Datasheet > 87C51FA

87C51FA

更新时间： 2024-02-04 17:54:55

品牌	Logo	应用领域
英特尔 - INTEL		微控制器
页数	文件大小	规格书
20页	258K
描述
CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLERS

阅读下载

获取价格

技术参数
数据手册

如果您发现信息不准确，欢迎纠错

87C51FA 技术参数

生命周期：	Active	包装说明：	DIP, DIP40,.6
Reach Compliance Code：	compliant	风险等级：	5.8
位大小：	8	CPU系列：	8051
JESD-30 代码：	R-XDIP-T40	端子数量：	40
最高工作温度：	125 °C	最低工作温度：	-55 °C
封装主体材料：	CERAMIC	封装代码：	DIP
封装等效代码：	DIP40,.6	封装形状：	RECTANGULAR
封装形式：	IN-LINE	电源：	5 V
认证状态：	Not Qualified	RAM（字节）：	256
ROM（单词）：	32768	ROM可编程性：	UVPROM
筛选级别：	38535Q/M;38534H;883B	速度：	12 MHz
子类别：	Microcontrollers	最大压摆率：	45 mA
标称供电电压：	5 V	表面贴装：	NO
技术：	CMOS	温度等级：	MILITARY
端子形式：	THROUGH-HOLE	端子节距：	2.54 mm
端子位置：	DUAL	Base Number Matches：	1

87C51FA 数据手册

8XC51FX

Down is the last instruction executed. The on-chip

RAM and Special Function Registers retain their val-

ues until the Power Down mode is terminated.

On the 8XC51FX either hardware reset or external

interrupt can cause an exit from Power Down. Reset

redefines all the SFRs but does not change the on-

chip RAM. An external interrupt allows both the

SFRs and the on-chip RAM to retain their values.

272322–3

For Ceramic Resonators, contact resonator manufacturer.

30 pF 10 pF for Crystals

C1, C2

To properly terminate Power Down the reset or ex-

ternal interrupt should not be executed before V is

Figure 3. Oscillator Connections

restored to its normal operating level and must be

held active long enough for the oscillator to restart

and stabilize (normally less than 10 ms).

With an external interrupt, INT0 or INT1 must be en-

abled and configured as level-sensitive. Holding the

pin low restarts the oscillator but bringing the pin

back high completes the exit. Once the interrupt is

serviced, the next instruction to be executed after

RETI will be the one following the instruction that put

the device into Power Down.

272322–4

Figure 4. External Clock Drive Configuration

DESIGN CONSIDERATION

Ambient light is known to affect the internal RAM

IDLE MODE

contents during operation. If the 87C51FX appli-

cation requires the part to be run under ambient

lighting, an opaque label should be placed over

the window to exclude light.

The user’s software can invoke the Idle Mode. When

the microcontroller is in this mode, power consump-

tion is reduced. The Special Function Registers and

the onboard RAM retain their values during Idle, but

the processor stops executing instructions. Idle

Mode will be exited if the chip is reset or if an en-

abled interrupt occurs. The PCA timer/counter can

optionally be left running or paused during Idle

Mode.

When the idle mode is terminated by a hardware

reset, the device normally resumes program exe-

cution, from where it left off, up to two machine

cycles before the internal reset algorithm takes

control. On-chip hardware inhibits access to inter-

nal RAM in this event, but access to the port pins

is not inhibited. To eliminate the possibility of an

unexpected write when Idle is terminated by re-

set, the instruction following the one that invokes

Idle should not be one that writes to a port pin or

to external memory.

POWER DOWN MODE

To save even more power, a Power Down mode can

be invoked by software. In this mode, the oscillator

is stopped and the instruction that invoked Power

Table 2. Status of the External Pins during Idle and Power Down

Program

Memory

Mode

Idle

ALE

PSEN

PORT0

PORT1

PORT2

PORT3

Internal

External

Internal

External

Data

Float

Data

Float

Data

Address

Data

Idle

Power Down

Data

NOTE:

For more detailed information on the reduced power modes refer to current Embedded Microcontrollers and Processors

Handbook Volume I, and Application Note AP-252 (Embedded Applications Handbook), ‘‘Designing with the 80C51BH.’’

1...3 4 567 8 9...20

下载PDF

与87C51FA相关器件

型号	品牌	描述	获取价格	数据表
87C51FA-1	INTEL	Microcontroller,	获取价格
87C51FA-33	INTEL	Microcontroller,	获取价格
87C51FB	INTEL	CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLERS	获取价格
87C51FB	NXP	80C51 8-bit microcontroller family 8K.64K/256.1K OTP/ROM/ROMless, low voltage 2.7V.5.5V, l	获取价格
87C51FC	NXP	80C51 8-bit microcontroller family 8K.64K/256.1K OTP/ROM/ROMless, low voltage 2.7V.5.5V, l	获取价格
87C51FC	INTEL	CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLERS	获取价格

产品中心

服务支持

精选活动

关于我们

帮助中心

87C51FA

87C51FA 技术参数

87C51FA 数据手册

与87C51FA相关器件

与87C51FA相关文章

您还可以找

产品中心

服务支持

精选活动

关于我们

帮助中心

87C51FA

87C51FA 技术参数

87C51FA 数据手册

与87C51FA相关器件

与87C51FA相关文章

您还可以找

您在本页遇到什么问题？