X24012
The data output is sequential, with the data from address n
followed by the data from n + 1. The address counter
for read operations increments all address bits, allowing the
entire memory contents to be serially read during
one operation. At the end of the address space (address 127),
the counter “rolls over” to address 0 and the
X24012 continues to output data for each acknowledge
received. Refer to Figure 9 for the address, acknowledge
and data transfer sequence.
Sequential Read
Sequential Read can be initiated as either a current
address read or random access read. The first word is
transmitted as with the other modes, however, the
master now responds with an acknowledge, indicating it
requires additional data. The X24012 continues to out- put
data for each acknowledge received. The read
operation is terminated by the master, by not responding with
an acknowledge and by issuing a stop condition.
Figure 9. Sequential Read
BUS ACTIVITY:
MASTER
SLAVE
ADDRESS
A
C
A
C
A
C
S
T
O
P
K
K
K
SDA LINE
BUS ACTIVITY:
X24012
P
A
C
K
DATA n
DATA n+1
DATA n+2
DATA n+x
3847 FHD F14
Figure 10. Typical System Configuration
V
CC
SDA
SCL
MASTER
TRANSMITTER/
RECEIVER
SLAVE
RECEIVER
SLAVE
TRANSMITTER/
RECEIVER
MASTER
TRANSMITTER
MASTER
TRANSMITTER/
RECEIVER
3847 FHD F15
8
ICMIC [ IC MICROSYSTEMS ]
