ASAHI KASEI

[AK6420A/40A/80A]

DAS01E-00

1999/05

- 6 -

Write

The write instruction is followed by 16 bits of data to be written into the specified address. After the 32nd

rising edge of SK to read D0 in, the AK6420A/40A/80A will be put into the automatic write time-out period.

During the automatic write time-out period (Busy status)and while entering write instruction, the RESET pin

should be low level. If the RESET pin is set to high level during the automatic write time-out period, the

AK6420A/40A/80A stops execution of internal programming and the device returns to ready status. In this

case the word data of the specified address will be incomplete. When inputting the new instruction after

RESET, the CS should be set to high level. When the RESET pin is kept at high level, the write is not

executed. This becomes write protection function.

The CS pin need not be high level during automatic write time-out period (BUSY status).