PIC16F785-I/SO Microchip Technology, PIC16F785-I/SO Datasheet - Page 24

• Manufacturer Part Number: PIC16F785-I/SO
• Description: IC PIC MCU FLASH 2KX14 20SOIC
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F785-I/SO

• Program Memory Type: FLASH
• Program Memory Size: 3.5KB (2K x 14)
• Package / Case: 20-SOIC (7.5mm Width)
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 17
• Eeprom Size: 256 x 8
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Data Converters: A/D 14x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: PIC16F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 128 B
• Interface Type: RS- 232/USB
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 17
• Number Of Timers: 3
• Operating Supply Voltage: 2 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000, DV164120, DM163029
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 14-ch x 10-bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: XLT20SO1-1 - SOCKET TRANS ICE 20DIP TO 20SOICXLT18SO-1 - SOCKET TRANSITION 18SOIC 300MILAC162060 - HEADER INTRFC MPLAB ICD2 20PINAC164039 - MODULE SKT PROMATE II 20DIP/SOIC
• Connectivity: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

PIC16F785
2.4
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 and the IRP bit
(Status<7>), as shown in Figure 2-4.
FIGURE 2-4:
DS41249A-page 22
BANK SELECT
RP1 RP0
For memory map detail see Figure 2-2.
Indirect Addressing, INDF and
FSR Registers
DIRECT ADDRESSING
6
DATA
MEMORY
LOCATION SELECT
DIRECT/INDIRECT ADDRESSING PIC16F785
FROM OPCODE
7FH
00H
BANK 0
00
0
BANK 1
01
Preliminary
BANK 2
10
A simple program to clear RAM location 20h – 2Fh
using indirect addressing is shown in Example 2-1.
EXAMPLE 2-1:
NEXT
CONTINUE
BANK 3
11
MOVLW
MOVWF
CLRF
INCF
BTFSS
GOTO
IRP
BANK SELECT
180H
1FFH
0x20
FSR
INDF
FSR
FSR,4
NEXT
7
INDIRECT ADDRESSING
INDIRECT ADDRESSING
 2004 Microchip Technology Inc.
FILE SELECT REGISTER
;initialize pointer
;to RAM
;clear INDF register
;increment pointer
;all done?
;no clear next
;yes continue
LOCATION SELECT
0