Hitachi H8/3937 Series Hardware Manual page 361

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Roaming Status Packet. This bit is set by the host, and cleared by the FLEX decoder once it has
been processed. If the time comes for the FLEX decoder to warm up automatically or the SAS bit
is set while an SND is being processed, the noise detect will be abandoned and the abandoned
noise detect result (NDR = 01) will be sent in the Roaming Status Packet. (value after reset=0)
CND: Continuous Noise Detect. Setting this bit will cause the FLEX decoder to do continuous
noise detects during the decoded block data of a frame. The results of the noise detect will only be
reported if noise is detected (NDR = 11). Only one noise detected result (NDR=11) will be sent
per block. If the FLEX decoder has not completed a noise detect when it shuts down for the frame,
that noise detect will be abandoned, but no abandon result (NDR=01) will be sent. This bit is set
and cleared by the host. (value after reset=0)
RND: Report Noise Detects. Setting this bit will cause the FLEX decoder to report the results of
the noise detects it does under normal asynchronous operation (when first turned on and when
asynchronous). The results of the noise detect will be reported via NDR in the Roaming Status
Packet. This bit is set and cleared by the host. (value after reset=0)
ABI: All Block Information words. When this bit is set, the FLEX decoder will send all received
Block Information words 2-4 to the host. Note: Setting the SBI bit in the Control Packet only
enables errored and real time clock related block info words. (value after reset=0)
SAS: Start A-word Search. Setting this bit while in asynchronous battery save mode will cause the
FLEX decoder to warm-up the receiver and run an A-word search. If, during the A-word search,
the FLEX decoder finds sufficient FLEX signal, it will enter synchronous mode and start decoding
the frame. If the A-word search times-out without finding sufficient FLEX signal, it will battery
save and continue doing periodic noise detects. The time-out for the A-word searches is controlled
by the AST bits in the Timing Control Packet and the MOT bit in the Configuration Packet. The
A-word search takes priority over noise detects. Therefore, if the FLEX decoder is performing an
A-word search and the time comes to do automatic noise detect, the noise detect will not be
performed. This bit is set by the host, and cleared by the FLEX decoder once it has been acted on.
(value after reset=0)
DAS: Disable A-word Search. When this bit is set, an A-word search will not automatically occur
after a noise detect in asynchronous mode finds FLEX signal. This includes automatic noise
detects and noise detects initiated by the host by setting SND. The FLEX decoder will shut down
the receiver after the noise detect completes regardless of the result. When this bit is cleared, A-
word searches will occur after a noise detect finds signal in asynchronous mode. (value after
reset=0)
MFC: Missed Frame Control. These bits control the frames for which missing frame data (MS1,
MFI, MS2, MBI, and MAW) is reported in the Roaming Status Packet. (value after reset=0)
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