參數(shù)資料
型號(hào): AT89LP214-20XU
廠商: Atmel
文件頁(yè)數(shù): 18/98頁(yè)
文件大?。?/td> 0K
描述: MCU 8051 2K FLASH 20MHZ 14-TSSOP
產(chǎn)品培訓(xùn)模塊: MCU Product Line Introduction
標(biāo)準(zhǔn)包裝: 95
系列: 89LP
核心處理器: 8051
芯體尺寸: 8-位
速度: 20MHz
連通性: SPI,UART/USART
外圍設(shè)備: 欠壓檢測(cè)/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 12
程序存儲(chǔ)器容量: 2KB(2K x 8)
程序存儲(chǔ)器類型: 閃存
RAM 容量: 128 x 8
電壓 - 電源 (Vcc/Vdd): 2.4 V ~ 5.5 V
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 14-TSSOP(0.173",4.40mm 寬)
包裝: 管件
25
3538E–MICRO–11/10
AT89LP213/214
Figure 13-1. Quasi-bidirectional Output
13.1.2
Input-only Mode
The input only port configuration is shown in Figure 13-2. The output drivers are tristated. The
input includes a Schmitt-triggered input for improved input noise rejection. The input circuitry of
P1.3, P3.2 and P3.3 is not disabled during Power-down (see Figure 13-3). Input pins can be
safely driven to 5.5V even when operating at lower V
CC levels; however, the input threshold of
the Schmitt trigger will be set by the V
CC level and must be taken into consideration.
Figure 13-2. Input Only
Figure 13-3. Input Only for P1.3, P3.2 and P3.3
13.1.3
Open-drain Output
The open-drain output configuration turns off all pull-ups and only drives the pull-down transistor
of the port pin when the port latch contains a logic “0”. To be used as a logic output, a port con-
figured in this manner must have an external pull-up, typically a resistor tied to V
CC. The pull-
down for this mode is the same as for the quasi-bidirectional mode. The open-drain port configu-
ration is shown in Figure 13-4.The input circuitry of P1.3, P3.2 and P3.3 is not disabled during
Power-down (see Figure 13-3). Open-drain pins can be safely pulled high to 5.5V even when
operating at lower V
CC levels; however, the input threshold of the Schmitt trigger will be set by
the V
CC level and must be taken into consideration.
1 Clock Delay
(D Flip-Flop)
Strong
Very
Weak
Port
Pin
VCC
From Port
Register
Input
Data
PWD
Port
Pin
Input
Data
PWD
Port
Pin
Input
Data
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