I5216 Datasheet, PDF (19/83 Pages) Winbond – 8 TO 16 MINUTE VOICE RECORD/PLAYBACK SYSTEM WITH INTEGRATED CODEC

I5216 SERIES
Advanced Information
PRELIMINARY
I²C OPERATION DEFINTIONS
There are many control functions used to operate the I5216. Among them are the following.
READ STATUS COMMAND: The read status command is a read
request from the Host processor to the I5216 without delivering a
Command Byte. The Host supplies all of the clocks (SCL). In each
case, the entity sending the data drives the data line (SDA). The Read
Status Command is executed by the following I²C sequence.
1. Host executes I²C START
Conventions used in I²C Data
Transfer Diagrams
S _{= START Condition}
P _{= STOP Condition}
2. Send Slave Address with R/W bit = “1” (Read) 81h.
3. Slave responds back to Host an Acknowledge (ACK), followed
by 8 bit Status word.
4. Host sends an Acknowledge (ACK) to Slave.
5. Wait for SCL to go HIGH.
6. Slave responds with Upper Address byte of internal address
register.
7. Host sends an ACK to Slave.
8. Wait for SCL to go high.
DATA _{= 8 bit data transfer}
R _{= “1” in the R/W bit}
W
= “0” in the R/W bit
A _{= ACK (Acknowledge)}
N _{= No ACK}
9. Slave responds with Lower Address byte of internal address
register.
10. Host sends a NO ACK to Slave, then executes I²C STOP
SLAVE ADDRESS
= 7 bit Slave
Address
The Box color indicates the
direction of data flow
= Host to Slave (Gray)
Note: The processor could have sent an I²C STOP after the Status
Word data transfer, and thus aborted the transfer of the Address bytes
= Slave to Host (White)
A graphical representation of this operation is found below. See the caption box above for more
explanation.
S SLAVE ADDRESS R A DATA A DATA A DATA N P
Status
High Addr. Low Addr.
Publication Release Date: November 30, 2001
-19
Revision A1