ATAM893X-TKHYZ ATMEL [ATMEL Corporation], ATAM893X-TKHYZ Datasheet - Page 87

• Manufacturer Part Number: ATAM893X-TKHYZ
• Description: Flash Version for ATAR080, ATAR090/890 and ATAR092/892
• Manufacturer: ATMEL [ATMEL Corporation]

6.2.2.2
6.2.2.3
6.2.2.4
6.2.2.5
6.2.3
4680C–4BMCU–01/05
Read Operations
Write One Data Byte
Write Two Data Bytes
Write Control Byte Only
Write Control Bytes
A
The EEPROM allows byte-, word- and current address read operations. The read operations are
initiated in the same way as write operations. Every read access is initiated by sending the
START condition followed by the control byte which contains the address and the read mode.
When the device has received a read command, it returns an acknowledge, loads the addressed
word into the read/write buffer and sends the selected data byte to the master. The master has
to acknowledge the received byte if it wants to proceed with the read operation. If two bytes are
read out from the buffer the device increments respectively decrements the word address auto-
matically and loads the buffer with the next word. The read mode bits determines if the low or
high byte is read first from the buffer and if the word address is incremented or decremented for
the next read access. If the memory address limit is reached, the data word address will “roll
over” and the sequential read will continue. The master can terminate the read operation after
every byte by not responding with an acknowledge (N) by issuing a stop condition.
Write low byte first
Byte order
Write high byte first
Byte order
Start
Start
Start
acknowledge; HB: high byte; LB: low byte; R: row address
Control byte
Control byte
Control byte
A
A
A
Data byte 1
Data byte 1
Stop
A4
A4
HB(R)
LB(R)
MSB
MSB
A
A
A3
A3
Stop
Data byte 2
Row address
Row address
A2
A2
HB(R)
LB(R)
A1
A1
A
Stop
A0
A0
C1
C1
ATAM893-D
0
1
C0
C0
1
0
R/NW
R/NW
LSB
LSB
0
0
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