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Technical Summary: PIC12CE673 Microcontroller

1. Overview

The PIC12CE673 is an 8-bit microcontroller from Microchip Technology, designed for embedded control applications. It belongs to the PIC12CE67X family, featuring a high-performance RISC CPU, integrated EEPROM data memory, and a range of peripherals. This device is optimized for low-power operation and compact designs, making it suitable for cost-sensitive and space-constrained applications.

Key highlights of the PIC12CE673 include:

• 8-bit RISC architecture with 35 single-word instructions
• Integrated EEPROM for non-volatile data storage
• On-chip analog-to-digital converter (ADC)
• Timer0 module for real-time clock/counter functionality
• Low-power consumption modes

2. Features

Core Features

• High-performance RISC CPU with 35 instructions
• All single-cycle instructions except for program branches (2 cycles)
• 12-bit wide instructions, 8-bit wide data path
• Operating speed: DC to 4 MHz clock input
• 8-level deep hardware stack

Memory Features

• 1K x 12 words of program memory (Flash/ROM depending on variant)
• 64 bytes of RAM data memory
• 128 bytes of EEPROM data memory
• EEPROM rated for 1,000,000 erase/write cycles

Peripheral Features

• 8-bit real-time clock/counter (Timer0) with 8-bit prescaler
• 4-channel, 8-bit analog-to-digital converter
• 6 I/O pins with individual direction control
• Watchdog Timer (WDT) with its own on-chip RC oscillator

Special Microcontroller Features

• In-Circuit Serial Programming (ICSP)
• Power-on Reset (POR)
• Power-up Timer (PWRT) and Oscillator Start-up Timer (OST)
• Brown-out Reset (BOR)
• Code protection
• Power-saving SLEEP mode

3. Applications

The PIC12CE673 is suitable for a wide range of embedded control applications, including:

• Consumer electronics
• Automotive systems
• Industrial control
• Sensor interfaces
• Power management
• Security systems
• Peripheral control in larger systems
• Battery-powered devices

4. Architectural Overview

The PIC12CE673 features a Harvard architecture with separate program and data buses, allowing simultaneous access to program instructions and data. The CPU contains:

• Working Register (WREG)
• Status Register
• File Select Register (FSR)
• 8-level hardware stack

The ALU performs arithmetic and Boolean functions between data in the W register and any register file. All instructions are single cycle (200 ns @ 20 MHz) except for program branches which take two cycles.

5. Memory Organization

Program Memory

The PIC12CE673 has a 12-bit program counter capable of addressing a 1K x 12 program memory space. The reset vector is at 000h, and the interrupt vector is at 004h.

Data Memory (RAM)

The data memory is partitioned into two areas:

• Special Function Registers (SFRs)
• General Purpose Registers (GPRs)

The RAM is organized as 64 bytes, with the first 12 locations reserved for SFRs.

EEPROM Data Memory

The 128 bytes of EEPROM are addressable through special function registers. The EEPROM is rated for high endurance (1,000,000 erase/write cycles) and data retention of >40 years.

6. I/O Port

The device features 6 I/O pins with the following characteristics:

• Individually programmable as input or output
• High sink/source capability
• Weak pull-ups on all I/O pins (programmable)
• Interrupt-on-change capability

7. Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (VDD): -0.3V to +6.5V
• Input Voltage (VIN): -0.3V to (VDD + 0.3V)
• Storage Temperature: -65°C to +150°C

DC Characteristics

• Operating Voltage Range: 2.0V to 5.5V
• Supply Current (4 MHz, 5V): 2 mA typical
• Supply Current (32 kHz, 3V): 15 µA typical
• Input Low Voltage: 0.15 VDD (max)
• Input High Voltage: 0.25 VDD (min)

AC Characteristics

• Instruction Cycle Time: 1 µs @ 4 MHz
• Timer0 Clock Input Frequency: DC to 20 MHz
• ADC Conversion Time: 20 µs typical

8. Package Information

The PIC12CE673 is available in the following packages:

• 8-pin PDIP (Plastic Dual In-line Package)
• 8-pin SOIC (Small Outline IC)
• 8-pin MSOP (Micro Small Outline Package)

Pin Configuration (8-pin PDIP/SOIC)

• Pin 1: VDD - Positive supply
• Pin 2: GP5/T1CKI/OSC1/CLKIN
• Pin 3: GP4/AN3/T1G/OSC2/CLKOUT
• Pin 4: GP3/MCLR/VPP
• Pin 5: GP2/AN2/T0CKI/INT
• Pin 6: GP1/AN1/ICSPCLK
• Pin 7: GP0/AN0/ICSPDAT
• Pin 8: VSS - Ground

9. Development Support

Microchip provides comprehensive development support for the PIC12CE673 including:

• MPLAB® IDE Integrated Development Environment
• PICkit™ 3 Debug Express
• MPLAB® ICD 3 In-Circuit Debugger
• MPLAB® XC8 C Compiler
• Application notes and code examples

10. Conclusion

The PIC12CE673 offers a cost-effective solution for embedded control applications requiring EEPROM data memory, analog inputs, and timer functions in a small package. Its low-power features make it particularly suitable for battery-operated devices, while its robust peripheral set enables diverse applications across multiple industries.

For complete specifications and detailed timing diagrams, refer to the official Microchip PIC12CE67X datasheet (DS31014A).

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