CAT1641 Catalyst Semiconductor, CAT1641 Datasheet - Page 11

• Manufacturer Part Number: CAT1641
• Description: Voltage Supervisor With I?c Serial 64k Cmos Eeprom
• Manufacturer: Catalyst Semiconductor

Acknowledge Polling
Figure 10. Immediate Address Read Timing
Disabling of the inputs can be used to take advantage of
the typical write cycle time. Once the stop condition is
issued to indicate the end of the host’s write opration, the
CAT1640/41 initiates the internal write cycle. ACK polling
can be initiated immediately. This involves issuing the
start condition followed by the slave address for a write
operation. If the device is still busy with the write operation,
no ACK will be returned. If a write operation has
completed, an ACK will be returned and the host can
then proceed with the next read or write operation.
Advance Information
SDA
SCL
BUS ACTIVITY:
SDA LINE
MASTER
DATA OUT
8TH BIT
8
S
S
A
R
T
T
ADDRESS
SLAVE
11
Read Operations
The READ operation for the CAT1640/41 is initiated in
the same manner as the write operation with one
exception, that R/W bit is set to one. Three different
READ operations are possible: Immediate/Current
Address READ, Selective/Random READ and
Sequential READ.
9
C
A
K
NO ACK
DATA
N
O
C
A
K
P
O
S
T
P
CAT1640, CAT1641
STOP
Doc No. MD-3012, Rev. B