mc68hc908bd48 Freescale Semiconductor, Inc, mc68hc908bd48 Datasheet - Page 184
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mc68hc908bd48
Manufacturer Part Number
mc68hc908bd48
Description
M68hc08 Microcontrollers Microcontroller
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC68HC908BD48.pdf
(288 pages)
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Multi-Master IIC Interface (MMIIC)
14.5.3 Multi-Master IIC Master Control Register (MIMCR)
Data Sheet
184
Address:
MMALIF — Multi-Master Arbitration Lost Interrupt Flag
MMNAKIF — No Acknowledge Interrupt Flag
MMBB — Bus Busy Flag
Reset:
Read:
Write:
Figure 14-3. Multi-Master IIC Master Control Register (MIMCR)
This flag is set when software attempt to set MMAST but the MMBB
has been set by detecting the start condition on the lines or when the
MMIIC is transmitting a "1" to SDA line but detected a "0" from SDA
line in master mode – an arbitration loss. This bit generates an
interrupt request to the CPU if the MMIEN bit in MMCR is also set.
This bit is cleared by writing "0" to it or by reset.
This flag is only set in master mode (MMAST = 1) when there is no
acknowledge bit detected after one data byte or calling address is
transferred. This flag also clears MMAST. MMNAKIF generates an
interrupt request to CPU if the MMIEN bit in MMCR is also set. This
bit is cleared by writing "0" to it or by reset.
This flag is set after a start condition is detected (bus busy), and is
cleared when a stop condition (bus idle) is detected or the MMIIC is
disabled. Reset clears this bit.
1 = Lost arbitration in master mode
0 = No arbitration lost
1 = No acknowledge bit detected
0 = Acknowledge bit detected
1 = Start condition detected
0 = Stop condition detected or MMIIC is disabled
MMALIF
$004A
Bit 7
Multi-Master IIC Interface (MMIIC)
0
MMNAKIF
6
0
MMBB
5
0
MMAST
4
0
MMRW
3
0
MC68HC908BD48
MMBR2
Freescale Semiconductor
2
0
MMBR1
1
0
—
MMBR0
Rev. 2.1
Bit 0
0
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