Siemens TC63 manual Specifying Delay Time for I²C, DelayOnenum, DelayTwonum

TC63 AT Command Set

19.7 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	I²C at 100 kbps
			1	I²C at 400 kbps (default)
Protocol	D3 - D0		0	ASCII (hex coding)

<delayOne>(num)

I²C: This parameter specifies a delay after a write frame. See Section 19.7.1, Specifying Delay Time for I²C for further details.

[0](&F)...FFFF (Unsigned 16 bit value)

<delayTwo>(num)

I²C: This parameter specifies the delay after a read frame. See Section 19.7.1, Specifying Delay Time for I²C for further details.

[0](&F)...FFFF (Unsigned 16 bit value)

19.7.1Specifying Delay Time for I²C

The following figures are provided to assist you in specifying appropriate values for the parameters <delayOne> and <delayTwo>. All delays are relative to the data transfer rate. To calculate the delay use the formula and the values given below.

	Figure 19.1: Formula for calculating the delay
Table 19.2: Values for calculating the delay
Parameter	Values
Delay value	Value set with parameter <delayOne> or <delayTwo>
Master clock	13 MHz
Default data transfer rate	400 bps
User data transfer rate	Value selected with subparameter data transfer rate within <basicConfigura-
	tion>, for example 100 kbps or 400 kbps
Delay_min for Write	7.4 µs at 100 kbps
	2.0 µs at 400 kbps
Delay_min for Read	9.9 µs at 100 kbps
	2.6 µs at 400 kbps

TC63_ATC_V00.490	Page 451 of 501	5/24/05
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