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Section 10 Serial Communication Interface
10.2.5
Interrupt Source
SCI1 has one interrupt source: transfer completion.
When SCI1 completes transfer, IRRS1 is set to 1 in IRR1. The SCI1 interrupt source can be
enabled or disabled by the IENS1 bit in IENR1.
For details, see section 3.3, Interrupts.
10.2.6
Application Notes
(1) When SCK
is designated as an input pin and an external clock is selected as the clock source,
1
the external clock must not be input before transfer operation is started by setting STF to 1 in
SCSR1.
(2) In subactive or subsleep mode, SCI1 can be used only when the CPU operation clock is φ
(3) Do not read or write to SCSRI during serial transfer. Use one of the following methods to
confirm that serial transfer has ended.
(a) Use SCI1 interrupt exception handling.
Set IENSI to 1 in IENR1, and execute interrupt exception handling.
(b) Perform IRR1 polling.
Confirm that IRRS1 has been set to 1 in IRRI while SCI interrupts are disabled (IENS1 = 0
in IEHR1).
Rev. 6.00 Aug 04, 2006 page 346 of 680
REJ09B0145-0600
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