PIC16F877T-04/PT Microchip Technology, PIC16F877T-04/PT Datasheet - Page 70
![IC MCU FLASH 8KX14 EE 44TQFP](/photos/6/82/68251/c04-076_pt_sml.jpg)
PIC16F877T-04/PT
Manufacturer Part Number
PIC16F877T-04/PT
Description
IC MCU FLASH 8KX14 EE 44TQFP
Manufacturer
Microchip Technology
Series
PIC® 16Fr
Datasheets
1.PIC16F616T-ISL.pdf
(8 pages)
2.PIC16F688T-ISL.pdf
(688 pages)
3.PIC16C770-ISO.pdf
(8 pages)
4.PIC16F873-04SO.pdf
(218 pages)
5.PIC16F873-04SO.pdf
(5 pages)
6.PIC16F873-04SO.pdf
(5 pages)
Specifications of PIC16F877T-04/PT
Core Processor
PIC
Core Size
8-Bit
Speed
4MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
33
Program Memory Size
14KB (8K x 14)
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
44-TQFP, 44-VQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC16F877T-04/PT
Manufacturer:
Microchip Technology
Quantity:
10 000
- PIC16F616T-ISL PDF datasheet
- PIC16F688T-ISL PDF datasheet #2
- PIC16C770-ISO PDF datasheet #3
- PIC16F873-04SO PDF datasheet #4
- PIC16F873-04SO PDF datasheet #5
- PIC16F873-04SO PDF datasheet #6
- Current page: 70 of 688
- Download datasheet (3Mb)
PICmicro MID-RANGE MCU FAMILY
4.1
DS31004A-page 4-2
Introduction
The high performance of the PICmicro™ devices can be attributed to a number of architectural
features commonly found in RISC microprocessors. These include:
• Harvard architecture
• Long Word Instructions
• Single Word Instructions
• Single Cycle Instructions
• Instruction Pipelining
• Reduced Instruction Set
• Register File Architecture
• Orthogonal (Symmetric) Instructions
Figure 4-2
Harvard Architecture:
Harvard architecture has the program memory and data memory as separate memories and are
accessed from separate buses. This improves bandwidth over traditional von Neumann architec-
ture in which program and data are fetched from the same memory using the same bus. To exe-
cute an instruction, a von Neumann machine must make one or more (generally more) accesses
across the 8-bit bus to fetch the instruction. Then data may need to be fetched, operated on, and
possibly written. As can be seen from this description, that bus can be extremely conjested. While
with a Harvard architecture, the instruction is fetched in a single instruction cycle (all 14-bits).
While the program memory is being accessed, the data memory is on an independent bus and
can be read and written. These separated buses allow one instruction to execute while the next
instruction is fetched. A comparison of Harvard vs. von-Neumann architectures is shown in
Figure
Figure 4-1: Harvard vs. von Neumann Block Architectures
Long Word Instructions:
Long word instructions have a wider (more bits) instruction bus than the 8-bit Data Memory Bus.
This is possible because the two buses are separate. This further allows instructions to be sized
differently than the 8-bit wide data word which allows a more efficient use of the program mem-
ory, since the program memory width is optimized to the architectural requirements.
Single Word Instructions:
Single Word instruction opcodes are 14-bits wide making it possible to have all single word
instructions. A 14-bit wide program memory access bus fetches a 14-bit instruction in a single
cycle. With single word instructions, the number of words of program memory locations equals
the number of instructions for the device. This means that all locations are valid instructions.
Typically in the von Neumann architecture, most instructions are multi-byte. In general, a device
with 4-KBytes of program memory would allow approximately 2K of instructions. This 2:1 ratio is
generalized and dependent on the application code. Since each instruction may take multiple
bytes, there is no assurance that each location is a valid instruction.
Memory
Data
4-1.
shows a simple core memory bus arrangement for Mid-Range MCU devices.
8
Harvard
CPU
14
Program
Memory
von-Neumann
CPU
1997 Microchip Technology Inc.
8
Program
Memory
Data
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