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UPSD3422 Datasheet(PDF) 127 Page - STMicroelectronics

Part # UPSD3422
Description  Turbo Plus Series Fast Turbo 8032 MCU with USB and Programmable Logic
PDF  293 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UPSD3422 Datasheet(HTML) 127 Page - STMicroelectronics

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uPSD34xx
I2C interface
127/293
Table 62.
S1SETUP examples for various I2C bus speeds and oscillator frequencies
Note:
1
Not compatible with High Speed I2C.
23.13
I2C operating sequences
The following pseudo-code explains hardware control for these I2C functions on the
uPSD34xx:
●
Initialize the Interface
●
Function as Master-Transmitter
●
Function as Master-Receiver
●
Function as Slave-Transmitter
●
Function as Slave-Receiver
●
Interrupt Service Routine
Full C code drivers for the uPSD34xx I2C interface, and other interfaces are available from
the web at www.st.com\psm.
Initialization after a uPSD34xx reset
Ensure pins P3.6 and P3.7 are GPIO inputs
–
SFR P3.7 = 1 and SFR P3.6 = 1
Configure pins P3.6 and P3.7 as I2C
–
SFR P3SFS.6 = 1 and P3SFS.7 = 1
I2C Bus
Speed,
fSCL
Parameter
Oscillator Frequency, fOSC
6 MHz
12 MHz
24 MHz
33 MHz
40 MHz
Standard
Recommended
S1SETUP Value
93h
A7h
CFh
EEh
FFh
Number of Samples
20
40
80
111
128
Time Between
Samples
166.6ns
83.3ns
41.6ns
30ns
25ns
Total Sampled Period
3332ns
3332ns
3332ns
3333ns
3200ns
Fast
Recommended
S1SETUP Value
82h
85h
8Bh
90h
93h
Number of Samples
3
6
12
17
20
Time Between
Samples
166.6ns
83.3ns
41.6ns
30ns
25ns
Total Sampled Period
500ns
500ns
500ns
510ns
500ns
High
Recommended
S1SETUP Value
(Note 1)
80
82
83
84
Number of Samples
-
1345
Time Between
Samples
-
83.3ns
41.6ns
30ns
25ns
Total Sampled Period
-
83.3
125ns
120ns
125ns



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