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UPSD3422 Datasheet(PDF) 135 Page - STMicroelectronics

Part # UPSD3422
Description  Turbo Plus series Fast Turbo 8032 MCU with USB and programmable logic
PDF  300 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UPSD3422 Datasheet(HTML) 135 Page - STMicroelectronics

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Obsolete
Product(s)
- Obsolete
Product(s)
Obsolete
Product(s)
- Obsolete
Product(s)
UPSD3422, UPSD3433, UPSD3434, UPSD3454
I2C interface
135/300
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
Set I2C clock prescaler to determine fSCL
–
SFR S1CON.CR[2:0] = desired SCL freq.
Set bus Start condition sampling
–
SFR S1SETUP[7:0] = number of samples
Fast
Recommended
S1SETUP value
82h
85h
8Bh
90h
93h
Number of samples
3
6
12
17
20
Time between samples
166.6 ns
83.3 ns
41.6 ns
30 ns
25 ns
Total sampled period
500 ns
500 ns
500 ns
510 ns
500 ns
High
Recommended
S1SETUP value
(1)
80
82
83
84
Number of samples
-
1
3
4
5
Time between samples
-
83.3 ns
41.6 ns
30 ns
25 ns
Total sampled period
-
83.3
125 ns
120 ns
125 ns
1.
Not compatible with High Speed I2C.
Table 88.
S1SETUP examples for various I2C bus speeds and oscillator
frequencies (continued)
I2C bus
speed, fSCL
Parameter
Oscillator frequency, fOSC
6 MHz
12 MHz
24 MHz
33 MHz
40 MHz
Obsolete
Product(s)
- Obsolete
Product(s)



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