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R8C/14 Group, R8C/15 Group 14. Serial Interface
Rev.2.10 Jan 19, 2006 Page 128 of 253
REJ09B0164-0210
Figure 14.4 U0MR and U0C0 Registers
UART0 Transmit / Receive Mode Register
Symbol Address After Reset
U0MR 00A0h 00h
Bit Symbol Bit Name Function RW
NOTES :
1.
Internal / External Clock Select
Bit
0 : Internal clock
1 : External clock
(1)
Stop Bit Length Select Bit
(b7)
Reserved Bit
RW
Odd / Even Parity Select Bit Enables when PRYE = 1
0 : Odd parity
1 : Even parity
PRYE
Parity Enable Bit 0 : Parity disabled
1 : Parity enabled
RW
Set to 0”
Set the PD1_6 bit in the PD1 register to “0” (input).
SMD2 RW
RW
STPS RW
0 : 1 Stop Bit
1 : 2 Stop Bits
CKDIR
PRY RW
RW
Serial Interface Mode Select Bit
b2 b1 b0
0 0 0 : Serial interface disabled
0 0 1 : Clock synchronous serial I/O mode
1 0 0 : UART mode transfer data 7 bits long
1 0 1 : UART mode transfer data 8 bits long
1 1 0 : UART mode transfer data 9 bits long
Other than above : Do not set
SMD1
b7 b6 b5 b4
0
b3 b2 b1 b0
SMD0 RW
UART0 Transmit / Receive Control Register 0
Symbol Address After Reset
U0C0
00A4h 08h
Bit Symbol Bit Name Function RW
NOTES :
1.
RW
Nothing is assigned. When write, set to “0”.
When read, its content is0”.
Data Output Select Bit 0 : TXD0 pin is a pin of CMOS output
1 : TXD0 pin is a pin of N-channel open drain output
UFORM
Transfer Format Select Bit 0 : LSB first
1 : MSB first
RW
Reserved Bit
CLK Polarity Select Bit 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
Set to “0”
Transmit Register Empty
Flag
0 : Data in transmit register (during transmit)
1 : No data in transmit register (transmit completed)
CLK1 RW
BRG Count Source Select
Bit
(1)
b1 b0
0 0 : Selects f1
0 1 : Selects f8
1 0 : Selects f32
1 1 : Do not set
NCH
RW
RW
CKPOL
(b2)
RW
RO
(b4)
b7 b6 b5 b4
If the BRG count source is sw itched, set the U0BRG register again.
b3 b2
TXEPT
b1 b0
0
CLK0
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