參數(shù)資料
型號: AT89C5131A-PUTIM
廠商: Atmel
文件頁數(shù): 161/176頁
文件大?。?/td> 0K
描述: IC 8051 MCU FLASH 32K USB 32QFN
標(biāo)準(zhǔn)包裝: 260
系列: AT89C513x
核心處理器: C52X2
芯體尺寸: 8-位
速度: 48MHz
連通性: I²C,SPI,UART/USART,USB
外圍設(shè)備: LED,POR,PWM,WDT
輸入/輸出數(shù): 18
程序存儲器容量: 32KB(32K x 8)
程序存儲器類型: 閃存
EEPROM 大?。?/td> 4K x 8
RAM 容量: 1.25K x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 5.5 V
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 32-VQFN 裸露焊盤
包裝: 托盤
配用: AT89STK-10-ND - KIT EVAL APPL MASS STORAGE
AT89STK-05-ND - KIT STARTER FOR AT89C5131
84
AT89C5131
4136C–USB–04/05
Keyboard Interface
Introduction
The AT89C5131 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 an alternate function of P1 and allow to
exit from idle and power down modes.
Description
The keyboard interface communicates with the C51 core through 3 special function reg-
isters: KBLS, the Keyboard Level Selection register (Table 71), KBE, The Keyboard
interrupt Enable register (Table 70), and KBF, the Keyboard Flag register (Table 69).
Interrupt
The keyboard inputs are considered as 8 independent interrupt sources sharing the
same interrupt vector. An interrupt enable bit (KBD in IE1) allows global enable or dis-
able of the keyboard interrupt (see Figure 37). As detailed in Figure 38 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 allow keyboard arrangement from 1 by n to 8 by n matrix and allow usage
of P1 inputs for other purpose.
Figure 37. Keyboard Interface Block Diagram
Figure 38. Keyboard Input Circuitry
P1.0
Keyboard Interface
Interrupt Request
KBD
IE1.0
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
P1:x
KBE.x
KBF.x
KBLS.x
0
1
Vcc
Internal Pull-up
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