ASAHI KASEI

[AK6002A/04A/08A]

DAI01E-01

1999/10

- 9 -

 READ Operations

There are three basic read operations: current address read, random read, and sequential read.

Read operations are initiated in the same manner as write operations, with the exception that the

R/W bit of the slave address is set to a one.

It is noted that the ninth clock cycle of the read operation is not a "don't care". To terminate a read

operation, the master must hold SDA HIGH during the ninth clock cycle and then issue a stop

condition.

CURRENT ADDRESS READ

Internally the AK6002A/04A/08A contains an address counter that maintains the address of the last

word accessed, incremented by one. Therefore, if the last access (either a read or write) was to

address n, the next read operation would access data from address n+1.

Upon receipt of the slave address with R/W bit set to one, the AK6002A/04A/08A issues an

acknowledge and transmits the eight bit word. The master will not acknowledge the transfer but

generate a stop condition, and therefore the AK6002A/04A/08A discontinues transmission.

CURRENT ADDRESS READ

RANDOM READ

Random read operations allow the master to access any memory location in a random manner.

"dummy" write operation.

The master issues the start condition, slave address and then the word address it is to read. After

the word address acknowledge, the master immediately reissues the start condition and the slave

AK6002A/04A/08A and then by the eight bit word. The master will not acknowledge the transfer but

generate the stop condition, and therefore the AK6002A/04A/08A discontinues transmission.

RANDOM READ