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参数资料
| 型号： | AT89S4051-24PC |
| 厂商： | ATMEL CORP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-bit Microcontroller with 2K/4K Bytes Flash |
| 中文描述： | 8-BIT, FLASH, 24 MHz, MICROCONTROLLER, PDIP20 |
| 封装： | 0.300 INCH, MS-001AD, PLASTIC, DIP-20 |
| 文件页数： | 10/45页 |
| 文件大小： | 981K |
| 代理商： | AT89S4051-24PC |
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10
3390C–MICRO–7/05
AT89S2051/S4051
12. Power Saving Modes
The AT89S2051/S4051 supports two power-reducing modes: Idle and Power-down. These
modes are accessed through the PCON register.
12.1
Idle Mode
Setting the IDL bit in PCON enters idle mode. Idle mode halts the internal CPU clock. The CPU
state is preserved in its entirety, including the RAM, stack pointer, program counter, program
status word, and accumulator. The Port pins hold the logical states they had at the time that Idle
was activated. Idle mode leaves the peripherals running in order to allow them to wake up the
CPU when an interrupt is generated. Timer 0, Timer 1, and the UART will continue to function
during Idle mode. The analog comparator is disabled during Idle. Any enabled interrupt source
or reset may terminate Idle mode. When exiting Idle mode with an interrupt, the interrupt will
immediately be serviced, and following RETI, the next instruction to be executed will be the one
following the instruction that put the device into Idle.
P1.0 and P1.1 should be set to “0” if no external pull-ups are used, or set to “1” if external pull-
ups are used.
12.2
Power-down Mode
Setting the PD bit in PCON enters Power-down mode. Power-down mode stops the 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. During Power-down the power supply voltage
may be reduced to the RAM keep-alive voltage. The RAM contents will be retained; however,
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 interrupts.
The user should not attempt to enter (or re-enter) the power-down mode for a minimum of 4 μs
until after one of the following conditions has occurred: Start of code execution (after any type of
reset), or Exit from power-down mode.
12.3
Interrupt Recovery from Power-down
Two external interrupts may be configured to terminate Power-down mode. External interrupts
INT0 (P3.2) and INT1 (P3.3) may be used to exit Power-down. To wake up by external interrupt
INT0 or INT1, the interrupt must be enabled and configured for level-sensitive operation.
When terminating Power-down by an interrupt, two different wake up modes are available.
When PWDEX in CLKREG.2 is zero, the wake up period is internally timed. At the falling edge
on the interrupt pin, Power-down is exited, the is restarted, and an internal timer begins count-
ing. The internal clock will not be allowed to propagate and the CPU will not resume execution
until after the timer has counted for nominally 2 ms. After the timeout period the interrupt service
routine will begin. To prevent the interrupt from re-triggering, the ISR should disable the interrupt
before returning. The interrupt pin should be held low until the device has timed out and begun
executing.
When PWDEX = 1 the wakeup period is controlled externally by the interrupt. Again, at the fall-
ing edge on the interrupt pin, Power-down is exited and the is restarted. However, the internal
clock will not propagate and CPU will not resume execution until the
rising edge
of the interrupt
pin. After the rising edge on the pin, the interrupt service routine will begin. The interrupt should
be held low long enough for the to stabilize.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AT89S4051-24PU | 功能描述:8位微控制器 -MCU 4K FLASH 24MHZ RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| AT89S4051-24SU | 功能描述:8位微控制器 -MCU 4K FLASH 24MHZ RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| AT89S4051-24SUR | 功能描述:8051 89S Microcontroller IC 8-Bit 24MHz 4KB (4K x 8) FLASH 20-SOIC 制造商:atmel 系列:89S 包装:管件 零件状态:有效 核心处理器:8051 核心尺寸:8-位 速度:24MHz 连接性:UART/USART 外设:欠压检测/复位，POR，PWM I/O 数:15 程序存储容量:4KB（4K x 8） 程序存储器类型:闪存 EEPROM 容量:- RAM 容量:256 x 8 电压 - 电源（Vcc/Vdd）:2.7 V ~ 5.5 V 数据转换器:- 振荡器类型:内部 工作温度:-40°C ~ 85°C（TA） 封装/外壳:20-SOIC（0.295"，7.50mm 宽） 供应商器件封装:20-SOIC 标准包装:37 |
| AT89S4D12-12RC | 功能描述:8位微控制器 -MCU Microcontroller RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| AT89S4D12-12RI | 功能描述:8位微控制器 -MCU Microcontroller RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
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