參數(shù)資料
型號: PIC16F871-I/L
廠商: Microchip Technology
文件頁數(shù): 80/143頁
文件大?。?/td> 0K
描述: IC MCU FLASH 2KX14 EE 44PLCC
產(chǎn)品培訓模塊: Asynchronous Stimulus
8-bit PIC® Microcontroller Portfolio
標準包裝: 27
系列: PIC® 16F
核心處理器: PIC
芯體尺寸: 8-位
速度: 20MHz
連通性: UART/USART
外圍設(shè)備: 欠壓檢測/復位,POR,PWM,WDT
輸入/輸出數(shù): 33
程序存儲器容量: 3.5KB(2K x 14)
程序存儲器類型: 閃存
EEPROM 大?。?/td> 64 x 8
RAM 容量: 128 x 8
電壓 - 電源 (Vcc/Vdd): 4 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 8x10b
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 44-LCC(J 形引線)
包裝: 管件
產(chǎn)品目錄頁面: 639 (CN2011-ZH PDF)
配用: I3-DB16F871-ND - BOARD DAUGHTER ICEPIC3
AC164309-ND - MODULE SKT FOR PM3 44PLCC
444-1001-ND - DEMO BOARD FOR PICMICRO MCU
2003 Microchip Technology Inc.
DS30569B-page 39
PIC16F870/871
4.5
PORTE and TRISE Register
This section is not applicable to the PIC16F870.
PORTE has three pins, RE0/RD/AN5, RE1/WR/AN6
and RE2/CS/AN7, which are individually configurable
as inputs or outputs. These pins have Schmitt Trigger
input buffers.
I/O PORTE becomes control inputs for the micropro-
cessor port when bit PSPMODE (TRISE<4>) is set. In
this mode, the user must make sure that the
TRISE<2:0> bits are set (pins are configured as digital
inputs). Ensure ADCON1 is configured for digital I/O. In
this mode, the input buffers are TTL.
Register 4-1 shows the TRISE register, which also
controls the parallel slave port operation.
PORTE pins are multiplexed with analog inputs. When
selected as an analog input, these pins will read as '0's.
TRISE controls the direction of the RE pins, even when
they are being used as analog inputs. The user must
make sure to keep the pins configured as inputs when
using them as analog inputs.
FIGURE 4-7:
PORTE BLOCK DIAGRAM
(IN I/O PORT MODE)
Note:
On a Power-on Reset, these pins are
configured as analog inputs.
Data
Bus
WR
PORT
WR
TRIS
RD PORT
Data Latch
TRIS Latch
RD TRIS
Schmitt
Trigger
input
buffer
Q
D
CK
Q
D
CK
QD
EN
I/O pin(1)
Note 1: I/O pins have protection diodes to VDD and VSS.
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