Renesas Asynchronous SH7145F User Manual
Page 10
SH7145F
Asynchronous Serial Data Transmission/Reception
REJ06B0357-0100O/Rev.1.00
March 2004
Page 10 of 17
Register
Bit
Set Value
Function
SMR_1
MP
0
Multiprocessor mode (enabled in asynchronous mode only)
Multiprocessor communication disabled when 0
CKS1
CKS2
0
0
Clock select 1, 0
When value is 00, P
φ
clock selected using on-chip baud rate generator
as clock source
BRR_1
H'40
Bit rate register 1
8-bit register for adjusting bit rate
SDCR_1
H'F2
Serial direction control register 1
DIR bit (bit 3) selects LSB-first or MSB-first
In task example, DIR = 0 (LSB-first)
SSR_1
H'xx
Serial status register 1
Comprises SCI1 status flag and transmit and receive multiprocessor bits
Only 0 may be written to the status flag, to clear it
TDRE
*
Transmit data register empty (status flag)
RDRF
*
Receive data register full (status flag)
ORER
*
Overrun error (status flag)
FER
*
Framing error (status flag)
PER
*
Parity error (status flag)
TEND
*
Transmit end (status flag)
MPB
0
Multiprocessor bit
MPBT
0
Multiprocessor bit transfer
PA4MD1
PA4MD0
0
1
Port A control register L2
Function setting for port A multiplex pin (TXD1)
PACRL2
PA3MD1
PA3MD0
0
1
Port A control register L2
Function setting for port A multiplex pin (RXD1)
*
: Can only be cleared to 0. Setting to 1 is performed by hardware.