Rev. 1.00, 09/03, page 471 of 704
TE bit
SCK
output pin
TxD
output pin
Port
input/output
Port input/output
Port
input/output
Start
Stop
High output
High output
Transmission start
Transmission end
Transition to
software standby
mode
Software standby
mode cancelled
SCI TxD output
Port
Port
SCI
TxD output
Figure 16.22 Pin States during Transmission in Asynchronous Mode (Internal Clock)
TE bit
SCK
output pin
TxD
output pin
Port input/output
Port
input/output
Port
input/output
High output
*
Marking output
Transmission start
Transmission end
Transition to
software standby
mode
Software standby
mode cancelled
SCI TxD output
Port
Port
SCI
TxD output
Last TxD bit retained
Note:
*
Initialized in software standby mode
Figure 16.23 Pin States during Transmission in Clocked Synchronous Mode
(Internal Clock)
Reception: Before making the transition to module stop, software standby, watch, subactive, or
subsleep mode, stop reception (RE = 0). RSR, RDR, and SSR are reset. If transition is made
during data reception, the data being received will be invalid.
To receive data in the same reception mode after mode cancellation, set RE to 1, and then start
reception. To receive data in a different reception mode, initialize the SCI first.
Figure 16.24 shows a sample flowchart for mode transition during reception.
Summary of Contents for H8S/2437
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