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Bit
Name
Reset
Access
Description
Software must give one ACK command for each ACK transmitted on the I C bus.
Value
0
1
Description
2
Addresses that are not automatically NACK'ed, and all data is automatically acknowledged.
1
SLAVE
0
RW
Addressable as Slave
Set this bit to allow the device to be selected as an I C slave.
2
Value
0
1
Description
All addresses will be responded to with a NACK
Addresses matching the programmed slave address or the general call address (if enabled) require a response from
software. Other addresses are automatically responded to with a NACK.
I C Enable
0
EN
0
RW
2
Use this bit to enable or disable the I C module.
2
The I C module is disabled. And its internal state is cleared
The I C module is enabled.
Value
0
1
Description
2
2
15.5.2 I2Cn_CMD - Command Register
Offset
0x004
Reset
Access
Name
Bit Position
Bit
Name
Reset
Access
Description
31:8
Reserved
To ensure compatibility with future devices, always write bits to 0. More information in Section 2.1 (p. 3)
7
CLEARPC
0
W1
Clear Pending Commands
Set to clear pending commands.
6
CLEARTX
0
W1
Clear TX
Set to clear transmit buffer and shift register. Will not abort ongoing transfer.
5
ABORT
0
W1
Abort transmission
Abort the current transmission making the bus go idle. When used in combination with STOP, a STOP condition is sent as soon as
possible before aborting the transmission. The stop condition is subject to clock synchronization.
4
CONT
0
W1
Continue transmission
Set to continue transmission after a NACK has been received.
3
NACK
0
W1
Send NACK
Set to transmit a NACK the next time an acknowledge is required.
2
ACK
0
W1
Send ACK
Set to transmit an ACK the next time an acknowledge is required.
1
STOP
0
W1
Send stop condition
Set to send stop condition as soon as possible.
0
START
0
W1
Send start condition
Set to send start condition as soon as possible. If a transmission is ongoing and not owned, the start condition will be sent as soon
as the bus is idle. If the current transmission is owned by this module, a repeated start condition will be sent. Use in combination with
a STOP command to automatically send a STOP, then a START when the bus becomes idle.
2011-04-12 - d0001_Rev1.10
167
www.energymicro.com
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