參數(shù)資料
型號(hào)： T48C893-TK
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： The multiple times programmable (MTP) version for the MARC4 ROM types
中文描述： 4-BIT, FLASH, 4 MHz, MICROCONTROLLER, PDSO20
封裝： SSO-20
文件頁(yè)數(shù)： 74/82頁(yè)
文件大?。?/td> 638K
代理商： T48C893-TK
T48C893
Rev. A4, 22-Jan-02
74 (82)
5.1.1
EEPROM
The EEPROM has a size of 2
as 32 x 16-bit matrix each. To read and write data to and
from the EEPROM the serial interface must be used. The
interface supports one and two byte write accesses and
one to n-byte read accesses to the EEPROM.
512 bits and is organized
EEPROM
–
Operating Modes
The operating modes of the EEPROM are defined via the
control byte. The control byte contains the row address,
the mode control bits and the read/not-write bit that is
used to control the direction of the following transfer. A
”
0
”
defines a write access and a
”
1
”
a read access. The
five address bits select one of the 32 rows of the EEPROM
memory to be accessed. For all accesses the complete
16-bit word of the selected row is loaded into a buffer. The
buffer must be read or overwritten via the serial interface.
The two mode control bits C1 and C2 define in which or-
der the accesses to the buffer are performed: High byte
–
low byte or low byte
–
high byte. The EEPROM also sup-
ports autoincrement and autodecrement read operations.
After sending the start address with the corresponding
mode, consecutive memory cells can be read row by row
without transmission of the row addresses.
Write One Data Byte
Two special control bytes enable the complete
initialization of EEPROM with
”
0
”
or with
”
1.
Write Operations
The EEPROM permits 8-bit and 16-bit write operations.
A write access starts with the START condition followed
by a write control byte and one or two data bytes from the
master. It is completed via the STOP condition from the
master after the acknowledge cycle.
The programming cycle consists of an erase cycle (write
”
zeros
”
) and the write cycle (write
”
ones
”
). Both cycles
together take about 10 ms.
Acknowledge Polling
If the EEPROM is busy with an internal write cycle, all
inputs are disabled and the EEPROM will not
acknowledge until the write cycle is finished. This can be
used to detect the end of the write cycle. The master must
perform acknowledge polling by sending a start condition
followed by the control byte. If the device is still busy
with the write cycle, it will not return an acknowledge and
the master has to generate a stop condition or perform fur-
ther acknowledge polling sequences. If the cycle is
complete, it returns an acknowledge and the master can
proceed with the next read or write cycle.
áááááááááááááááááááá
ááááááááááááááá
áááááááááá
Write Two Data Bytes
ááááááááááááááááááááááááá
áááááááááááááááááá
ááááááá
áááááá
áááááááááááááááá
ááááááááá
ááááááááááááááááááááá
ááááááááá
áááááááááááááááááááááááá
áááááááááááááááááááá
ááááááááááááááááááááá
ááááááááááááááááááááá
ááááááááááááááááááááá
áááááááááááááá
Control byte
ááááá
áááááááá
Write low byte first
Control byte
A
Data byte 1
áááááááá
áááá
ááááááááááááá
áááááááááááááááá
áááááááááááá
Data byte 2
ááááá
A
Stop
áááá
áááá
Start
áááááááá
A
A
Stop
áááááááááááááááá
MSB
A4
áááááá
A2
Row address
A1
A0
áááááááááá
áááááááááá
áááááááááá
C1
áááááááááá
0
áááááááááá
áááááááááá
áááááááááá
áááááááááá
áááááááááá
áááááááááá
áááááááááá
C0
1
LSB
R/NW
0
ááááááááááááááááááááá
ááááááááááááááááááááá
A3
LB(R)
HB(R)
áá
áá
áá
áááá
ááááááááááááááááááááááááááááááá
áááááááá
相關(guān)PDF資料
PDF描述
T48C893-TKQ The multiple times programmable (MTP) version for the MARC4 ROM types
T500 DIL 14 PIN SINGLE OUTPUT
T500 Phase Control SCR (40-80 Amperes (63-125 RMS) 1600 Volts)
T5015 TELECOMMUNICATIONS PRODUCTS
T5002 TELECOMMUNICATIONS PRODUCTS
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
T48C893-TKQ 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:The multiple times programmable (MTP) version for the MARC4 ROM types
T48D 制造商:WELWYN 制造商全稱:Welwyn Components Limited 功能描述:High Voltage Precision Thick Film Resistors
T48DH-100MFI 制造商:TT Electronics / Welwyn 功能描述:RESISTOR 100 MEG OHM 1%
T48DH-150MFI 制造商:TT Electronics / Welwyn 功能描述:RESISTOR 150 MEG OHM 1%
T48DH-220MFI 制造商:TT Electronics / Welwyn 功能描述:RESISTOR 220 MEG OHM 1%
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*