參數(shù)資料
型號： ATAM893T-TKSYD
廠商： Atmel
文件頁數(shù)： 84/98頁
文件大?。?/td> 0K
描述： IC MCU FLASH 4K MTP 20SSOP
標(biāo)準(zhǔn)包裝： 830
系列： MARC4
核心處理器： MARC4
芯體尺寸： 4-位
速度： 4MHz
連通性： SSI（2 線，3 線）
外圍設(shè)備： 欠壓檢測/復(fù)位，POR，PWM，WDT
輸入/輸出數(shù)： 16
程序存儲器容量： 4KB（4K x 8）
程序存儲器類型： EEPROM
EEPROM 大小： 64 x 16
RAM 容量： 256 x 4
電壓 - 電源 (Vcc/Vdd)： 1.8 V ~ 6.5 V
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 125°C
封裝/外殼： 20-SOIC（0.209"，5.30mm 寬）
包裝： 管件
85
4680C–4BMCU–01/05
ATAM893-D
6.1
Serial Interface
The EEPROM uses an MCL-like two-wire serial interface to the microcontroller for read and
write accesses to the data. It is considered to be a slave in all these applications. That means,
the controller has to be the master that initiates the data transfer and provides the clock for
transmit and receive operations.
The serial interface is controlled by the microcontroller which generates the serial clock and con-
trols the access via the SCL-line and SDA-line. SCL is used to clock the data into and out of the
device. SDA is a bi-directional line that is used to transfer data into and out of the device. The
following protocol is used for the data transfers.
6.1.1
Serial Protocol
Data states on the SDA-line changing only while SCL is low
Changes on the SDA-line while SCL is high are interpreted as START or STOP condition
A START condition is defined as a high to low transition on the SDA-line while the SCL-line is
high
A STOP condition is defined as a low to high transition on the SDA-line while the SCL-line is
high
Each data transfer must be initialized with a START condition and terminated with a STOP
condition. The START condition wakes the device from standby mode and the STOP
condition returns the device to standby mode.
A receiving device generates an acknowledge (A) after the reception of each byte. This
requires an additional clock pulse, generated by the master. If the reception was successful
the receiving master or slave device pulls down the SDA-line during that clock cycle. If an
acknowledge is not detected (N) by the interface in transmit mode, it will terminate further
data transmissions and go into receive mode. A master device must finish its read operation
by a non-acknowledge and then send a stop condition to bring the device into a known state.
Figure 6-2.
MCL Protocol
Before the START condition and after the STOP condition the device is in standby mode and
the SDA line is switched as input with pull-up resistor.
The control byte that follows the START condition determines the following operation. It
consists of the 5-bit row address, 2 mode control bits and the READ/NWRITE bit that is used
to control the direction of the following transfer. A 0 defines a write access and a 1 a read
access.
Start
condition
Data
valid
Data
change
Data/
acknowledge
valid
Stop
condition
SCL
SDA
Stand-by
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