RL78/F13, F14 CHAPTER 15 SERIAL ARRAY UNIT
R01UH0368EJ0210 Rev.2.10 889
Dec 10, 2015
(4) Processing flow (in continuous transmission/reception mode)
Figure 15-69. Timing Chart of Slave Transmission/Reception (in Continuous Transmission/Reception Mode)
(Type 1: DAPmn = 0, CKPmn = 0)
Notes 1. If transmit data is written to the SDRmn register while the BFFmn bit of serial status register mn (SSRmn)
is 1 (valid data is stored in serial data register mn (SDRmn)), the transmit data is overwritten.
2. The transmit data can be read by reading the SDRmn register during this period. At this time, the transfer
operation is not affected.
Caution The MDmn0 bit of serial mode register mn (SMRmn) can be rewritten even during operation.
However, rewrite it before transfer of the last bit is started, so that it has been rewritten before the
transfer end interrupt of the last transmit data.
Remarks 1. <1> to <8> in the figure correspond to <1> to <8> in Figure 15-70 Flowchart of Slave
Transmission/Reception (in Continuous Transmission/Reception Mode).
2. m: Unit number (m = 0, 1), n: Channel number (n = 0, 1), p: CSI number (p = 00, 01, 10, 11),
mn = 00, 01, 10, 11
SSmn
SEmn
SDRmn
SCKp pin
SIp pin
Shift
register mn
INTCSIp
TSFmn
SOp pin
BFFmn
MDmn0
STmn
<4> <5>
Transmit data 1
Transmit data 3
Receive data 3
Write
Read
Read
Read
Write
<1>
<2>
<3>
<2>
<3>
<4> <2>
<7><8>
(Note 1)
Transmit data
2
Write
<6>
<3>
(Note 2)
(Note 2)
Reception & shift operation
Receive data 2
Receive data 1
Receive data 1
Receive data 2
Receive data 3
Transmit data 3
Transmit data 2
Transmit data 1
Data transmission/reception (8-bit length)
Reception & shift operation
Reception & shift operation
Data transmission/reception (8-bit length)
Data transmission/reception (8-bit length)
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