PIC18F27/47Q10系列单片机技术手册：低功耗高性能微控制器

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"PIC18F27/47Q10系列是MICROCHIP公司生产的高性能、低功耗单片机，适用于各种通用和低功耗应用。这些单片机在28/40/44引脚封装中集成了丰富的模拟、核心独立和通信外设，提供高度的设计灵活性和较低的系统成本。" 正文： PIC18F27/47Q10系列单片机是MICROCHIP公司的微控制器产品，主要特点在于其强大的功能集和低功耗特性。这些单片机具备多种核心功能和外围模块，能够满足各种复杂的嵌入式系统需求。 1. **核心特性**： - **RISC架构**：优化的C编译器兼容的精简指令集架构，确保高效执行代码。 - **运行速度**：可支持从直流到64MHz的时钟输入，覆盖整个VDD工作范围，最低指令周期仅为62.5ns，提供了快速的运算能力。 - **中断优先级**：具有可编程的2级中断优先级，确保关键任务的处理。 - **硬件堆栈**：31级深度的硬件堆栈，支持复杂的程序执行。 - **定时器**：包含3个8位定时器（TMR2/4/6），带有硬件限制计数器（HLT）功能，可用于精确的时间控制和计数。 2. **模拟功能**： - **10位ADC**：集成10位模数转换器（ADC），支持计算型电容分压器（CVD）技术，适用于高级触摸感应、平均值计算、滤波、过采样以及自动阈值比较。 3. **核心独立外设**： - **互补波形发生器(CWG)**：可以生成模拟信号，用于电机控制和其他波形生成应用。 - **窗口看门狗定时器(WWDT)**：保证系统的稳定性和可靠性，防止程序陷入死循环。 - **循环冗余校验(CRC)/内存扫描**：用于数据校验和内存健康检查，提高系统的数据完整性。 - **零交叉检测(ZCD)**：在AC信号处理中很有用，例如在开关电源或电机控制中检测电压或电流的零点。 - **配置逻辑单元(CLC)**：用户可以根据需求自定义逻辑功能，实现灵活的系统扩展。 - **外围引脚选择(PPS)**：允许用户根据需要重新分配输入/输出引脚的功能，增加设计灵活性。 4. **应用领域**： - 由于这些特性，PIC18F27/47Q10系列非常适合应用于智能家居、工业自动化、物联网(IoT)设备、便携式电子设备、汽车电子、传感器接口等多种领域。 5. **总结**： PIC18F27/47Q10系列单片机以其高效的RISC架构、强大的模拟和数字外设以及低功耗设计，为开发者提供了极具性价比的选择。其核心独立外设的特性使得系统设计更加灵活，可以应对各种复杂的应用场景，是现代嵌入式系统设计的理想选择。

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Features PIC18F27Q10 PIC18F47Q10

Data Memory (Bytes)

3615 3615

Data EEPROM Memory (Bytes)

1024 1024

I/O Ports A,B,C,E

(1)

A,B,C,D,E

Capture/Compare/PWM Modules (CCP) 2 2

10-Bit Pulse-Width Modulator (PWM) 2 2

10-Bit Analog-to-Digital Module (ADC

)

with Computation Accelerator

4 internal

24 external

4 internal

35 external

Packages

28-pin SPDIP

28-pin SOIC

28-pin SSOP

28-pin VQFN

28-pin QFN

40-pin PDIP

40-pin QFN

44-pin TQFP

Timers (16-/8-bit) 4/3 4/3

Serial Communications

2 MSSP,

2 EUSART

2 MSSP,

2 EUSART

Enhanced Complementary Waveform

Generator (ECWG)

1 1

Zero-Cross Detect (ZCD) 1 1

Data Signal Modulator (DSM) 1 1

Configurable Logic Cell (CLC) 8 8

Peripheral Pin Select (PPS) Yes Yes

Peripheral Module Disable (PMD) Yes Yes

16-bit CRC with NVMSCAN Yes Yes

Programmable High/Low-Voltage Detect

(HLVD)

Yes Yes

Programmable Brown-out Reset (BOR) Yes Yes

Resets (and Delays)

POR, BOR,

RESET Instruction,

Stack Overflow,

Stack Underflow

(PWRT, OST),

MCLR, WDT

POR, BOR,

RESET Instruction,

Stack Overflow,

Stack Underflow

(PWRT, OST),

MCLR, WDT

Instruction Set

75 Instructions;

83 with Extended Instruction Set

enabled

75 Instructions;

83 with Extended Instruction Set

enabled

Operating Frequency DC – 64 MHz DC – 64 MHz

Note 1: PORTE contains the single RE3 read-only bit.

PIC18F27/47Q10

Device Overview

Datasheet

DS40002043E-page 16

1.4 Register and Bit Naming Conventions

1.4.1 Register Names

When there are multiple instances of the same peripheral in a device, the Peripheral Control registers will be depicted

as the concatenation of a peripheral identifier, peripheral instance, and control identifier. The control registers section

will show just one instance of all the register names with an ‘x’ in the place of the peripheral instance number. This

naming convention may also be applied to peripherals when there is only one instance of that peripheral in the device

to maintain compatibility with other devices in the family that contain more than one.

