24C16 데이터 시트보기 (PDF) - Turbo IC Inc
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24C16 Datasheet PDF : 8 Pages
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Turbo IC, Inc.
24C16
CURRENT ADDRESS READ:
The internal memory address counter of the Turbo IC 24C16
contains the last memory address accessed during the pre-
vious read or write operation, incremented by one. To start
the current address read operation, the master issues a start
condition, followed by the device address byte 1010 (B10)
(B9) (B8) 1. The Turbo IC 24C16 responds with an acknowl-
edge by pulling the SDA bus low, and then serially shifts out
the data byte accessed from memory at the location corre-
sponding to the memory address counter. The master does
not acknowledge, then sends a stop condition to terminate
the read operation. It is noted that the memory address
counter is incremented by one after the data byte is shifted
out.
RANDOM ADDRESS READ:
The master starts with a dummy write operation (one with no
data bytes) to load the internal memory address counter by
first issuing a start condition, followed by the device address
byte 1010 (B10) (B9) (B8) 0, followed by the memory ad-
dress bytes. Following the acknowledge from the Turbo IC
24C16, the master starts the current read operation by issu-
ing a start condition, followed by the device address byte
1010 (B10) (B9) (B8) 1. The Turbo IC 24C16 responds with
an acknowledge by pulling the SDA bus low, and then seri-
ally shifts out the data byte accessed from memory at the
location corresponding to the memory address counter. The
master does not acknowledge, then sends a stop condition
to terminate the read operation. It is noted that the memory
address counter is incremented by one after the data byte is
shifted out.
SEQUENTIAL READ:
The sequential read is initiated by either a current address
read or random address read. After the Turbo IC 24C16 seri-
ally shifts out the first data byte, the master acknowledges
by pulling the SDA bus low, indicating that it requires addi-
tional data bytes. After the data byte is shifted out, the Turbo
IC 24C16 increments the memory address counter by one.
Then the Turbo IC 24C16 shifts out the next data byte. The
sequential reads continues for as long as the master keeps
acknowledging. When the memory address counter is at the
last memory location, the counter will ‘roll-over’ when
incremented by one to the first location in memory (address
zero). The master terminates the sequential read operation
by not acknowledging, then sends a stop condition.
Current Address Read
S
T
R
A
E
R DEVICE A
T ADDRESS D
SDA LINE
M
L RA
S
S /C
B
B WK
S
T
O
DATA
P
N
O
A
C
K
Random Read
S
W
T
R
A
I
R DEVICE T
T ADDRESS E
WORD
ADDRESS N
//
R
E
DEVICE
A
ADDRESS D
SDA LINE
//
M
L RA
A
A
S
S /C
C
C
B
B WK
K
K
DUMMY WRITE
S
T
O
DATA n
P
N
O
A
C
K
6
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