Renesas H8S/2100 Series, Hardware Manual

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Section 15 Serial Communication Interface (SCI)
Rev. 1.00 Apr. 28, 2008 Page 411 of 994
REJ09B0452-0100
15.3.6 Serial Control Register (SCR)
SCR is a register that performs enabling or disabling of SCI transfer operations and interrupt
requests, and selection of the transfer clock source. For details on interrupt requests, see section
15.8, Interrupt Sources. Some bits in SCR have different functions in normal mode and smart card
interface mode. The CPU can always read SCR. The CPU can write to SCR only at the initial
settings; do not have the CPU write to SCR in transmission, reception, and simultaneous data
transmission and reception.
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Bit Functions in Normal Serial Communication Interface Mode (when SMIF in SCMR = 0)
Bit Bit Name Initial Value R/W Description
7 TIE 0 R/W Transmit Interrupt Enable
When this bit is set to 1, a TXI interrupt request is
enabled.
6 RIE 0 R/W Receive Interrupt Enable
When this bit is set to 1, RXI and ERI interrupt
requests are enabled.
5 TE 0 R/W Transmit Enable
When this bit is set to 1, transmission is enabled.
4 RE 0 R/W Receive Enable
When this bit is set to 1, reception is enabled.
3 MPIE 0 R/W Multiprocessor Interrupt Enable (enabled only when
the MP bit in SMR is 1 in asynchronous mode)
When this bit is set to 1, receive data in which the
multiprocessor bit is 0 is skipped, and setting of the
RDRF, FER, and ORER status flags in SSR is
disabled. On receiving data in which the
multiprocessor bit is 1, this bit is automatically
cleared and normal reception is resumed. For
details, see section 15.5, Multiprocessor
Communication Function.
2 TEIE 0 R/W Transmit End Interrupt Enable
When this bit is set to 1, a TEI interrupt request is
enabled.