mc68hc912dg128 Freescale Semiconductor, Inc, mc68hc912dg128 Datasheet - Page 280
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mc68hc912dg128
Manufacturer Part Number
mc68hc912dg128
Description
M68hc12 Microcontrollers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC68HC912DG128.pdf
(452 pages)
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Inter-IC Bus
15.5.8 Handshaking
15.5.9 Clock Stretching
Technical Data
280
SCL1
SCL2
SCL
The clock synchronization mechanism can be used as a handshake in
data transfer. Slave devices may hold the SCL low after completion of
one byte transfer (9 bits). In such case, it halts the bus clock and forces
the master clock into wait states until the slave releases the SCL line.
The clock synchronization mechanism can be used by slaves to slow
down the bit rate of a transfer. After the master has driven SCL low the
slave can drive SCL low for the required period and then release it. If the
slave SCL low period is greater than the master SCL low period then the
resulting SCL bus signal low period is stretched.
Freescale Semiconductor, Inc.
For More Information On This Product,
Internal Counter Reset
Go to: www.freescale.com
Figure 15-3. IIC Clock Synchronization
Inter-IC Bus
WAIT
MC68HC912DG128 — Rev 3.0
Start Counting High Period
MOTOROLA
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