參數(shù)資料
型號: AT89C51RC2-SLSIM
廠商: Atmel
文件頁數(shù): 89/127頁
文件大?。?/td> 0K
描述: IC 8051 MCU FLASH 32K 44PLCC
標準包裝: 27
系列: 89C
核心處理器: 8051
芯體尺寸: 8-位
速度: 60MHz
連通性: SPI,UART/USART
外圍設備: POR,PWM,WDT
輸入/輸出數(shù): 32
程序存儲器容量: 32KB(32K x 8)
程序存儲器類型: 閃存
RAM 容量: 1.25K x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 5.5 V
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
配用: AT89STK-11-ND - KIT STARTER FOR AT89C51RX2
64
AT89C51RB2/RC2
4180E–8051–10/06
Keyboard Interface
The AT89C51RB2/RC2 implements a keyboard interface allowing the connection of a
8 x n matrix keyboard. It is based on 8 inputs with programmable interrupt capability on
both high or low level. These inputs are available as alternate function of P1 and allow to
exit from idle and power-down modes.
The keyboard interfaces with the C51 core through 3 special function registers: KBLS,
the Keyboard Level Selection register (Table 53), KBE, the Keyboard interrupt Enable
register (Table 52), and KBF, the Keyboard Flag register (Table 51).
Interrupt
The keyboard inputs are considered as 8 independent interrupt sources sharing the
same interrupt vector. An interrupt enable bit (KBD in IEN1) allows global enable or dis-
able of the keyboard interrupt (see Figure 23). As detailed in Figure 24 each keyboard
input has the capability to detect a programmable level according to KBLS. x bit value.
Level detection is then reported in interrupt flags KBF. x that can be masked by software
using KBE. x bits.
This structure allows keyboard arrangement from 1 by n to 8 by n matrix and allow
usage of P1 inputs for other purpose.
Figure 23. Keyboard Interface Block Diagram
Figure 24. Keyboard Input Circuitry
Power Reduction Mode
P1 inputs allow exit from idle and power down modes as detailed in Section “Power-
P1:x
KBE. x
KBF. x
KBLS. x
0
1
V
CC
Internal Pull-up
P1.0
Keyboard Interface
Interrupt Request
KBD
IEN1
Input Circuitry
P1.1
Input Circuitry
P1.2
Input Circuitry
P1.3
Input Circuitry
P1.4
Input Circuitry
P1.5
Input Circuitry
P1.6
Input Circuitry
P1.7
Input Circuitry
KBDIT
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AT89C51RC2-SLSUL 功能描述:8位微控制器 -MCU 32kB Flash 1280B RAM 2.7V-5.5V RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
AT89C51RC2-SLSUM 功能描述:8位微控制器 -MCU C51RC2 32K FLASH 5V Com RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
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AT89C51RC-33AU 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:8-bit Microcontroller with 32K Bytes Flash
AT89C51RC-33JC 功能描述:8位微控制器 -MCU Microcontroller RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT