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参数资料
| 型号： | SC28L92A1B,528 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 13/73页 |
| 文件大小： | 0K |
| 描述： | IC UART DUAL W/FIFO 44PQFP |
| 标准包装： | 1,500 |
| 系列： | IMPACT |
| 特点： | 故障启动位检测 |
| 通道数： | 2，DUART |
| FIFO's： | 16 字节 |
| 电源电压： | 3.3V，5V |
| 带自动流量控制功能： | 是 |
| 带故障启动位检测功能： | 是 |
| 带调制解调器控制功能： | 是 |
| 带CMOS： | 是 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 44-QFP |
| 供应商设备封装： | 44-PQFP（10x10） |
| 包装： | 带卷 (TR) |
| 其它名称： | 935263294528 SC28L92A1B-T SC28L92A1B-T-ND |
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20
2552K–AVR–04/11
ATmega329/3290/649/6490
Figure 7-3.
On-chip Data SRAM Access Cycles
7.3
EEPROM Data Memory
The ATmega329/3290/649/6490 contains 1/2K bytes of data EEPROM memory. It is organized
as a separate data space, in which single bytes can be read and written. The EEPROM has an
endurance of at least 100,000 write/erase cycles. The access between the EEPROM and the
CPU is described in the following, specifying the EEPROM Address Registers, the EEPROM
Data Register, and the EEPROM Control Register.
For a detailed description of SPI, JTAG and Parallel data downloading to the EEPROM, see
7.3.1
EEPROM Read/Write Access
The EEPROM Access Registers are accessible in the I/O space.
The write access time for the EEPROM is given in Table 7-1. A self-timing function, however,
lets the user software detect when the next byte can be written. If the user code contains instruc-
tions that write the EEPROM, some precautions must be taken. In heavily filtered power
supplies, V
CC is likely to rise or fall slowly on power-up/down. This causes the device for some
period of time to run at a voltage lower than specified as minimum for the clock frequency used.
See “Preventing EEPROM Corruption” on page 21. for details on how to avoid problems in these
situations.
In order to prevent unintentional EEPROM writes, a specific write procedure must be followed.
Refer to the description of the EEPROM Control Register for details on this.
When the EEPROM is read, the CPU is halted for four clock cycles before the next instruction is
executed. When the EEPROM is written, the CPU is halted for two clock cycles before the next
instruction is executed.
7.3.2
EEPROM Write During Power-down Sleep Mode
When entering Power-down sleep mode while an EEPROM write operation is active, the
EEPROM write operation will continue, and will complete before the Write Access time has
passed. However, when the write operation is completed, the clock continues running, and as a
clk
WR
RD
Data
Address
Address valid
T1
T2
T3
Compute Address
Read
Wr
ite
CPU
Memory Access Instruction
Next Instruction
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SC28L92A1B557 | 制造商:NXP Semiconductors 功能描述:IC UART W/FIFO DUAL 44PQFP 制造商:NXP Semiconductors 功能描述:IC DUAL UART FIFO 1MBPS 5. |
| SC28L92A1BS | 功能描述:UART 接口集成电路 3V-5V 1CH UART INTEL/MOT INTRF RoHS:否 制造商:Texas Instruments 通道数量:2 数据速率:3 Mbps 电源电压-最大:3.6 V 电源电压-最小:2.7 V 电源电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:LQFP-48 封装:Reel |
| SC28L92A1BS,528 | 功能描述:UART 接口集成电路 3V-5V 1CH UART RoHS:否 制造商:Texas Instruments 通道数量:2 数据速率:3 Mbps 电源电压-最大:3.6 V 电源电压-最小:2.7 V 电源电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:LQFP-48 封装:Reel |
| SC28L92A1BS,551 | 功能描述:UART 接口集成电路 3V-5V 1CH UART RoHS:否 制造商:Texas Instruments 通道数量:2 数据速率:3 Mbps 电源电压-最大:3.6 V 电源电压-最小:2.7 V 电源电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:LQFP-48 封装:Reel |
| SC28L92A1BS,557 | 功能描述:UART 接口集成电路 3V-5V 1CH UART RoHS:否 制造商:Texas Instruments 通道数量:2 数据速率:3 Mbps 电源电压-最大:3.6 V 电源电压-最小:2.7 V 电源电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:LQFP-48 封装:Reel |
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