PIC16F785-I/P Microchip Technology Inc., PIC16F785-I/P Datasheet - Page 24

• Manufacturer Part Number: PIC16F785-I/P
• Description: MCU, 8-Bit, 2KW Flash, 128 RAM, 18 I/O, DIP-20
• Manufacturer: Microchip Technology Inc.

Specifications of PIC16F785-I/P

• A/d Inputs: 12-Channel, 10-Bit
• Comparators: 2
• Cpu Speed: 5 MIPS
• Eeprom Memory: 256 Bytes
• Input Output: 17
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 20-pin PDIP
• Programmable Memory: 3.5K Bytes
• Ram Size: 128 Bytes
• Speed: 20 MHz
• Timers: 2-8-bit, 1-16-bit
• Voltage, Range: 2-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

PIC16F785/HV785
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:
DS41249D-page 22
Bank Select
RP1RP0
Note:
Indirect Addressing, INDF and
FSR Registers
Direct Addressing
6
For memory map detail see Figure 2-2.
Data
Memory
DIRECT/INDIRECT ADDRESSING PIC16F785/HV785
Location Select
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 CLRF
CONTINUE
Bank 3
MOVLW 0x20
MOVWF FSR
INCF
BTFSS FSR,4
GOTO
11
IRP
Bank Select
180h
1FFh
INDF
FSR
NEXT
7
INDIRECT ADDRESSING
;initialize pointer
;to RAM
;clear INDF register
;increment pointer
;all done?
;no clear next
;yes continue
© 2006 Microchip Technology Inc.
Indirect Addressing
File Select Register
Location Select
0