AT89C51ID2-RLTIM【PDF 6/157 页】IC 8051 MCU FLASH 64K 44VQFP

收藏本站

您好，
买卖IC网欢迎您。
请登录
免费注册

买卖IC网

Sheet目录3850

2页 3页 4页 5页 [6页]7页 8页 9页 10页

103

AT89C51ID2

4289C–8051–11/05

Error Conditions

The following flags in the SPSTA signal SPI error conditions:

Mode Fault (MODF)

Mode Fault error in Master mode SPI indicates that the level on the Slave Select (SS)

pin is inconsistent with the actual mode of the device. MODF is set to warn that there

may be a multi-master conflict for system control. In this case, the SPI system is

affected in the following ways:

An SPI receiver/error CPU interrupt request is generated

The SPEN bit in SPCON is cleared. This disables the SPI

The MSTR bit in SPCON is cleared

When SS Disable (SSDIS) bit in the SPCON register is cleared, the MODF flag is set

when the SS signal becomes ’0’.

However, as stated before, for a system with one Master, if the SS pin of the Master

device is pulled low, there is no way that another Master attempts to drive the network.

In this case, to prevent the MODF flag from being set, software can set the SSDIS bit in

the SPCON register and therefore making the SS pin as a general-purpose I/O pin.

Clearing the MODF bit is accomplished by a read of SPSTA register with MODF bit set,

followed by a write to the SPCON register. SPEN Control bit may be restored to its orig-

inal set state after the MODF bit has been cleared.

Write Collision (WCOL)

A Write Collision (WCOL) flag in the SPSTA is set when a write to the SPDAT register is

done during a transmit sequence.

WCOL does not cause an interruption, and the transfer continues uninterrupted.

Clearing the WCOL bit is done through a software sequence of an access to SPSTA

and an access to SPDAT.

Overrun Condition

An overrun condition occurs when the Master device tries to send several data Bytes

and the Slave devise has not cleared the SPIF bit issuing from the previous data Byte

transmitted. In this case, the receiver buffer contains the Byte sent after the SPIF bit was

last cleared. A read of the SPDAT returns this Byte. All others Bytes are lost.

This condition is not detected by the SPI peripheral.

SS Error Flag (SSERR)

A Synchronous Serial Slave Error occurs when SS goes high before the end of a

received data in slave mode. SSERR does not cause in interruption, this bit is cleared

by writing 0 to SPEN bit (reset of the SPI state machine).

Interrupts

Two SPI status flags can generate a CPU interrupt requests:

Table 78. SPI Interrupts

Serial Peripheral data transfer flag, SPIF: This bit is set by hardware when a transfer

has been completed. SPIF bit generates transmitter CPU interrupt requests.

Mode Fault flag, MODF: This bit becomes set to indicate that the level on the SS is

inconsistent with the mode of the SPI. MODF with SSDIS reset, generates receiver/error

CPU interrupt requests. When SSDIS is set, no MODF interrupt request is generated.

Figure 42 gives a logical view of the above statements.

Flag

Request

SPIF (SP data transfer)

SPI Transmitter Interrupt request

MODF (Mode Fault)

SPI Receiver/Error Interrupt Request (if SSDIS = ’0’)

发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

*型号	*数量	厂商	批号	封装

添加更多采购

我的联系方式

相关代理商/技术参数

AT89C51ID2-RLTUM 功能描述:8位微控制器 -MCU C51ID2 64K FLASH 32KHz 3-5.5V 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

AT89C51ID2-SLRIM 功能描述:IC MCU FLASH 8051 64K 5V 44-PLCC RoHS:否类别:集成电路 (IC) >> 嵌入式 - 微控制器，系列:89C 标准包装:1,500 系列:AVR® ATtiny 核心处理器:AVR 芯体尺寸:8-位速度:16MHz 连通性:I²C，LIN，SPI，UART/USART，USI 外围设备:欠压检测/复位，POR，PWM，温度传感器，WDT 输入/输出数:16 程序存储器容量:8KB（4K x 16）程序存储器类型:闪存 EEPROM 大小:512 x 8 RAM 容量:512 x 8 电压 - 电源 (Vcc/Vdd):2.7 V ~ 5.5 V 数据转换器:A/D 11x10b 振荡器型:内部工作温度:-40°C ~ 125°C 封装/外壳:20-SOIC（0.295"，7.50mm 宽）包装:带卷 (TR)

AT89C51ID2-SLRUM 功能描述:8位微控制器 -MCU C51ID2 64K FLASH TWI 32KHz 5V 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

AT89C51ID2-SLSIM 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-bit Flash Microcontroller

AT89C51ID2-SLSUM 功能描述:8位微控制器 -MCU 64K FLASH 32KHz 3.5-5V Ind. 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

AT89C51ID2-SMSIM 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-bit Flash Microcontroller

AT89C51ID2-UM 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-bit Flash Microcontroller

AT89C51RB2 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-bit Microcontroller with 16K/ 32K Bytes Flash

采购需求

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

我的联系方式