CHAPTER 11 SERIAL INTERFACE CSI10
Preliminary User’s Manual U19014EJ1V0UD
258
(2) Serial clock selection register 10 (CSIC10)
This register specifies the timing of the data transmission/reception and sets the serial clock.
CSIC10 can be set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation sets this register to 00H.
Figure 11-3. Format of Serial Clock Selection Register 10 (CSIC10)
Address: FF81H After reset: 00H R/W
Symbol
7 6 5 4 3 2 1 0
CSIC10 0
0
0 CKP10
DAP10
CKS102
CKS101
CKS100
CKP10
DAP10
Specification of data transmission/reception timing
Type
0
0
D7
D6
D5
D4
D3
D2
D1
D0
SCK10
SO10
SI10 input timing
1
0
1
D7
D6
D5
D4
D3
D2
D1
D0
SCK10
SO10
SI10 input timing
2
1
0
D7
D6
D5
D4
D3
D2
D1
D0
SCK10
SO10
SI10 input timing
3
1
1
D7
D6
D5
D4
D3
D2
D1
D0
SCK10
SO10
SI10 input timing
4
CSI10 serial clock selection
CKS102 CKS101 CKS100
f
PRS
=
12 MHz
f
PRS
=
16 MHz
Mode
0 0 0
f
PRS
/2
6 MHz
8 MHz
0 0 1
f
PRS
/2
2
3 MHz
4 MHz
0 1 0
f
PRS
/2
3
1.5 MHz
2 MHz
0 1 1
f
PRS
/2
4
750 kHz
1 MHz
1 0 0
f
PRS
/2
5
375
kHz
500 kHz
1 0 1
f
PRS
/2
6
187.5
kHz
250
kHz
1 1 0
f
PRS
/2
7
93.75
kHz
125
kHz
Master mode
1
1
1
External clock input to SCK10
Slave mode
Cautions 1. Do not write to CSIC10 while CSIE10 = 1 (operation enabled).
2. To use P10/SCK10 and P12/SO10 as general-purpose ports, set CSIC10 in the default status
(00H).
3. The phase type of the data clock is type 1 after reset.
Remark
f
PRS
: Peripheral hardware clock frequency
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