Fujitsu FR81S User Manual
CHAPTER 40: MULTI-FUNCTION SERIAL INTERFACE
4. Registers
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : MULTI-FUNCTION SERIAL INTERFACE
FUJITSU SEMICONDUCTOR CONFIDENTIAL
52
4.3.3.
Extended Serial Control Register: ESCR
The extended communication control register (ESCR) is used to set the transmission/reception data length
as well as to fix the serial output at the "H" level.
- ESCRn(n=0 to 11) : Address Base + 03
H
(Access: Byte, Half-word, Word)
7
6
5
4
3
2
1
0
bit
SOP
L[3]
CSFE
WT[1:0]
L[2:0]
0
0
0
0
0
0
0
0
Initial value
R0,W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Attribute
Bit name
Function
bit7 SOP:
Serial output pin set bit
⋅
This bit is used to set the serial output pin at the "H" level. When you
write "1" to this bit, the SOT pin will be set to "H". However, you do not
have to write "0" to this bit.
⋅
A read always results in "0".
Note:
Do not set this bit during serial data transmission.
bit5 CSFE:
Serial chip select format
enable bit
Enable or disable format setting for each serial chip select pin.
⋅
When set to "0": Same data format and clock format will be set to all
serial chip select pins
⋅
When set to "1": Data format and clock format will be set to serial chip
select pins separately
When this bit is set to "1", following setups will be set to serial chip select
pins separately.
⋅
Inactive level for serial chip select
⋅
Mark level of serial clock
⋅
SPI transfer/normal transfer selection
⋅
Direction of serial data transfer
⋅
Serial data length
Notes:
⋅
This bit setting will be invalid when any of following is met.
⋅
When chip select pin is disabled (SCSCR:CSEN3-0=“0000”b)
⋅
When mode is in slave (SCR:MS=1)
bit4,
bit3
WT1, WT0:
Data transmission/reception
wait select bits
In the master mode, these bits set the number of wait for a successive data
transmission or reception. Operation in the slave mode is "00".
⋅
"00": SCK will be output sequentially.
⋅
"01": SCK will be output after waiting for 1-bit time.
⋅
"10": SCK will be output after waiting for 2-bit time.
⋅
"11": SCK will be output after waiting for 3-bit time.
MB91520 Series
MN705-00010-1v0-E
1365