Fujitsu FR81S User Manual
CHAPTER 40: MULTI-FUNCTION SERIAL INTERFACE
4. Registers
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : MULTI-FUNCTION SERIAL INTERFACE
FUJITSU SEMICONDUCTOR CONFIDENTIAL
64
4.3.8.
Serial Chip Select Control Status Register: SCSCR
The serial chip select control status register (SCSCR) is used to select a start pin and an end pin for serial
chip select, indicate an output pin for serial chip select, retain an active level of serial chip select, invert
serial chip select, and enable/disable output of serial chip select pins.
SCSCRn(n=0 to 11) : Address Base addr + 0E
H
(Access: Byte, Half-word,
Word)
15
14
13
12
11
10
9
8
bit
SST1
SST0
SED1
SED0
SCD1
SCD0
SCAM CDIV2
0
0
0
0
0
0
0
0
Initial value
R/W
R/W
R/W
R/W
R
R
R/W
R/W
Attribute
7
6
5
4
3
2
1
0
bit
CDIV1 CDIV0 CSLVL CSEN3 CSEN2 CSEN1 CSEN0 CSOE
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, bit14] SST1-0: Serial chip select start bits
These bits are used to select a pin where serial chip select starts.
If transmission disabled (SCR:TXE="0") status is changed to transmission enabled (SCR:TXE="1") status,
the serial chip select pin set by these bits will first become active.
SST1
SST0
Start pin
0
0
SCS0
0
1
SCS1
1
0
SCS2
1
1
SCS3
Notes:
⋅
These bits can be changed only when transmission and reception are disabled (SCR:TXE=RXE="0").
⋅
If the same value is set to both the serial chip select start bits (SST1, SST0) and the serial chip select end
bits (SED1, SED0), only the serial chip select pin set by these bits will become active.
⋅
In the slave mode (SCR:MS="1"), setting these bits has no effect.
⋅
Only the serial chip select pin with serial chip select enabled (CSEN="1") will become active.
[bit13, bit12] SED1-0: Serial chip select end bits
These bits are used to select a pin where serial chip select ends.
When the serial chip select pin set by these bits becomes active, the serial chip select pin specified by the
serial chip select start bits (SST1, SST0) will become active next time.
SED1
SED0
End pin
0
0
SCS0
0
1
SCS1
1
0
SCS2
1
1
SCS3
MB91520 Series
MN705-00010-1v0-E
1377