MC68HC908LK24 MOTOROLA [Motorola, Inc], MC68HC908LK24 Datasheet - Page 325
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MC68HC908LK24
Manufacturer Part Number
MC68HC908LK24
Description
Microcontrollers
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC908LK24.pdf
(465 pages)
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MC68HC908LJ24/LK24 — Rev. 2
MOTOROLA
MMBB — Bus Busy Flag
MMAST — Master Control Bit
MMRW — Master Read/Write
MMBR2–MMBR0 — Baud Rate Select
This flag is set after a start condition is detected (bus busy), and is
cleared when a stop condition (bus idle) is detected.
Reset clears this bit.
This bit is set to initiate a master mode transfer. In master mode, the
module generates a start condition to the SDA and SCL lines,
followed by sending the calling address stored in MMADR.
When the MMAST bit is cleared by MMNAKIF set (no acknowledge)
or by software, the module generates the stop condition to the lines
after the current byte is transmitted.
If an arbitration loss occurs (MMALIF = 1), the module reverts to slave
mode by clearing MMAST, and releasing SDA and SCL lines
immediately.
This bit is cleared by writing "0" to it or by reset.
This bit will be transmitted out as bit 0 of the calling address when the
module sets the MMAST bit to enter master mode. The MMRW bit
determines the transfer direction of the data bytes that follows. When
it is "1", the module is in master receive mode. When it is "0", the
module is in master transmit mode. Reset clears this bit.
These three bits select one of eight clock rates as the master clock
when the module is in master mode.
Since this master clock is derived the CPU bus clock, the user
program should not execute the WAIT instruction when the MMIIC
module in master mode. This will cause the SDA and SCL lines to
hang, as the WAIT instruction places the MCU in wait mode, with CPU
clock is halted. These bits are cleared upon reset.
(See
Freescale Semiconductor, Inc.
For More Information On This Product,
1 = Start condition detected
0 = Stop condition detected or MMIIC is disabled
1 = Master mode operation
0 = Slave mode operation
1 = Master mode receive
0 = Master mode transmit
Table 15-2 . Baud Rate
Multi-Master IIC Interface (MMIIC)
Go to: www.freescale.com
Select.)
Multi-Master IIC Interface (MMIIC)
Multi-Master IIC Registers
Data Sheet
325
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