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ADuC7060
Table 101. I2CSCON MMR Bit Designations
Bit
15 to 11
10
9
8
7
6
5
4
3
2
1
0
Name
I2CSTXENI
I2CSRXENI
I2CSSENI
I2CNACKEN
I2CSSEN
I2CSETEN
I2CGCCLR
I2CHGCEN
I2CGCEN
Reserved
I2CSEN
Description
Reserved bits.
Slave transmit interrupt enable bit.
Set this bit to enable an interrupt after a slave transmits a byte.
Clear this interrupt source.
Slave receive interrupt enable bit.
Set this bit to enable an interrupt after the slave receives data.
Clear this interrupt source.
I 2 C stop condition detected interrupt enable bit.
Set this bit to enable an interrupt on detecting a stop condition on the I 2 C bus.
Clear this interrupt source.
I 2 C no acknowledge enable bit.
Set this bit to no acknowledge the next byte in the transmission sequence.
Clear this bit to let the hardware control the acknowledge/no acknowledge sequence.
I 2 C slave SCL stretch enable bit.
Set this bit to 1 to enable clock stretching. When SCL is low, setting this bit forces the device to hold SCL low until
I2CSSEN is cleared. If SCL is high, setting this bit forces the device to hold SCL low after the next falling edge.
Clear this bit to disable clock stretching.
I 2 C early transmit interrupt enable bit.
Setting this bit enables a transmit request interrupt just after the positive edge of SCL during the read bit
transmission.
Clear this bit to enable a transmit request interrupt just after the negative edge of SCL during the read bit
transmission.
I 2 C general call status and ID clear bit.
Writing a 1 to this bit clears the general call status and ID bits in the I2CSSTA register.
Clear this bit at all other times.
Hardware general call enable. When this bit and Bit 2 are set, and having received a general call (Address 0x00)
and a data byte, the device checks the contents of the I2CALT against the receive register. If the contents match,
the device has received a hardware general call. This is used if a device needs urgent attention from a master
device without knowing which master it needs to turn to. This is a “to whom it may concern” call. The ADuC7060
watches for these addresses. The device that requires attention embeds its own address into the message. All
masters listen, and the one that can handle the device contacts its slave and acts appropriately. The LSB of the
I2CALT register should always be written to 1, as per the I 2 C January 2000 bus specification.
General call enable bit. Set this bit to enable the slave device to acknowledge an I 2 C general call, Address 0x00
(write). The device then recognizes a data bit. If it receives a 0x06 (reset and write programmable part of the slave
address by hardware) as teh data byte, the I 2 C interface resets as per the I 2 C January 2000 bus specification. This
command can be used to reset an entire I 2 C system. If it receives a 0x04 (write programmable part of the slave
address by hardware) as the data byte, teh general call interrupt status bit sets on any general call. The user must
take corrective action by reprogramming the device address.
Always set this bit = 0.
I 2 C slave enable bit.
Set by user to enable I 2 C slave mode.
Clear to disable I 2 C slave mode.
Rev. 0 | Page 87 of 100
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