190
CHAPTER 14 SERIAL INTERFACE SIO2
Preliminary User’s Manual U14581EJ3V0UM00
Cautions
1.
Bits 5 and 6 must be set to 0.
2.
While a serial transfer operation is enabled (CSIE2 = 1), be sure to stop the serial transfer
operation once before changing the values of bits other than CSIE2 to different data.
3.
When operation is disabled (CSIE2 = 0) during a serial transfer operation, the operation
will be stopped immediately. At this time, even if operation is enabled again (CSIE2
= 1) after it was once stopped, the operation will not start. To resume operation, set
operation enable (CSIE2 = 1) and then execute an access that will be the start trigger
of each transfer operation mode.
4.
Changing CSIE2 and other bits at the same time is prohibited. After clearing CSIE2 to
0, change the other bits.
Remark
f
X
: Main system clock oscillation frequency
The following shows the relationships between the CLPO and CLPH settings, and the serial transfer clock, data
output, and input data capture timing.
Figure 14-3. Serial Transfer Operation Timing According to CLPO and CLPH Settings
CLPO
CLPH
Serial Transfer Operation Clock Selection
0
0
0
1
1
0
1
1
Remarks 1. SCK2: Serial transfer clock
2. SO2:
Data output timing
3. SI2:
Input data capture timing
D7
D6
D5
D4
D3
D2
D1
D0
SCK2
SO2
SI2
D7
D6
D5
D4
D3
D2
D1
D0
SCK2
SO2
SI2
D7
D6
D5
D4
D3
D2
D1
D0
SCK2
SO2
SI2
D7
D6
D5
D4
D3
D2
D1
D0
SCK2
SO2
SI2
Содержание mPD780851
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