PIC16C505-04/SL Microchip Technology, PIC16C505-04/SL Datasheet - Page 18

• Manufacturer Part Number: PIC16C505-04/SL
• Description: IC MCU OTP 1KX12 14SOIC
• Manufacturer: Microchip Technology
• Series: PIC® 16Cr

Specifications of PIC16C505-04/SL

• Program Memory Type: OTP
• Program Memory Size: 1.5KB (1K x 12)
• Package / Case: 14-SOIC (3.9mm Width), 14-SOL
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 4MHz
• Peripherals: POR, WDT
• Number Of I /o: 11
• Ram Size: 72 x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Processor Series: PIC16C
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 72 B
• Maximum Clock Frequency: 4 MHz
• Number Of Programmable I/os: 11
• Number Of Timers: 1
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734
• Development Tools By Supplier: ICE2000
• Minimum Operating Temperature: 0 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: ISPICR1 - ADAPTER IN-CIRCUIT PROGRAMMING309-1086 - 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