MC44CC373CA Просмотр технического описания (PDF) - Freescale Semiconductor
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MC44CC373CA Datasheet PDF : 28 Pages
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The following rules apply for the sequences of data bytes
for incoming (write) information:
• If an odd number of data bytes are received, the last
one is ignored.
• If nine data bytes are received, the ninth and following
ones are ignored, and the last ACK pulse is sent at the
end of the eighth data byte.
• The optional control register one, most significant and
least significant bytes, OC1M, OC1L, data must
always be sent after the C1,C0 control data without a
stop condition in between.
• The optional control register two, most significant and
least significant bytes, OC2M, OC2L, data must be
sent directly after the OC1M, OC1L data without a
stop condition in between.
• The Control and Frequency information may be sent
as separate I2C write sequences. (Example 1 or
Example 5 followed/preceeded by Example 2).
Table 11. MC44CC373/4 Programming Sequence (Incoming Information)
Example 1
Example 2
Example 3
Example 4
Legacy Devices Data Bytes
STA
CA
C1
C0
STO
STA
CA
FM
FL
STO
STA
CA
C1
C0
FM
FL
STO
STA
CA
FM
FL
C1
C0
STO
MC44CC37xxxxxx Devices using the Option Control Bytes
Example 5
Example 6
STA
CA
C1
C0 OC1M OC1L OC2M OC2L STO
STA
CA
FM
FL
C1
C0 OC1M OC1L OC2M OC2L STO
Abbreviations:
STA = Start condition
CA = Chip Address
FM = Frequency information, most significant (high order) bits
FL = Frequency information, least significant (low order) bits
C1 = Control information, most significant (high order) bits
CO = Control information, least significant (low order) bits
OC1M = Optional Control 1 information, most significant (high order) bits
OC1L= Optional Control 1 information, least significant (low order) bits
OC2M = Optional Control 2 information, most significant (high order) bits
OC2L = Optional Control 2 information, least significant (low order) bits
STO = Stop condition
I2C Read Mode Format
To read back the status data, the read address shown in
Table 10 is sent by the master. The modulator then responds
with an ACK followed by a byte containing status information
on the RF oscillator out-of-frequency range.
MC44CC373
10
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