Fujitsu FR81S User Manual
CHAPTER 40: MULTI-FUNCTION SERIAL INTERFACE
4. Registers
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : MULTI-FUNCTION SERIAL INTERFACE
FUJITSU SEMICONDUCTOR CONFIDENTIAL
68
[bit7 to bit0] CSHD7-0: Serial chip select hold delay bits
These bits are used to set a time interval between the timing half bit after a sampling point of the last data
bit and the timing when a serial chip select pin becomes inactive. If "00h" is set to these bits, the timing half
bit after a sampling point of the last data bit will be the same as the timing when a serial chip select pin
becomes inactive.
CSHD7 CSHD6 CSHD5 CSHD4 CSHD3 CSHD2 CSHD1 CSHD0
Hold delay time
0
0
0
0
0
0
0
0
No hold delay time
0
0
0
0
0
0
0
1
1×
Serial chip select timing
operating clock
0
0
0
0
0
0
1
0
2×
Serial chip select timing
operating clock
1
1
1
1
1
1
1
0
254×
Serial chip select timing
operating clock
1
1
1
1
1
1
1
1
255×
Serial chip select timing
operating clock
Notes:
⋅
These bits can be changed only when transmission and reception are disabled (SCR:TXE=RXE="0").
⋅
In the slave mode (SCR:MS="1"), setting these bits has no effect.
⋅
If these bits are set to "00"h, the timing when a serial chip select pin becomes active will be the same as
the timing when the serial clock outputs an edge for the first time.
SCSTR3n-2n(n=0 to 11) : Address Base addr + 10
H
(Access: Byte, Half-word,
Word)
15
14
13
12
11
10
9
8
bit
CSDS15 CSDS14 CSDS13 CSDS12 CSDS11 CSDS10 CSDS9 CSDS8
0
0
0
0
0
0
0
0
Initial value
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Attribute
7
6
5
4
3
2
1
0
bit
CSDS7 CSDS6 CSDS5 CSDS4 CSDS3 CSDS2 CSDS1 CSDS0
0
0
0
0
0
0
0
0
Initial value
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Attribute
[bit15 to bit0] CSDS15-0: Serial chip deselect bits
These bits are used to set a minimum time interval between the timing when a serial chip select pin
becomes inactive and the timing when the serial chip select pin becomes active next time.
MB91520 Series
MN705-00010-1v0-E
1381