ISD5216PI datasheet(44/75 Pages) WINBOND

44 / 75 page

ISD5216

- 44 -

7.10.6. Digital Erase

1. Host executes I

2C START.

2. Send Slave Address with /W bit = “0” (Write).

3. Send Digital Erase command (d1h)

4. Send high address byte (00h)

Send low address byte (a0h) - erase row 5 in this example. Erase operations must be

addressed on a page boundary.

The 5 LSB bits of the Low Address Byte will be

ignored.

6. Host executes I

2C STOP.

7. Wait until the desired number of pages have been erased. There will be a pulse on the RAC

pin for each page that is erased. After the stop command (described below) has been

received, erasing will stop at the end of the page currently being erased. To erase one page

only, issue the stop command immediately after the start erase command.

8. Host executes I

2C START.

9. Send Slave Address with /W bit = “0” (Write).

10. Send the Stop command (c0h).

11. Host executes I

2C STOP

SLAVE ADDRESS

Command Byte

D1h

DATA

High Addr. Byte

Low Addr. Byte

SLAVE ADDRESS

Command Byte

80h

Erase starts on falling

edge of Slave

acknowledge

Note 2

"N" RAC cycles

Note 3.

Last erased row

Note 4.

Notes:

2C bus is released while erase proceeds. Other devices may use the bus until it is

time to execute the STOP command that causes the end of the Erase operation.

Host processor must count RAC cycles to determine where the chip is in the erase

process, one row per RAC cycle.

RAC pulses LOW for 0.25 microsecond at the end of

each erased row.

The erase of the “next” row begins with the rising edge of RAC.

See the Digital Erase RAC timing diagram on page 46.

4.When the erase of the last desired row begins, the following STOP command

(Command Byte = 80 hex) must be issued.

This command must be completely given,

including receiving the ACK from the Slave before the RAC pin goes HIGH .25

microseconds before the end of the row.

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