
484
Chapter 14
Queued CSI (CSI30, CSI31)
User’s Manual U16702EE3V2UD00
When the transmission/reception counter reaches the value set by SFN[3:0], then CSOT is cleared “0”
and the transmission/reception end interrupt signal INTC3nI is generated.
After the interrupt occurred, the received data can be read from SIRB. The Read FIFO pointer is auto-
matically incremented by the SIRB read operation.
All FIFO pointers must be cleared by setting FPCLR = 1 before the next transmit/receive cycle can start.
SFP[3:0] represents the [SIO Load/Store FIFO pointer] and shows the number of transmission/recep-
tions completed. In case of SFP[3:0]=0H, the numbers of transmissions/receptions depends on the set-
ting of the SFEMP bit:
SFEMP=0: 0 transmissions/receptions completed
SFEMP=1: 16 transmissions/receptions completed
Figure 14-20:
FIFO Buffer Transfer Mode (Master, Transmit/Receive) Timing
CTXE or CRXE
FIFO-empty
FIFO-counter
SCK3n
SO3n
SI3n
CS3n[3:0]
SIO
SFN3-0 Write
SFP3-0 Read
CSOT
INTC3nI
Transmission
start with
FIFO ready
Transmission
start with
FIFO ready
Initialization with
CTXE or CRXE = 0
0 1
0 1 2
1
0
0 1
0
data 0(T)
data 1(T)
data 2(T)
data 3(T)
data 4(T)
CS 0
CS 1
CS 2
CS 3
CS 4
3H
data 0(R)
data 1(R)
data 2(R)
data 3(R)
data 4(R)
0H
1H
2H
3H
4H
0H
1H
2H
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