Fujitsu FR81S User Manual
CHAPTER 40: MULTI-FUNCTION SERIAL INTERFACE
6. Operation of CSIO
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : MULTI-FUNCTION SERIAL INTERFACE
FUJITSU SEMICONDUCTOR CONFIDENTIAL
191
6.2.1.
Normal Transfer (I)
Features
Item
Description
1
Mark level of serial clock (SCK)
"H"
2
Transmission data output timing
SCK falling edge
3
Reception data sampling
SCK rising edge
4
Data length
5-16, 20, 24, 32 bits
Register Settings
The following table lists the register settings required for normal transfer (I).
SCR:SPI=0*
1
, SMR:MD2=0, MD1=1, MD0=0, SCINV=0*
1
Master operations: SCR:MS=0, SMR:SCKE=1
Slave operations: SCR:MS=1, SMR:SCKE=0
*1) Bit settings depend on the condition. See Table 6-2 for details.
Note:
Use proper usage for setting the registers other than the bits above.
Normal Transfer (I) Timing Chart (Serial Chip Select Pin Unused)
Figure 6-8 Normal Transfer (I) Timing Chart (Serial Chip Select Pin Unused)
*A
D7
● Transmission
operation
operation
SCK
SOUT
TDR RW
TXE
D0
D7
D1 D2 D3 D4 D5 D6
● Reception
operation
operation
SIN
RXE
Sampling
1
st
byte
RDRF
TDRE
D0 D1 D2 D3 D4 D5 D6
2
nd
byte
D0 D1 D2 D3 D4 D5 D6 D7 D0 D1 D2 D3 D4 D5 D6 D7
RDR RD
*A:
”H” when SCR:MS=0
Value of D7 when SCR:MS=1
MB91520 Series
MN705-00010-1v0-E
1504