MC75 AT Command Set

MC75 AT Command Set
18.7 AT^SSPI
s
Subparameter Bit Hexadecimal Selected function
Interface type D15 - D12 0 I²C bus (default)
Port D11 - D8 0 Internal port
Data transfer rate D7 - D4 0
1
I²C at 100 kbps
I²C at 400 kbps (default)
Protocol D3 - D0 0 ASCII (hex coding)
(num)
I²C: This parameter specifies a delay after a write frame. See Section 18.7.1, Specifying Delay Time for I²C for
further details.
[0] (&F) ...FFFF (Unsigned 16 bit value)
(num)
I²C: This parameter specifies the delay after a read frame. See Section 18.7.1, Specifying Delay Time for I²C for
further details.
[0] (&F) ...FFFF (Unsigned 16 bit value)
18.7.1 Specifying Delay Time for I²C
The following figures are provided to assist you in specifying appropriate values for the parameters
and . All delays are relative to the data transfer rate. To calculate the delay use the formula and the
values given below.
Table 18.2: Values for calculating the delay
Figure 18.1: Formula for calculating the delay
Parameter
Delay value
Master clock
Default data transfer rate
User data transfer rate
Delay_min for Write
Delay_min for Read
Values
Value set with parameter or
13 MHz
400 bps
Value selected with subparameter data transfer rate within ,
for example 100 kbps or 400 kbps
7.4 µs at 100 kbps
2.0 µs at 400 kbps
9.9 µs at 100 kbps
2.6 µs at 400 kbps
MC75_ATC_V01.001 Page 432 of 475 6/2/05
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