CMS32L051 User Manual |Chapter 12 Universal Serial Communication Unit
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2) Operation steps
Figure 12-56 Initial setup step of slave reception
initial configuration starts
configure PER0 register
configure SPSm register
configure SMRmn register
configure SCRmn register
configure SDRmn register
configure port
write SSm register
initial configuration completes
release universal serial
communication unit from reset state,
start providing clock.
configure operational clock
configure operational mode..etc.
configure communication format
set baud rate (bit15~9) to "0000000B"
via Configure port register and port
mode register, data input and clock
input of target channel is set to valid.
SSmn bit of target channel set to "1"
(Semn=1: set to operation enable
state). Wait for master device clock.
Figure 12-57 Abort step of Slave receiving
termination configuration
starts
TSFmn = 0？
write into STm register
modify SOEm register
configuration
configure PER0 register
termination configuration
ends.
Yes
No
if there are ongoing data transmission,
then wait till transmission completed. (if
need urgent stop, then no need to wait).
set STmm bit of target channel to 1.
(SEmn=0: set to operation stop state).
set SOEmn bit to 0, stop output of target
channel
stop clock of universal serial communication
unit, set to reset state
finish termination configuration, enter into
next processing.
(selection)
(mandatory)
(mandatory)
(selection)
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