Rainbow Electronics BR24L01AFVM-W - Manual (Page 15)

BR24L01A-W / BR24L01AF-W / BR24L01AFJ-W /
Memory ICs BR24L01AFV-W / BR24L01AFVM-W
15/25
3) Acknowledge polling
Since the device ignore all input commands during the internal write cycle, no ACK will be returned.
When the master send the next command after the wire command, if the device returns the ACK, it means that the
program is completed. If no ACK id returned, it means that the device is still busy.
By using Acknowledge polling, the waiting time is minimized less than t
WR =5ms.
In case of operating Write or Current Read right after Write, first, send the slave address (R / W is “HIGH” or “LOW”
respectively). After the device returns the ACK, continue word address input or data output respectively.
S
T
A
R
T S
T
A
R
T S
T
A
R
T
S
T
A
R
T S
T
A
R
T
A
C
K
H A
C
K
L
A
C
K
L
A
C
K
L
A
C
K
H A
C
K
H
S
T
O
P
S
T
O
P
WRITE COMMAND
SLAVE
ADDRESS
SLAVE
ADDRESS
SLAVE
ADDRESS
SLAVE
ADDRESS
WORD
ADDRESS DATA
t WR
t WR
Fig.15 SUCCESSIVE WRITE OPERATION BY ACKNOWLEDGE POLLING
During the internal write cycle,
no ACK will be returned.
(ACK
= HIGH)
After the internal write cycle
is completed ACK will be returned
(ACK
= LOW). Then input next
Word Address and data.
THE FIRST WRITE COMMAND
THE SECOND WRITE COMMAND
• • •
• • •