PIC16F721-I/SO Microchip Technology, PIC16F721-I/SO Datasheet - Page 25

• Manufacturer Part Number: PIC16F721-I/SO
• Description: MCU PIC 4K FLASH 20-SOIC
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 16Fr

Specifications of PIC16F721-I/SO

• Core Size: 8-Bit
• Program Memory Size: 7KB (4K x 14)
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Core Processor: PIC
• Speed: 16MHz
• Connectivity: I²C, SPI, UART/USART
• Number Of I /o: 17
• Program Memory Type: FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 12x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 20-SOIC (0.300", 7.50mm Width)
• Controller Family/series: PIC16F
• No. Of I/o's: 18
• Ram Memory Size: 256Byte
• Cpu Speed: 16MHz
• No. Of Timers: 3
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

2.5
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 of
the STATUS register, as shown in
A simple program to clear RAM location 020h-02Fh
using indirect addressing is shown in
FIGURE 2-6:
 2010 Microchip Technology Inc.
Bank Select
RP1
Note:
Indirect Addressing, INDF and
FSR Registers
RP0 6
Direct Addressing
For memory map detail, refer to Figures
Data
Memory
Location Select
DIRECT/INDIRECT ADDRESSING
From Opcode
7Fh
00h
Figure
Bank 0
Example
00
0
2-6.
2-2.
Bank 1
01
Bank 2
2-3
10
and 2-4.
EXAMPLE 2-2:
NEXTCLRFINDF
CONTINUE
Bank 3
MOVLW020h
MOVWFFSR
BANKISEL020h
INCFFSR
BTFSSFSR,4 ;all done?
GOTONEXT
11
PIC16F/LF720/721
IRP
Bank Select
180h
1FFh
;initialize pointer
;to RAM
;clear INDF register
;inc pointer
;no clear next
;yes continue
7
Indirect Addressing
INDIRECT ADDRESSING
File Select Register
DS41430A-page 25
Location Select
0