upd70f3422gj-gae-qs-ax Renesas Electronics Corporation., upd70f3422gj-gae-qs-ax Datasheet - Page 559
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upd70f3422gj-gae-qs-ax
Manufacturer Part Number
upd70f3422gj-gae-qs-ax
Description
32-bit Single-chip Microcontroller
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.UPD70F3422GJ-GAE-QS-AX.pdf
(930 pages)
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Clocked Serial Interface (CSIB)
Discontinued
transmission
INTCBnT
CBnTSF
Table 17-8
CBnTX
SCKBn
SOBn
Note
(1)
(8) Check that the CBnSTR.CBnTSF bit = 0 and set the CBnPWR bit to 0 to
To continue transfer, repeat steps (5) to (7) before (8).
In order to start the entire data transfer the CBnTX register has to be written
initially, as done in step (5) above. If this step is omitted also no data will be
received.
In case the CSIB is operating in continuous slave transmission mode
(CBnCTL0.CBnTMS = 1, CBnCTL1.CBnCKS[2:0] = 111
written to the CBnTX register the SOBn pin outputs the level of the last bit.
Table 17-8 outlines this behaviour.
Discontinued slave transmission
The example shows the situation that two data bytes (55
transmitted correctly, but the third (96
(1) Data 55
(2) The master issues the clock SCKBn and transmission of 55
(3) INTCBnT is generated and the next data AA
(4) Transmission of the second data AA
(5) Since there is no new data available in CBnTX, but the master continuous
(6) New data (96
(7) With the next SCKBn cycle transmission of the new data (96
As a consequence the master receives a corrupted data byte from (5)
onwards, which is made up of a random number of the repeated last bit of the
former data and some first bits of the new data.
Preliminary User’s Manual U17566EE1V2UM00
(2)
55H
0
stop the operation of CSIBn (end of transmission/reception).
promptly, i.e. before the first data has been transmitted completely.
generated. But this time the next data is not written to CBnTX in time.
to apply SCKBn clocks, SOBn remains at the level of the transmitted last
bit.
Read the CBnRX register.
1
0
1
(3)
H
0
is written (by the CPU or DMA) to CBnTX.
1
0
H
) is written to CBnTX.
1
(4)
1
0
1
AAH
0
1
0
1
H
0
) fails.
(5)
H
continues correctly and INTCBnT is
(6)
H
is written to CBnTX
(7)
1
0
B
H
0
) and new data is not
96H
, AA
1
0
H
) are
1
H
H
starts.
) starts.
1
Chapter 17
0
559
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