R5F21133DFP RENESAS [Renesas Technology Corp], R5F21133DFP Datasheet - Page 131
R5F21133DFP
Manufacturer Part Number
R5F21133DFP
Description
16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY/R8C/Tiny SERIES
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.R5F21133DFP.pdf
(224 pages)
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Part Number:
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R8C/13 Group
Rev.1.20
REJ09B0111-0120
Table 13.5 Registers to Be Used and Settings in UART Mode
NOTES:
Table 13.6 I/O Pin Functions
1. The bits used for transmit/receive data are as follows: Bit 0 to bit 6 when transfer data is 7 bits long; bit 0
2. An external clock can be selected in UART0 only.
TxD
Register
UiTB
UiRB
UiBRG
UiMR
UiC0
UiC1
UCON
TxD
TxD
(P3
RxD
CLK
Table 13.6 lists the functions of the I/O pins during UART mode. Note that for a period from when the
UARTi operation mode is selected to when transfer starts, the TxDi pin outputs an “H”. (If the NCH bit is
set to “1”(N-channel open-drain output), this pin is in high-impedance state.)
Pin name
to bit 7 when transfer data is 8 bits long; bit 0 to bit 8 when transfer data is 9 bits long.
7
11
0
10
0
0
)
(P1
(P1
(P1
/RxD
(P0
Jan 27, 2006
4
5
6
0
)
)
)
)
1
0 to 8
0 to 8
OER,FER,PER,SUM Error flag
0 to 7
SMD2 to SMD0
CKDIR
STPS
PRY, PRYE
CLK0, CLK1
TXEPT
NCH
CKPOL
UFORM
TE
TI
RE
RI
U0IRS, U1IRS
U0RRM
TXD1SEL
TXD1EN
Serial data output
Serial data input
Programmable I/O port
Serial data output
Serial data input
Serial data output
Transfer clock input
Bit
page 120 of 205
Function
Set transmission data
Reception data can be read
Set a bit rate
Set these bits to ‘100
Set these bits to ‘101
Set these bits to ‘110
Select the internal clock or external clock
Select the stop bit
Select whether parity is included and whether odd or even
Select the count source for the UiBRG register
Transmit register empty flag
Select TxDi pin output mode
Set to “0”
LSB first or MSB first can be selected when transfer data is 8 bits long. Set this
bit to “0” when transfer data is 7 or 9 bits long.
Set this bit to “1” to enable transmission
Transmit buffer empty flag
Set this bit to “1” to enable reception
Reception complete flag
Select the source of UART0/UART1 transmit interrupt
Set to “0”
Select output pin for UART1 transfer data
Select TxD
(Cannot be used as a port when performing reception only)
PD1 register PD1_5 bit=0
(Can be used as an input port when performing transmission only)
U0MR register CKDIR bit=0
U0MR register CKDIR bit=1
PD1 register PD1_6 bit=0
TXD1EN=1
TXD1EN=0, PD3 register PD3_7 bit=0
Serial data output, TXD1SEL=1
10
or RxD
2
2
2
1
Function
(1)
’ when transfer data is 7 bits long
’ when transfer data is 8 bits long
’ when transfer data is 9 bits long
to be used
(1)
13.2 Clock Asynchronous Serial I/O (UART) Mode
Method of selection
(2)
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