Section 16 Serial Communication Interface (SCI, IrDA, and CRC)
Rev. 3.00 Jan 25, 2006 page 453 of 872
REJ09B0286-0300
16.7.7
Serial Data Reception (Except in Block Transfer Mode)
Data reception in smart card interface mode is identical to that in normal serial communication
interface mode. Figure 16.32 shows the data re-transfer operation during reception.
1. If a parity error is detected in receive data, the PER bit in SSR is set to 1. Here, an ERI
interrupt request is generated if the RIE bit in SCR is set to 1. Clear the PER bit to 0 before the
next parity bit is sampled.
2. For the frame in which a parity error is detected, the RDRF bit in SSR is not set to 1.
3. If no parity error is detected, the PER bit in SSR is not set to 1. In this case, data is determined
to have been received successfully, and the RDRF bit in SSR is set to 1. Here, an RXI interrupt
request is generated if the RIE bit in SCR is set.
Figure 16.33 shows a sample flowchart for reception. All the processing steps are automatically
performed using an RXI interrupt request to activate the DTC. In reception, setting the RIE bit to 1
allows an RXI interrupt request to be generated when the RDRF flag is set to 1. This activates
DTC by an RXI request thus allowing transfer of receive data if the RXI interrupt request is
specified as a source of DTC activation beforehand. The RDRF flag is automatically cleared to 0
at data transfer by DTC. If an error occurs during reception, i.e., either the ORER or PER flag is
set to 1, a transmit/receive error interrupt (ERI) request is generated and the error flag must be
cleared. If an error occurs, DTC is not activated and receive data is skipped, therefore, the number
of bytes of receive data specified in DTC are transferred. Even if a parity error occurs and PER is
set to 1 in reception, receive data is transferred to RDR, thus allowing the data to be read.
The above flow also applies to the case in which RFU is activated by RDRF in SCI_0 and SCI_2.
Note: For operations in block transfer mode, see section 16.4, Operation in Asynchronous Mode.
D0 D1 D2 D3 D4 D5 D6 D7 Dp DE
Ds D0 D1 D2 D3 D4 D5 D6 D7 Dp
(DE)
Ds D0 D1 D2 D3 D4
Ds
(n + 1) th
transfer frame
Re-transfer frame
nth transfer frame
RDRF
[1]
PER
[2]
[3]
[4]
Figure 16.32 Data Re-transfer Operation in SCI Reception Mode
Содержание H8S/2158
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Страница 36: ...Rev 3 00 Jan 25 2006 page xxxiv of lii B Product Lineup 863 C Package Dimensions 864 Index 865...
Страница 47: ...Rev 3 00 Jan 25 2006 page xlv of lii Appendix Figure C 1 Package Dimensions TBP 112A 864...
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Страница 70: ...Section 1 Overview Rev 3 00 Jan 25 2006 page 16 of 872 REJ09B0286 0300...
Страница 118: ...Section 3 MCU Operating Modes Rev 3 00 Jan 25 2006 page 64 of 872 REJ09B0286 0300...
Страница 126: ...Section 4 Exception Handling Rev 3 00 Jan 25 2006 page 72 of 872 REJ09B0286 0300...
Страница 198: ...Section 6 Bus Controller Rev 3 00 Jan 25 2006 page 144 of 872 REJ09B0286 0300...
Страница 326: ...Section 10 8 Bit PWM Timer PWM Rev 3 00 Jan 25 2006 page 272 of 872 REJ09B0286 0300...
Страница 440: ...Section 15 Watchdog Timer WDT Rev 3 00 Jan 25 2006 page 386 of 872 REJ09B0286 0300...
Страница 606: ...Section 17 I 2 C Bus Interface IIC Rev 3 00 Jan 25 2006 page 552 of 872 REJ09B0286 0300...
Страница 742: ...Section 19 Multimedia Card Interface MCIF Rev 3 00 Jan 25 2006 page 688 of 872 REJ09B0286 0300...
Страница 744: ...Section 20 Encryption Operation Circuit DES and GF Rev 3 00 Jan 25 2006 page 690 of 872 REJ09B0286 0300...
Страница 750: ...Section 21 D A Converter Rev 3 00 Jan 25 2006 page 696 of 872 REJ09B0286 0300...
Страница 768: ...Section 22 A D Converter Rev 3 00 Jan 25 2006 page 714 of 872 REJ09B0286 0300...
Страница 770: ...Section 23 RAM Rev 3 00 Jan 25 2006 page 716 of 872 REJ09B0286 0300...
Страница 824: ...Section 26 Clock Pulse Generator Rev 3 00 Jan 25 2006 page 770 of 872 REJ09B0286 0300...
Страница 844: ...Section 27 Power Down Modes Rev 3 00 Jan 25 2006 page 790 of 872 REJ09B0286 0300...
Страница 878: ...Section 28 List of Registers Rev 3 00 Jan 25 2006 page 824 of 872 REJ09B0286 0300...
Страница 926: ...Index Rev 3 00 Jan 25 2006 page 872 of 872 REJ09B0286 0300...