R5F21257SNFP#U0 Renesas Electronics America, R5F21257SNFP#U0 Datasheet - Page 314

• 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 15.2
i = 0 or 1
NOTE:
Table 15.3
UiTB
UiRB
UiBRG
UiMR
UiC0
UiC1
TXD0 (P1_4)
RXD0 (P1_5)
CLK0 (P1_6)
TXD1 (P6_6)
RXD1 (P6_7)
CLK1 (P6_5)
Table 15.3 lists the I/O Pin Functions in Clock Synchronous Serial I/O Mode. The TXDi pin outputs “H” level
between the operating mode selection of UARTi (i = 0 or 1) and transfer start. (If the NCH bit is set to 1 (N-channel
open-drain output), this pin is in a high-impedance state.)
Pin Name
1. Set bits which are not in this table to 0 when writing to the above registers in clock synchronous
Register
serial I/O mode.
Feb 29, 2008
Registers Used and Settings in Clock Synchronous Serial I/O Mode
I/O Pin Functions in Clock Synchronous Serial I/O Mode
Output serial data
Input serial data
Output transfer clock
Input transfer clock
Output serial data
Input serial data
Output transfer clock
Input transfer clock
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
UiIRS
UiRRM
Function
Page 295 of 485
Bit
Set data transmission
Data reception can be read
Overrun error flag
Set bit rate
Set to 001b
Select the internal clock or external clock
Select the count source in the UiBRG register
Transmit register empty flag
Select TXDi pin output mode
Select the transfer clock polarity
Select the LSB first or MSB first
Set this bit to 1 to enable transmission/reception
Transmit buffer empty flag
Set this bit to 1 to enable reception
Reception complete flag
Select the UARTi transmit interrupt source
Set this bit to 1 to use continuous receive mode
(Outputs dummy data 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 = 0
CKDIR bit in U0MR register = 1
PD1_6 bit in PD1 register = 0
U1PINSEL bit in PMR register = 1
(Outputs dummy data when performing reception only)
U1PINSEL bit in PMR register = 1
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
CKDIR bit in U1MR register = 0
U1PINSEL bit in PMR register = 1
PD6_5 bit in PD6 register = 0
CKDIR bit in U1MR register = 1
Selection Method
Function
(1)
15. Serial Interface