R5F21257SNFP#U0 Renesas Electronics America, R5F21257SNFP#U0 Datasheet - Page 319

• Manufacturer Part Number: R5F21257SNFP#U0
• Description: IC R8C/25 MCU FLASH 52LQFP
• Manufacturer: Renesas Electronics America
• Series: R8C/2x/25r

Specifications of R5F21257SNFP#U0

• Core Processor: R8C
• Core Size: 16/32-Bit
• Speed: 20MHz
• Connectivity: I²C, LIN, SIO, SSU, UART/USART
• Peripherals: POR, Voltage Detect, WDT
• Number Of I /o: 41
• Program Memory Size: 48KB (48K x 8)
• Program Memory Type: FLASH
• Ram Size: 2.5K x 8
• Voltage - Supply (vcc/vdd): 2.2 V ~ 5.5 V
• Data Converters: A/D 12x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 52-LQFP
• For Use With: R0K521256S000BE - KIT EVAL STARTER FOR R8C/25
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/24 Group, R8C/25 Group
Rev.3.00
REJ09B0244-0300
Table 15.5
i = 0 or 1
NOTES:
Table 15.6
UiTB
UiRB
UiBRG
UiMR
UiC0
UiC1
TXD0 (P1_4)
RXD0 (P1_5) Input serial data
CLK0 (P1_6)
TXD1 (P6_6)
RXD1 (P6_7) Input serial data
CLK1 (P6_5)
Table 15.6 lists the I/O Pin Functions in UART Mode. After the UARTi (i = 0 or 1) operating mode is selected, the
TXDi pin outputs “H” level. (If the NCH bit is set to 1 (N-channel open-drain output), this pin is in a high-
impedance state) until transfer starts.)
Pin name
1. The bits used for transmit/receive data are as follows: Bits 0 to 6 when transfer data is 7 bits long;
2. The following bits are undefined: Bits 7 and 8 when transfer data is 7 bits long; bit 8 when transfer
Register
bits 0 to 7 when transfer data is 8 bits long; bits 0 to 8 when transfer data is 9 bits long.
data is 8 bits long.
Feb 29, 2008
Registers Used and Settings for UART Mode
I/O Pin Functions in UART Mode
Output serial data
Programmable I/O Port
Input transfer clock
Output serial data
Programmable I/O Port
Input transfer clock
0 to 8
0 to 8
OER,FER,PER,SUM
0 to 7
SMD2 to SMD0
CKDIR
STPS
PRY, PRYE
CLK0, CLK1
TXEPT
NCH
CKPOL
UFORM
TE
TI
RE
RI
UiIRS
UiRRM
Function
Page 300 of 485
Bit
Set transmit data
Receive data can be read
Error flag
Set a bit rate
Set to 100b when transfer data is 7 bits long
Set to 101b when transfer data is 8 bits long
Set to 110b when transfer data is 9 bits long
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 to 0 when transfer data is 7 or 9 bits long.
Set to 1 to enable transmit
Transmit buffer empty flag
Set to 1 to enable receive
Receive complete flag
Select the source of UARTi transmit interrupt
Set to 0
(Cannot be used as a port when performing reception only)
PD1_5 bit in PD1 register = 0
(P1_5 can be used as an input port when performing transmission only)
CKDIR bit in U0MR register = 1
PD1_6 bit in PD1 register = 0
U1PINSEL bit in PMR register = 1
(Cannot be used as a port when performing reception only)
PD6_7 bit in PD6 register = 0
(P6_7 can be used as an input port when performing transmission only)
U1PINSEL bit in PMR register = 1
PD6_5 bit in PD6 register = 0
CKDIR bit in U1MR register = 1
CKDIR bit in U0MR register = 0
U1PINSEL bit in PMR register = 1
CKDIR bit in U1MR register = 0
(1)
Selection Method
(1, 2)
Function
15. Serial Interface