參數(shù)資料
型號(hào): AT89LV55-12PC
廠商: Atmel
文件頁(yè)數(shù): 8/32頁(yè)
文件大?。?/td> 0K
描述: IC 8051 MCU FLASH 20K 40DIP
標(biāo)準(zhǔn)包裝: 10
系列: 89LV
核心處理器: 8051
芯體尺寸: 8-位
速度: 12MHz
連通性: UART/USART
輸入/輸出數(shù): 32
程序存儲(chǔ)器容量: 20KB(20K x 8)
程序存儲(chǔ)器類型: 閃存
RAM 容量: 256 x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 6 V
振蕩器型: 內(nèi)部
工作溫度: 0°C ~ 70°C
封裝/外殼: 40-DIP(0.600",15.24mm)
包裝: 管件
16
0811E–MICRO–9/08
AT89LV55
15. Power-down Mode
In the power-down mode, the oscillator is stopped, and the instruction that invokes power-down
is the last instruction executed. The on-chip RAM and Special Function Registers retain their
values until the power-down mode is terminated. The only exit from power-down is a hardware
reset. Reset redefines the SFRs but does not change the on-chip RAM. The reset should not be
activated before V
CC is restored to its normal operating level and must be held active long
enough to allow the oscillator to restart and stabilize.
Figure 15-1. Oscillator Connections
Note:
C1, C2 = 30 pF
± 10 pF for Crystals
= 40 pF
± 10 pF for Ceramic Resonators
Figure 15-2. External Clock Drive Configuration
Table 15-1.
Status of External Pins During Idle and Power-down Modes
Mode
Program Memory
ALE
PSEN
PORT0
PORT1
PORT2
PORT3
Idle
Internal
1
Data
Idle
External
1
Float
Data
Address
Data
Power-down
Internal
0
Data
Power-down
External
0
Float
Data
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