mc68hc908bd48 Freescale Semiconductor, Inc, mc68hc908bd48 Datasheet - Page 183

• Manufacturer Part Number: mc68hc908bd48
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

14.5.2 Multi-Master IIC Control Register (MMCR)
MC68HC908BD48
Freescale Semiconductor
—
Rev. 2.1
Address:
MMEN — Multi-Master IIC Enable
MMIEN — Multi-Master IIC Interrupt Enable
MMTXAK — Transmit Acknowledge Enable
Reset:
Read:
Write:
This bit is set to enable the Multi-master IIC module. When
MMEN = 0, module is disabled and all flags will restore to its power-
on default states. Reset clears this bit.
When this bit is set, the MMTXIF, MMRXIF, MMALIF, and MMNAKIF
flags are enabled to generate an interrupt request to the CPU. When
MMIEN is cleared, the these flags are prevented from generating an
interrupt request. Reset clears this bit.
This bit is set to disable the MMIIC from sending out an acknowledge
signal to the bus at the 9th clock bit after receiving 8 data bits. When
MMTXAK is cleared, an acknowledge signal will be sent at the 9th
clock bit. Reset clears this bit.
1 = MMIIC module enabled
0 = MMIIC module disabled
1 = MMTXIF, MMRXIF, MMALIF, and/or MMNAKIF bit set will
0 = MMTXIF, MMRXIF, MMALIF, and/or MMNAKIF bit set will not
1 = MMIIC does not send acknowledge signals at 9th clock bit
0 = MMIIC sends acknowledge signal at 9th clock bit
Figure 14-2. Multi-Master IIC Control Register (MMCR)
MMEN
$004C
Bit 7
generate interrupt request to CPU
generate interrupt request to CPU
Multi-Master IIC Interface (MMIIC)
0
= Unimplemented
MMIEN
6
0
5
0
0
4
0
0
MMTXAK
3
0
Multi-Master IIC Interface (MMIIC)
2
0
0
1
0
0
Data Sheet
Bit 0
0
0
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