23
8018P–AVR–08/10
ATmega169P
7.3
EEPROM Data Memory
The ATmega169P contains 512 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. This section describes the access between the EEPROM and
the CPU, 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 on page 24. A self-timing function,
however, lets the user software detect when the next byte can be written. If the user code con-
tains instructions 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 27 for details on how to avoid problems in
these situations.
In order to prevent unintentional EEPROM writes, a specific write procedure must be followed.
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.
The following procedure should be followed when writing the EEPROM (the order of steps 3 and
4 is not essential). See ”EEPROM Register Description” on page 28 for supplementary descrip-
tion for each register bit:
1.
Wait until EEWE becomes zero.
2.
Wait until SPMEN in SPMCSR becomes zero.
3.
Write new EEPROM address to EEAR (optional).
4.
Write new EEPROM data to EEDR (optional).
5.
Write a logical one to the EEMWE bit while writing a zero to EEWE in EECR.
6.
Within four clock cycles after setting EEMWE, write a logical one to EEWE.
The EEPROM can not be programmed during a CPU write to the Flash memory. The software
must check that the Flash programming is completed before initiating a new EEPROM write.
Step 2 is only relevant if the software contains a Boot Loader allowing the CPU to program the
Flash. If the Flash is never being updated by the CPU, step 2 can be omitted. See ”Boot Loader
programming.
Caution: An interrupt between step 5 and step 6 will make the write cycle fail, since the
EEPROM Master Write Enable will time-out. If an interrupt routine accessing the EEPROM is
interrupting another EEPROM access, the EEAR or EEDR Register will be modified, causing the
interrupted EEPROM access to fail. It is recommended to have the Global Interrupt Flag cleared
during all the steps to avoid these problems.
相关PDF资料
2-1546217-0 TERM BLK RCPT 20POS SIDE 5.08MM
1-1546217-9 TERM BLK RCPT 19POS SIDE 5.08MM
1-1546217-8 TERM BLK RCPT 18POS SIDE 5.08MM
1-1546217-7 TERM BLK RCPT 17POS SIDE 5.08MM
1-1546217-6 TERM BLK RCPT 16POS SIDE 5.08MM
1-1546217-5 TERM BLK RCPT 15POS SIDE 5.08MM
1-1546217-4 TERM BLK RCPT 14POS SIDE 5.08MM
1-1546217-3 TERM BLK RCPT 13POS SIDE 5.08MM
相关代理商/技术参数
ATMEGA169P-16MCU 功能描述:8位微控制器 -MCU AVR 16KB, 512B EE 16MHz 1KB SRAM, 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
ATMEGA169P-16MU 功能描述:8位微控制器 -MCU AVR 16K FLASH 512B EE 1K SRAM LCD ADC 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
ATMEGA169P-16MU SL383 制造商:Atmel Corporation 功能描述:MCU 8BIT ATMEGA RISC 16KB FLASH 3.3V/5V 64PIN MLF - Tape and Reel
ATMEGA169P-16MUR 功能描述:8位微控制器 -MCU AVR LCD 16KB FLSH EE 512B 1KB SRAM-16MHZ 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
ATMEGA169P-8AU 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Microcontroller with 16K Bytes In-System Programmable Flash
ATMEGA169P-8MU 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Microcontroller with 16K Bytes In-System Programmable Flash
ATMEGA169PA 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-bit Microcontroller with 16K Bytes In-System Programmable Flash
ATMEGA169PA_1 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:High Endurance Non-volatile Memory segments