TC1784
Micro Second Channel (MSC)
User´s Manual
18-7
V1.1, 2011-05
MSC, V1.40
Command Frames
A command frame has two active phase parts, SRL active phase and SRH active phase.
The command frame always starts with a high-level selection bit, independently whether
the selection bit insertion (as defined by bit DSC.ENSELL) is enabled or not. The number
of the bits transmitted during SRL and SRH active phases (except the selection bit) is
defined by bit field DSC.NBC. SRL and SRH are combined to a 32-bit value whose
length can be selected from 0 up to 32 bits. In other words, whenever bits of SRH are
transmitted, they are always preceded by the transmission of the complete SRL content.
During the active phase of a command frame, the enable output signal ENC becomes
active. The enable output signals ENL and ENH remain inactive.
The passive phase of a command frame always has a fixed length of 2
×
t
FCL
. The
diagram shown in
assumes that the FCL clock is only generated during the
active phase of the command frame (OCR.CLKCTRL = 0).
Figure 18-5 Command Frame Layout
Selection Bit
MCT06231
Length defined by DSC.NBC
SRL.0
SRL.15
SRH.15
SRL Active Phase
Passive Phase
SRL.1
SRH.1
FCL
SO
ENC
t
FCL
SRH.0
1
Command Frame
SRH Active Phase
2
t
FCL
Active Phase
1) Interrupt generation possible
1)
Summary of Contents for TC1784
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