1.4.2 Bit Names

There are two variants for bit names:

• Short name: Bit function abbreviation

• Long name: Peripheral abbreviation + short name

1.4.2.1 Short Bit Names

Short bit names are an abbreviation for the bit function. For example, some peripherals are enabled with the EN bit.

The bit names shown in the registers are the short name variant.

Short bit names are useful when accessing bits in C programs. The general format for accessing bits by the short

name is RegisterNamebits.ShortName. For example, the enable bit, EN, in the CM1CON0 register can be set in C

programs with the instruction CM1CON0bits.EN = 1.

Short names are generally not useful in assembly programs because the same name may be used by different

peripherals in different bit positions. When this occurs, during the include file generation, all instances of that short bit

name are appended with an underscore plus the name of the register in which the bit resides to avoid naming

contentions.

1.4.2.2 Long Bit Names

Long bit names are constructed by adding a peripheral abbreviation prefix to the short name. The prefix is unique to

the peripheral, thereby making every long bit name unique. The long bit name for the COG1 enable bit is the COG1

prefix, G1, appended with the enable bit short name, EN, resulting in the unique bit name G1EN.

Important: The COG1 peripheral is used as an example. Not all devices have the COG peripheral.

Long bit names are useful in both C and assembly programs. For example, in C the COG1CON0 enable bit can be

set with the G1EN = 1 instruction. In assembly, this bit can be set with the BSF COG1CON0,G1EN instruction.

1.4.2.3 Bit Fields

Bit fields are two or more adjacent bits in the same register. Bit fields adhere only to the short bit naming convention.

For example, the three Least Significant bits of the COG1CON0 register contain the Mode Control bits. The short

name for this field is MD. There is no long bit name variant. Bit field access is only possible in C programs. The

following example demonstrates a C program instruction for setting the COG1 to the Push-Pull mode:

COG1CON0bits.MD = 0x5;

Individual bits in a bit field can also be accessed with long and short bit names. Each bit is the field name appended

with the number of the bit position within the field. For example, the Most Significant mode bit has the short bit name

MD2 and the long bit name is G1MD2. The following two examples demonstrate assembly program sequences for

setting the COG1 to Push-Pull mode:

Example 1:

MOVLW ~(1<<G1MD1)

ANDWF COG1CON0,F

MOVLW 1<<G1MD2 | 1<<G1MD0

IORWF COG1CON0,F

PIC18F27/47Q10

Device Overview

Datasheet

DS40002043E-page 18

2. Guidelines for Getting Started with PIC18F27/47Q10 Microcontrollers

2.1 Basic Connection Requirements

Getting started with the PIC18F27/47Q10 family of 8-bit microcontrollers requires attention to a minimal set of device

pin connections before proceeding with development.

The following pins must always be connected:

• All V

and V

pins (see 2.2 Power Supply Pins)

• All V

pins must have a 0.1 uF bypass capacitor to V

These pins must also be connected if they are being used in the end application:

• ICSPCLK/ICSPDAT pins used for In-Circuit Serial Programming

™

(ICSP

™

) and debugging purposes (see 2.4 In-

Circuit Serial Programming (ICSP) Pins)

• OSCI and OSCO pins when an external oscillator source is used (see 2.5 External Oscillator Pins)

•

MCLR pin (see 2.3 Master Clear (MCLR) Pin) when external master clear configuration is selected.

Additionally, the following pins may be required:

• V

REF

+/V

REF

- pins are used when external voltage reference for analog modules is implemented

The minimum mandatory connections are shown in the figure below.

Figure 2-1. Recommended Minimum Connections

Filename: 10-000249C.vsd

Title: Getting Started on PIC18

Last Edit: 5/1/2018

First Used: PIC18FxxQ10

Note: Generic figure showing the MCLR, VDD and VSS pin connections.

Rev. 10-000249C

5/1/2018

VDD

PIC MCU

MCLR

VDD

Vss

Key:

C1: 0.1 F, 20V ceramic (recommended)

R1: 10 kΩ (recommended)

R2: 100Ω to 470Ω (recommended)

C2: 0.1 F, 20V ceramic (required)

2.2 Power Supply Pins

2.2.1 Decoupling Capacitors

The use of decoupling capacitors on every pair of power supply pins (V

and V

) is required.

Consider the following criteria when using decoupling capacitors:

• Value and type of capacitor: A 0.1 μF (100 nF), 10-20V capacitor is required. The capacitor should be a low-

ESR device, with a resonance frequency in the range of 200 MHz and higher. Ceramic capacitors are

recommended.

• Placement on the printed circuit board: The decoupling capacitors should be placed as close to the pins as

possible. It is recommended to place the capacitors on the same side of the board as the device. If space is

constricted, the capacitor can be placed on another layer on the PCB using a via; however, ensure that the trace

length from the pin to the capacitor is no greater than 0.25 inch (6 mm).

PIC18F27/47Q10

Guidelines for Getting Started with PIC18F27/47Q10...

Datasheet

DS40002043E-page 20

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