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CHAPTER 21 400 kHz I2C INTERFACE
21.2.6
Seven Bit Slave Address Mask Register (ISMKn)
The Seven Bit Slave Address Mask Register (ISMKn) contains the seven bit slave address
mask and the seven bit slave address enable bit.
■ Seven Bit Slave Address Mask Register (ISMKn)
This register contains the seven bit slave address mask and the seven bit mode enable bit. Write access to this
register is only possible if the interface is disabled (EN="0" in ICCR).
Figure 21.2-10 Configuration of the Seven Bit Slave Address Mask register (ISMKn)
R/W
:
Readable and writable
■ Seven Bit Slave Address Mask Register (ISMKn) contents
Table 21.2-6 Function of each bit of the Seven Bit Slave Address Mask Register (ISMKn)
Bit name
bit 15
ENSB:
Enable seven bit
slave address bit
bit 14 to 8
SM6 to SM0:
Seven bit slave
address mask bits
562
15
14
13
12
11
SM6 SM5 SM4 SM3 SM2 SM1SM0
ENSB
R/W R/W R/W R/W
R/W
R/W
This bit enables the seven bit slave address (and the acknowledging upon its reception).
"0": Seven bit slave address disabled
"1": Seven bit slave address enabled
This register is used to mask the seven bit slave address of the interface.
"0": Bit is not used in slave address comparison.
"1": Bit is used in slave address comparison.
This can be used to make the interface acknowledge on multiple seven bit slave
addresses. Only the bits set to "1" in this register are used in the seven bit slave address
comparison. The received slave address is written back to the ISBA register and may
thus may be determined by reading the ISBA register if the AAS bit in the IBSR register
is "1".
Note:
If the address mask is changed after the interface has been enabled, the slave address
should also be set again since it could have been overwritten by a previously
received slave address.
MB96300 Super Series Hardware Manual
10
9
8
ISMKn
Initial value
0 1 1 1 1 1 1 1
R/W R/W
Function
B
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