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X40626V14I-2.7 Datasheet(PDF) 11 Page - Intersil Corporation

Part # X40626V14I-2.7
Description  Dual Voltage CPU Supervisor with 64K Serial EEPROM
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

X40626V14I-2.7 Datasheet(HTML) 11 Page - Intersil Corporation

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11
FN8119.0
March 28, 2005
Figure 11. Acknowledge Polling Sequence
Serial Read Operations
Read operations are initiated in the same manner as
write operations with the exception that the R/W bit of
the Slave Address Byte is set to one. There are three
basic read operations: Current Address Reads, Ran-
dom Reads, and Sequential Reads.
Current Address Read
Internally the device contains an address counter that
maintains the address of the last word read incre-
mented by one. Therefore, if the last read was to
address n, the next read operation would access data
from address n+1. On power-up, the address in the
address counter is 00H.
Upon receipt of the Slave Address Byte with the R/W bit
set to one, the device issues an acknowledge and then
transmits the eight bits of the Data Byte. The master
terminates the read operation when it does not respond
with an acknowledge during the ninth clock and then
issues a stop condition. Refer to Figure 12 for the
address, acknowledge, and data transfer sequence.
It should be noted that the ninth clock cycle of the read
operation is not a “don’t care.” To terminate a read
operation, the master must either issue a stop condi-
tion during the ninth cycle or hold SDA HIGH during
the ninth clock cycle and then issue a stop condition.
Figure 12. Current Address Read Sequence
ACK
returned?
Issue Slave Address
Byte (Read or Write)
Byte load completed
by issuing STOP.
Enter ACK Polling
Issue STOP
Issue START
NO
YES
Nonvolatile Cycle
complete. Continue
command sequence?
Issue STOP
NO
Continue Normal
Read or Write
Command Sequence
PROCEED
YES
S
t
a
r
t
S
t
o
p
Slave
Address
Data
SDA Bus
Signals from
the Slave
Signals from
the Master
A
C
K
S0
S1
1
10 10 0
X40626


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