ASAHI KASEI

[AK93C45B/55B/65B/75B]

DAM04E-01

1999/10

- 6 -

Read

The read instruction is the only instruction which outputs serial data on the DO pin.

Following the Start bit, first Op code and address are decoded, then the data from the selected memory

location is available at the DO pin. A dummy bit (logical "0") precedes the 16-bit data from the selected

memory location. The output data changes are synchronized with the rising edges of the serial clock (SK).

The data in the next address can be read sequentially by continuing to provide clock. The address

automatically cycles to the next higher address after the 16bit data shifted out.

When the highest address is reached, the address counter rolls over to address $00 or $000 allowing the read

cycle to be continued indefinitely.

READ (AK93C45B)

*Address bit A7 becomes a "don't care" for AK93C55B.

READ (AK93C55B/65B)

READ (AK93C75B)