PIC16F877-20/P Microchip Technology, PIC16F877-20/P Datasheet - Page 107

• Manufacturer Part Number: PIC16F877-20/P
• Description: IC MCU FLASH 8KX14 EE 40DIP
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F877-20/P

• Core Size: 8-Bit
• Program Memory Size: 14KB (8K x 14)
• Core Processor: PIC
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 33
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 368 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 40-DIP (0.600", 15.24mm)
• Controller Family/series: PIC16F
• No. Of I/o's: 33
• Eeprom Memory Size: 256Byte
• Ram Memory Size: 368Byte
• Cpu Speed: 20MHz
• No. Of Timers: 3
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 444-1001 - DEMO BOARD FOR PICMICRO MCU
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

1997 Microchip Technology Inc.
Figure 6-8: Indirect Addressing
Example 6-2
minimum number of instructions. A similar concept could be used to move a defined number of
bytes (block) of data to the USART transmit register (TXREG). The starting address of the block
of data to be transmitted could easily be modified by the program.
Example 6-2: Indirect Addressing
NEXT
CONTINUE
7Fh
00h
Section 6. Memory Organization
BCF
MOVLW
MOVWF
CLRF
INCF
BTFSS
GOTO
:
shows a simple use of indirect addressing to clear RAM (locations 20h-2Fh) in a
Bank0
00
STATUS, IRP
0x20
FSR
INDF
FSR,F
FSR,4
NEXT
Bank1
01
Bank2
10
; Indirect addressing Bank0/1
; Initialize pointer to RAM
;
; Clear INDF register
; Inc pointer
; All done?
; NO, clear next
;
; YES, continue
Bank3
11
IRP
bank select
00h
7Fh
Data
Memory
7
Indirect Addressing
FSR register
DS31006A-page 6-13
location select
0
6