PIC16C505-20E/SL Microchip Technology, PIC16C505-20E/SL Datasheet - Page 18
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PIC16C505-20E/SL
Manufacturer Part Number
PIC16C505-20E/SL
Description
IC,MICROCONTROLLER,8-BIT,PIC CPU,CMOS,SOP,14PIN,PLASTIC
Manufacturer
Microchip Technology
Series
PIC® 16Cr
Specifications of PIC16C505-20E/SL
Rohs Compliant
YES
Core Processor
PIC
Core Size
8-Bit
Speed
20MHz
Peripherals
POR, WDT
Number Of I /o
11
Program Memory Size
1.5KB (1K x 12)
Program Memory Type
OTP
Ram Size
72 x 8
Voltage - Supply (vcc/vdd)
3 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 125°C
Package / Case
14-SOIC (3.9mm Width), 14-SOL
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
309-1086 - ADAPTER 14-ZIF BD W/14-SO PLUGS309-1085 - ADAPTER 14-DIP BD W/2 14-SO PLUG309-1001 - ADAPTER 14-SOIC TO 14-DIP309-1000 - ADAPTER 14-SOIC TO 14-DIP
Eeprom Size
-
Data Converters
-
Connectivity
-
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
PIC16C505
4.8
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:
• 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
• Increment the value of the FSR register by one
• A read of the INDR register now will return the
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.
FIGURE 4-4:
DS40192C-page 18
of 10h
(FSR = 08)
value of 0Ah.
bank select
(FSR)
6
Indirect Data Addressing; INDF and
FSR Registers
5
Direct Addressing
DIRECT/INDIRECT ADDRESSING
INDIRECT ADDRESSING
Data
Memory
location select
4
(1)
(opcode)
Note 1: For register map detail see Section 4.2.
00h
0Fh
10h
1Fh
0
Bank 0
00
3Fh
Bank 1
01
5Fh
Bank 2
10
EXAMPLE 4-2:
NEXT
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.
The device uses FSR<6:5> to select between banks
0:3.
7Fh
Addresses
map back to
addresses
in Bank 0.
Bank 3
11
movlw
movwf
clrf
incf
btfsc
goto
:
:
HOW TO CLEAR RAM
USING INDIRECT
ADDRESSING
0x10
FSR
INDF
FSR,F
FSR,4
NEXT
6
1999 Microchip Technology Inc.
Indirect Addressing
bank
5
4
;initialize pointer
; to RAM
;clear INDF register
;inc pointer
;all done?
;NO, clear next
;YES, continue
location select
(FSR)
0