ISD5100 – SERIES
7.3.1.2. Load Command Byte Register (Single Byte Load):
A single byte may be written to the Command Byte Register in order to power up the device, start
or stop Analog Record (if no address information is needed), or do a Message Cueing function.
The Command Byte Register is loaded as follows:
S
SLAVE ADDRESS
W
A
DATA
A
P
1. Host executes I2C START
2. Send Slave Address with R/W bit = “0” (Write) [80h]
3. Slave responds back with an ACK.
4. Wait for SCL to go HIGH
Command Byte
5. Host sends a command byte to Slave
6. Slave responds with an ACK
7. Wait for SCL to go HIGH
8. Host executes I2C STOP
7.3.1.3. Load Command Byte Register (Address Load)
For the normal addressed mode the Registers are loaded as follows:
1. Host executes I2C START
2. Send Slave Address with R/W bit = “0” (Write)
3. Slave responds back with an ACK.
4. Wait for SCL to go HIGH
5. Host sends a byte to Slave - (Command Byte)
6. Slave responds with an ACK
7. Wait for SCL to go HIGH
8. Host sends a byte to Slave - (High Address Byte)
9. Slave responds with an ACK
10. Wait for SCL to go HIGH
11. Host sends a byte to Slave - (Low Address Byte)
12. Slave responds with an ACK
13. Wait for SCL to go HIGH
14. Host executes I2C STOP
S
SLAVE ADDRESS
W
DATA
DATA
DATA
P
Command
High Addr.
Low Addr.
Publication Release Date: October, 2003
Revision 0.2
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