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24C01C
8.0
READ OPERATION
8.2
Random Read
Read operations are initiated in the same way as write
operations with the exception that the R/W bit of the
slave address is set to one. There are three basic types
of read operations: current address read, random read
and sequential read.
Random read operations allow the master to access
any memory location in a random manner. To perform
this type of read operation, first the word address must
be set. This is done by sending the word address to the
24C01C as part of a write operation.
8.1
Current Address Read
After the word address is sent, the master generates a
Start condition following the acknowledge. This
The 24C01C contains an address counter that main-
tains the address of the last word accessed, internally
incremented by one. Therefore, if the previous read
access was to address n, the next current address read
operation would access data from address n + 1. Upon
receipt of the slave address with the R/W bit set to one,
the 24C01C issues an acknowledge and transmits the
eight-bit data word. The master will not acknowledge
the transfer, but does generate a Stop condition and the
24C01C discontinues transmission ( Figure 8-1 ).
terminates the write operation, but not before the
internal Address Pointer is set. Then the master issues
the control byte again but with the R/W bit set to a one.
The 24C01C will then issue an acknowledge and trans-
mits the eight bit data word. The master will not
acknowledge the transfer, but does generate a Stop
condition and the 24C01C discontinues transmission
( Figure 8-2 ). After this command, the internal address
counter will point to the address location following the
one that was just read.
FIGURE 8-1:
CURRENT ADDRESS
8.3
Sequential Read
READ
Sequential reads are initiated in the same way as a
Bus Activity
Master
S
T
A
R
T
Control
Byte
Data
S
T
O
P
random read except that after the 24C01C transmits
the first data byte, the master issues an acknowledge
as opposed to a Stop condition in a random read. This
directs the 24C01C to transmit the next sequentially
SDA Line
Bus Activity
S
A
C
K
N
O
A
C
K
P
addressed 8-bit word ( Figure 8-3 ).
To provide sequential reads the 24C01C contains an
internal Address Pointer which is incremented by one
at the completion of each operation. This Address
Pointer allows the entire memory contents to be serially
read during one operation. The internal Address
Pointer will automatically roll over from address 7F to
address 00.
FIGURE 8-2:
RANDOM READ
Bus Activity
Master
SDA Line
Bus Activity
S
T
A
R
T
S
Control
Byte
A
C
K
Word
Address (n)
A
C
K
S
T
A
R
T
S
Control
Byte
A
C
K
Data (n)
N
O
A
C
K
S
T
O
P
P
FIGURE 8-3:
SEQUENTIAL READ
Bus Activity
Master
Control
Byte
Data n
Data n + 1
Data n + 2
Data n + X
S
T
O
P
SDA Line
P
Bus Activity
A
C
K
A
C
K
A
C
K
A
C
K
N
O
A
C
K
? 1997-2012 Microchip Technology Inc.
DS21201K-page 11
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