Fujitsu FR81S User Manual
CHAPTER 40: MULTI-FUNCTION SERIAL INTERFACE
4. Registers
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : MULTI-FUNCTION SERIAL INTERFACE
FUJITSU SEMICONDUCTOR CONFIDENTIAL
48
4.3.1.
Serial Control Register: SCR
The serial control register (SCR) allows you to disable/enable transmission/reception interrupts,
disable/enable transmission idle interrupt, disable/enable transmission and reception. Setup for connecting
SPI and CSIO reset are also allowed.
SCRn(n=0 to 11) : Address Base addr + 00
H
(Access: Byte, Half-word, Word)
7
6
5
4
3
2
1
0
bit
UPCL
MS
SPI
RIE
TIE
TBIE
RXE
TXE
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 UPCL:
Programmable clear bit
This bit initializes the internal state of CSIO.
When this bit is set to "1":
⋅
Directly reset CSIO (software reset). In this case, the register settings
will be retained. Note that any active transmission or reception will be
cut off immediately.
⋅
Baud rate generator restarts by reloading the setting value of the BGR
register.
⋅
All the transmissions/receptions and status interrupt factors (SSR:TDRE,
TBI, RDRF, ORE, TINT, CSE) will be initialized.
When this bit is set to "0": No effect on the operation.
A read always results in "0".
Notes:
⋅
Execute a programmable clear after disabling interrupts.
⋅
When using FIFO, disable FIFO (FCR0:FE2, FE1=0) before you execute
a programmable clear.
bit6 MS:
Master/slave function select
bit
This bit selects master or slave mode.
When this bit is set to "0": Master mode
When this bit is set to "1": Slave mode
Notes:
⋅
If SMR:SCKE=0 when the slave mode is selected, an external clock will
be input directly.
⋅
Set this bit when transmission and reception are disabled
(TXE=RXE=0).
⋅
After MS bit is set, set reception enable (RXE=1).
MB91520 Series
MN705-00010-1v0-E
1361