MC9S12G FREESCALE [Freescale Semiconductor, Inc], MC9S12G Datasheet - Page 277
MC9S12G
Manufacturer Part Number
MC9S12G
Description
Ignores external trigger. Performs one conversion sequence and stops.
Manufacturer
FREESCALE [Freescale Semiconductor, Inc]
Datasheet
1.MC9S12G.pdf
(1160 pages)
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Background Debug Module (S12SBDMV1)
handshake protocol is enabled, the time out between a read command and the data retrieval is disabled.
Therefore, the host could wait for more then 512 serial clock cycles and still be able to retrieve the data
from an issued read command. However, once the handshake pulse (ACK pulse) is issued, the time-out
feature is re-activated, meaning that the target will time out after 512 clock cycles. Therefore, the host
needs to retrieve the data within a 512 serial clock cycles time frame after the ACK pulse had been issued.
After that period, the read command is discarded and the data is no longer available for retrieval. Any
negative edge in the BKGD pin after the time-out period is considered to be a new command or a SYNC
request.
Note that whenever a partially issued command, or partially retrieved data, has occurred the time out in the
serial communication is active. This means that if a time frame higher than 512 serial clock cycles is
observed between two consecutive negative edges and the command being issued or data being retrieved
is not complete, a soft-reset will occur causing the partially received command or data retrieved to be
disregarded. The next negative edge in the BKGD pin, after a soft-reset has occurred, is considered by the
target as the start of a new BDM command, or the start of a SYNC request pulse.
MC9S12G Family Reference Manual, Rev.1.01
Freescale Semiconductor
277
This document is valid for the S12G96 and the S12G128 device. All information related to other devices is preliminary.
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