Renesas M16C Series User Manual page 101

M30240 Group
UARTi transmit/receive control register 0
b7 b6 b5
UART2 transmit/receive control register 0
b7 b6 b5
Figure 1.78: Serial I/O-related registers (3)
Rev.1.00 Sep 24, 2003 Page 83 of 360
b4 b3 b2 b1 b0
Symbol
UiC0(i=0,1)
Bit
Bit name
symbol
CLK0 BRG count source
select bit
CLK1
CRS CTS/RTS function
select bit
TXEPT Transmit register empty
flag
CRD CTS/RTS disable bit
Nothing is assigned.
This bit can neither be set nor reset. When read, the value of this bit is "0".
CKPOL CLK polarity select bit
UFORM Transfer format select bit
Note 1: Set the corresponding port direction register to "0".
Note 2: The settings of the corresponding port register and port direction register are invalid.
b4 b3 b2 b1 b0
Symbol
U2C0
Bit
Bit name
symbol
CLK0 BRG count source
select bit
CLK1
CRS CTS/RTS function
select bit
TXEPT Transmit register empty
flag
CRD CTS/RTS disable bit
Nothing is assigned.
This bit can neither be set nor reset. When read, the value of this bit is "0".
CKPOL CLK polarity select bit
UFORM Transfer format select bit
(Note 3)
Note 1: Set the corresponding port direction register to "0".
Note 2: The settings of the corresponding port register and port direction register are invalid.
Note 3: Only clock synchronous serial I/O mode and 8-bit UART mode are valid.
Address When reset
03A4 , 03AC 08
16 16 16
Function
(During clock synchronous
serial I/O mode)
b1 b0 b1 b0
0 0 : f is selected 0 0 : f
1
0 1 : f is selected 0 1 : f
8
1 0 : f is selected 1 0 : f
32
1 1 : Reserved 1 1 : Reserved
Valid when bit 4 = "0" Valid when bit 4 = "0"
0 : CTS function is selected (Note 1) 0 : CTS function is selected (Note 1)
1 : RTS function is selected (Note 2)
1 : RTS function is selected (Note 2)
0 : Data present in transmit
0 : Data present in transmit register
register (during transmission)
1 : No data present in transmit
1 : No data present in transmit
register (transmission
completed)
0 : CTS/RTS function enabled 0 : CTS/RTS function enabled
1 : CTS/RTS function disabled
1 : CTS/RTS function disabled
(P6 and P6 function as
0 4
programmable I/O port)
0 : Transmit data is output at
Must always be "0"
falling edge of transfer clock
and receive data is input at
rising edge
1 : Transmit data is output at
rising edge of transfer clock
and receive data is input at
falling edge
0 : LSB first
Must always be "0"
1 : MSB first
Address When reset
037C 08
16 16
Function
(During clock synchronous
serial I/O mode)
b1 b0
0 0 : f is selected
1
0 1 : f is selected
8
1 0 : f is selected
32
1 1 : Reserved
Valid when bit 4 = "0"
0 : CTS function is selected (Note 1)
1 : RTS function is selected (Note 2)
0 : Data present in transmit
register (during transmission)
1 : No data present in transmit
register (transmission
completed)
0 : CTS/RTS function enabled
1 : CTS/RTS function disabled
(P7 functions
3
programmable I/O port)
0 : Transmit data is output at
falling edge of transfer clock
and receive data is input at
rising edge
1 : Transmit data is output at
rising edge of transfer clock
and receive data is input at
falling edge
0 : LSB first
1 : MSB first
UART0 to UART2
Function
R W
(During UART mode)
is selected
1
is selected
8
is selected
32
(during transmission)
register (transmission completed)
(P6 and P6 function as
0 4
programmable I/O port)
Function
R W
(During UART mode)
b1 b0
0 0 : f is selected
1
0 1 : f is selected
8
1 0 : f is selected
32
1 1 : Reserved
Valid when bit 4 = "0"
0 : CTS function is selected (Note 1)
1 : RTS function is selected (Note 2)
0 : Data present in transmit register
(during transmission)
1 : No data present in transmit
register (transmission completed)
0 : CTS/RTS function enabled
1 : CTS/RTS function disabled
(P7 functions programmable
3
I/O port)
Must always be "0"
0 : LSB first
1 : MSB first