R5F21133DFP RENESAS [Renesas Technology Corp], R5F21133DFP Datasheet - Page 126

• Manufacturer Part Number: R5F21133DFP
• Description: 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY/R8C/Tiny SERIES
• Manufacturer: RENESAS [Renesas Technology Corp]

R8C/13 Group
Rev.1.20
REJ09B0111-0120
Table 13. 2 Registers to Be Used and Settings in Clock Synchronous Serial I/O Mode
Table 13.3 Pin Functions
TxD
(P1
Register
U0TB
U0RB
U0BRG
U0MR
U0C0
U0C1
UCON
NOTES:
RxD
(P1
CLK
(P1
1. Not all register bits are described above. Set those bits to “0” when writing to the registers in clock
Pin name
Table 13.3 lists the functions of the I/O pins during clock synchronous serial I/O mode. Note that for a
period from when the UART0 operation mode is selected to when transfer starts, the TxD0 pin outputs an
“H”. (If the NCH bit is set to “1”(N-channel open-drain output), this pin is in high-impedance state.)
synchronous serial I/O mode.
4
6
5
0
)
0
0
)
)
Jan 27, 2006
0 to 7
0 to 7
OER
0 to 7
SMD2 to SMD0
CKDIR
CLK1 to CLK0
TXEPT
NCH
CKPOL
UFORM
TE
TI
RE
RI
U0IRS
U0RRM
TXDISEL
TXDIEN
Serial data input
Transfer clock output
Transfer clock input
Serial data output
Bit
page 115 of 205
Function
Set transmission data
Reception data can be read
Overrun error flag
Set a bit rate
Set to “001
Select the internal clock or external clock
Select the count source for the U0BRG register
Transmit register empty flag
Select TxD0 pin output mode
Select the transfer clock polarity
Select the LSB first or MSB first
Set this bit to “1” to enable transmission/reception
Select the source of UART0 transmit interrupt
Set this bit to “1” to use continuous receive mode
Set to “0”
Set to “0”
Transmit buffer empty flag
Set this bit to “1” to enable reception
Reception complete flag
(Outputs dummy data when performing reception only)
PD1 register PD1_5 bit=0
(P1
U0MR register CKDIR bit=0
U0MR register CKDIR bit=1
PD1 register PD1_6 bit=0
5
2
can be used as an input port when performing transmission only)
”
Function
Method of selection
13.1 Clock Synchronous Serial I/O Mode