參數(shù)資料
型號： AT89LP428-20JU
廠商： Atmel
文件頁數(shù)： 70/149頁
文件大小： 0K
描述： MCU 8051 4K FLASH SPI 32PLCC
產品培訓模塊： MCU Product Line Introduction
標準包裝： 32
系列： 89LP
核心處理器： 8051
芯體尺寸： 8-位
速度： 20MHz
連通性： SPI，UART/USART
外圍設備： 欠壓檢測/復位，POR，PWM，WDT
輸入/輸出數(shù)： 30
程序存儲器容量： 4KB（4K x 8）
程序存儲器類型： 閃存
EEPROM 大小： 512 x 8
RAM 容量： 768 x 8
電壓 - 電源 (Vcc/Vdd)： 2.4 V ~ 5.5 V
振蕩器型： 內部
工作溫度： -40°C ~ 85°C
封裝/外殼： 32-LCC（J 形引線）
包裝： 管件
27
3654A–MICRO–8/09
AT89LP428/828
8.2
Power-down Mode
Setting the Power-down (PD) bit in PCON enters Power-down mode. Power-down mode stops
the oscillator, disables the BOD and powers down the Flash memory in order to minimize power
consumption. Only the power-on circuitry will continue to draw power during Power-down. Dur-
ing Power-down, the power supply voltage may be reduced to the RAM keep-alive voltage. The
RAM contents will be retained, but the SFR contents are not guaranteed once V
CC has been
reduced. Power-down may be exited by external reset, power-on reset, or certain enabled
interrupts.
8.2.1
Interrupt Recovery from Power-down
Three external interrupt sources may be configured to terminate Power-down mode: external
interrupts INT0 (P3.2) and INT1 (P3.3); and the GPI. To wake up by external interrupt INT0 or
INT1, that interrupt must be enabled by setting EX0 or EX1 in IE and must be configured for
level-sensitive operation by clearing IT0 or IT1. Any GPI on Port 1 (GPI
7-0) can also wake up the
device. The GPI pin must be enabled in GPIEN and configured for level-sensitive detection, and
EGP in IE2 must be set in order to terminate Power-down.
When terminating Power-down by an interrupt, two different wake-up modes are available.
When PWDEX in PCON is zero, the wake-up period is internally timed as shown in Figure 8-1.
At the falling edge on the interrupt pin, Power-down is exited, the oscillator is restarted, and an
internal timer begins counting. The internal clock will not be allowed to propagate to the CPU
until after the timer has timed out. After the time-out period, the interrupt service routine will
begin. The time-out period is controlled by the Start-up Timer Fuses (see Table 7-1 on page 25).
The interrupt pin need not remain low for the entire time-out period.
Figure 8-1.
Interrupt Recovery from Power-down (PWDEX = 0)
When PWDEX = “1”, the wake-up period is controlled externally by the interrupt. Again, at
the falling edge on the interrupt pin, power-down is exited and the oscillator is restarted. How-
ever, the internal clock will not propagate until the rising edge of the interrupt pin as shown in
Figure 8-2. The interrupt pin should be held low long enough for the selected clock source to sta-
bilize. After the rising edge on the pin the interrupt service routine will be executed.
PWD
INT1
XTAL1
tSUT
Internal
Clock
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相關代理商/技術參數(shù)
參數(shù)描述
AT89LP428-20MH 功能描述:8位微控制器 -MCU SingleCycle 8051 4K ISP Flash 2.4V 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
AT89LP428-20PU 功能描述:8位微控制器 -MCU SingleCycle 8051 4K ISP Flash 2.4V 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
AT89LP51-20AU 功能描述:8位微控制器 -MCU Single Cycle 8051 4K ISP FL 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
AT89LP51-20JU 功能描述:8位微控制器 -MCU Single Cycle 8051 4K ISP FL 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
AT89LP51-20MU 功能描述:8位微控制器 -MCU Single Cycle 8051 4K ISP FL 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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