CHAPTER 13 SERIAL INTERFACE CSI10
Preliminary User’s Manual U16846EJ1V0UD
266
(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 input clears this register to 00H.
Figure 13-3. 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
CKS102
CKS101
CKS100
CSI10 serial clock selection
Note
Mode
0 0 0
f
X
/2 (5 MHz)
Master mode
0 0 1
f
X
/2
2
(2.5 MHz)
Master mode
0 1 0
f
X
/2
3
(1.25 MHz)
Master mode
0 1 1
f
X
/2
4
(625 kHz)
Master mode
1 0 0
f
X
/2
5
(312.5 kHz)
Master mode
1 0 1
f
X
/2
6
(156.25 kHz)
Master mode
1 1 0
f
X
/2
7
(78.13 kHz)
Master mode
1
1
1
External clock input to SCK10
Slave mode
Note Be sure to set the serial clock so that the following condition is satisfied.
•
V
DD
= 2.7 to 5.5 V: Serial clock
≤
5 MHz