PIC16F877-20/P Microchip Technology, PIC16F877-20/P Datasheet - Page 149

• 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

9.5
1997 Microchip Technology Inc.
PORTD and the TRISD Register
PORTD is an 8-bit port with Schmitt Trigger input buffers. Each pin is individually configurable as
an input or output.
Example 9-4: Initializing PORTD
Figure 9-7: Typical PORTD Block Diagram (in I/O Port Mode)
Data Bus
WR PORT
WR TRIS
Note: I/O pins have protection diodes to V
RD PORT
CLRF
CLRF
BSF
MOVLW
MOVWF
STATUS
PORTD
STATUS, RP0
0xCF
TRISD
TRIS Latch
Data Latch
D
D
CK
CK
; Bank0
; Initialize PORTD by clearing output
;
; Select Bank1
; Value used to initialize data direction
; PORTD<3:0> = inputs, PORTD<5:4> = outputs
;
Q
Q
Q
Q
RD TRIS
data latches
PORTD<7:6> = inputs
DD
and V
Section 9. I/O Ports
SS
.
Q
EN
D
DS31009A-page 9-9
Schmitt
Trigger
input
buffer
I/O pin
9