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参数资料
| 型号： | PIC16F887T-I/PT |
| 厂商： | Microchip Technology |
| 文件页数： | 3/16页 |
| 文件大小： | 0K |
| 描述： | IC PIC MCU FLASH 8KX14 44TQFP |
| 应用说明： | Intro to Capacitive Sensing Appl Notes Layout and Physical Design Appl Note |
| 产品培训模块： | Asynchronous Stimulus |
| 标准包装： | 1,200 |
| 系列： | PIC® 16F |
| 核心处理器： | PIC |
| 芯体尺寸： | 8-位 |
| 速度： | 20MHz |
| 连通性： | I²C，SPI，UART/USART |
| 外围设备： | 欠压检测/复位，POR，PWM，WDT |
| 输入/输出数： | 35 |
| 程序存储器容量： | 14KB（8K x 14） |
| 程序存储器类型： | 闪存 |
| EEPROM 大小： | 256 x 8 |
| RAM 容量： | 368 x 8 |
| 电压 - 电源 (Vcc/Vdd)： | 2 V ~ 5.5 V |
| 数据转换器： | A/D 14x10b |
| 振荡器型： | 内部 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 44-TQFP |
| 包装： | 带卷 (TR) |
| 配用： | DM164125-ND - BOARD DEMO PICDEM TOUCH SENSE 1 |
2009 Microchip Technology Inc.
DS80302F-page 11
PIC16F88X
9.
Module: LP/Timer1 Oscillator Operation
Below 25°C
1-2% of devices experience reduced drive as
temperatures approach -40°C. This will result in a
loss
of
Timer1
counts
or
stopped
Timer1
oscillation.
This can also prevent Timer1 oscillator start-up
under cold conditions.
Work around
Use of low-power crystals properly matched to the
device will reduce the likelyhood of failure. A 1m
Ω
resister between OSC2 and VDD will further
improve the drive strength of the circuit.
Affected Silicon Revisions
PIC16F882
PIC16F883/PIC16F884
PIC16F886/PIC16F887
10. Module: Timer0 and WDT Prescaler
Assignment Spurious Reset
A spurious Reset may occur if the Timer0/
Watchdog Timer (WDT) prescaler is assigned
from the WDT to Timer0 and then back to the
WDT.
Summary
The issue only arises when all of the below
conditions are met:
Timer0 external clock input (TOCKI) is enabled.
The Prescaler is assigned to the WDT, then to
the Timer0 and back to the WDT.
During the assignments, the T0CKI pin is high
when bit TOSE is set, or low when TOSE is
clear.
The 1:1 Prescaler option is chosen.
Description
On a POR, the Timer0/WDT prescaler is assigned
to the WDT.
If the prescaler is reassigned to Timer0 and
Timer0 external clock input (TOCKI) is enabled
then the prescaler would be clocked by a transition
on the TOCKI pin.
On power-up, the TOCKI pin is (by default)
enabled for Timer0 in the OPTION register.
If the T0CKI pin is:
High and Timer0 is configured to transition on a
falling edge (TOSE set), or
Low and Timer0 is configured to transition on a
rising edge (TOSE clear)
Then, if the prescaler is reassigned to the WDT, a
clock pulse to the prescaler will be generated on
the reassignment.
If the prescaler is configured for the 1:1 option, the
clock pulse will incorrectly cause a WDT Time-out
Reset of the device.
Work around
1.
Disable the Timer0 external clock input by
clearing the TOCKI bit in the OPTION
register.
2.
Modify the TOSE bit in the OPTION register to
the opposite configuration for the logic level
on the T0CKI pin.
3.
Select a prescaler rate other than 1:1 and
issue a CLRWDT instruction before switching
to the final prescaler rate.
Affected Silicon Revisions
PIC16F882
PIC16F883/PIC16F884
PIC16F886/PIC16F887
A0
X
A0
X
A2
X
A0
X
A0
X
A2
X
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相关代理商/技术参数 |
参数描述 |
|---|---|
| PIC16F88-E/ML | 功能描述:8位微控制器 -MCU 7KB 368 RAM 16 I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| PIC16F88-E/P | 功能描述:8位微控制器 -MCU 7KB 368 RAM 16 I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| PIC16F88-E/SO | 功能描述:8位微控制器 -MCU 7KB 368 RAM 16 I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| PIC16F88-E/SS | 功能描述:8位微控制器 -MCU 7KB 368 RAM 16 I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| PIC16F88-I/ML | 功能描述:8位微控制器 -MCU 7KB 368 RAM 16 I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
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