goto
0x20
FSR
INDF
FSR ;inc pointer
FSR,4
;all done
NEXT
;no clear next
;yes continue
;initialize pointer
;to RAM
;clear INDF register
NEXT
CONTINUE:
FIGURE 4-10: INDIRECT/INDIRECT ADDRESSING
Note: For memory map detail see Figure 4-1.
00
00
01
10
11
00
IRP
7
FSR
00
bank select
location select
0
6
from opcode
location select
bank select
RP1 RP0
Indirect Addressing
Direct Addressing
Data
Memory
not used
Bank 0
Bank 1
Bank 2
Bank 3
7F
7F
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PIC14000-04/SS 功能描述:8位微控制器 -MCU 7KB 192 RAM 20 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT