Section 12 Serial Communication Interface (SCI)
Rev. 3.00 Mar. 14, 2006 Page 393 of 804
REJ09B0104-0300
Bit Functions in Smart Card Interface Mode (When SMIF in SCMR = 1):
Bit Bit
Name
Initial
Value R/W Description
7 TDRE
1 R/(W)
*
Transmit Data Register Empty
Indicates whether TDR contains transmit data.
[Setting conditions]
•
When the TE bit in SCR is 0
•
When data is transferred from TDR to TSR
[Clearing conditions]
•
When 0 is written to TDRE after reading TDRE = 1
(When the CPU is used to clear this flag by writing 0
while the corresponding interrupt is enabled, be sure
to read the flag after writing 0 to it.)
•
When a TXI interrupt request is issued allowing
DMAC to write data to TDR
6 RDRF
0 R/(W)
*
Receive Data Register Full
Indicates whether receive data is stored in RDR.
[Setting condition]
•
When serial reception ends normally and receive data
is transferred from RSR to RDR
[Clearing conditions]
•
When 0 is written to RDRF after reading RDRF = 1
(When the CPU is used to clear this flag by writing 0
while the corresponding interrupt is enabled, be sure
to read the flag after writing 0 to it.)
•
When an RXI interrupt request is issued allowing
DMAC to read data from RDR
The RDRF flag is not affected and retains its previous
value even when the RE bit in SCR is cleared to 0.
Note that when the next reception is completed while the
RDRF flag is being set to 1, an overrun error occurs and
the received data is lost.
electronic components distributor
Содержание H8SX series
Страница 2: ...Rev 3 00 Mar 14 2006 Page ii of xxxviii Downloaded from Elcodis com electronic components distributor...
Страница 22: ...Rev 3 00 Mar 14 2006 Page xxii of xxxviii Downloaded from Elcodis com electronic components distributor...
Страница 32: ...Rev 3 00 Mar 14 2006 Page xxxii of xxxviii Downloaded from Elcodis com electronic components distributor...
Страница 38: ...Rev 3 00 Mar 14 2006 Page xxxviii of xxxviii Downloaded from Elcodis com electronic components distributor...
Страница 845: ...Downloaded from Elcodis com electronic components distributor...
Страница 846: ...H8SX 1520 Group Hardware Manual Downloaded from Elcodis com electronic components distributor...