X24645P Xicor, X24645P Datasheet - Page 8

• Manufacturer Part Number: X24645P
• Description: Advanced 2-Wire Serial E 2 PROM with Block Lock TM Protection
• Manufacturer: Xicor

Figure 9. Sequential Read
Figure 10. Typical System Configuration
Sequential Read
Sequential reads can be initiated as either a current
address read or random access read. The first byte is
transmitted as with the other modes, however, the
master now responds with an acknowledge, indicating
it requires additional data. The X24645 continues to
output data for each acknowledge received. The read
operation is terminated by the master; by not
responding with an acknowledge and then issuing a
stop condition.
X24645
SDA
SCL
BUS ACTIVITY:
MASTER
SDA LINE
BUS ACTIVITY:
X24645
TRANSMITTER/
RECEIVER
MASTER
ADDRESS
SLAVE
RECEIVER
SLAVE
C
A
K
DATA n
TRANSMITTER/
RECEIVER
SLAVE
A
C
K
DATA n+1
8
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 8191), the counter “rolls over” to 0 and the
X24645 continues to output data for each acknowledge
received. Refer to Figure 9 for the address,
acknowledge and data transfer sequence.
TRANSMITTER
MASTER
C
A
K
DATA n+2
TRANSMITTER/
RECEIVER
A
C
K
MASTER
DATA n+x
2783 ILL F13
V CC
PULL-UP
RESISTORS
2783 ILL F14
P
O
S
T
P