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參數(shù)資料
| 型號： | M44C890 |
| 廠商： | ATMEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | Low-Current Microcontroller for Wireless Communication |
| 中文描述： | 4-BIT, MROM, 4 MHz, MICROCONTROLLER, PDSO20 |
| 封裝： | SSO-20 |
| 文件頁數(shù)： | 52/63頁 |
| 文件大?。?/td> | 503K |
| 代理商： | M44C890 |
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M44C890
M44C090
Rev.A4, 14-Dec-01
52 (63)
4.1.2
EEPROM
The EEPROM has a size of 512 bits and is organized as
32 x 16-bit matrix. 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.
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.
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Write Two Data Bytes
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Control byte
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Write low byte first
Control byte
A
Data byte 1
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Data byte 2
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A
Stop
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Start
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A
A
Stop
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MSB
A4
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A2
Row address
A1
A0
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C1
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0
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C0
1
LSB
R/NW
0
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A3
LB(R)
HB(R)
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