R5F21257SNFP#U0 Renesas Electronics America, R5F21257SNFP#U0 Datasheet - Page 312

• 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
Figure 15.6
UARTi Transmit/Receive Control Register 1 (i = 0 or 1)
Port Mode Register
UART1 Function Select Register
b7 b6 b5 b4
NOTES:
b7 b6 b5 b4
b7
1.
2.
0 0
The RI bit is set to 0 w hen the higher byte of the UiRB register is read out.
Set the UiRRM bit to 0 (disables continuous receive mode) in UART mode.
Feb 29, 2008
b3 b2 b1
b3 b2
0
0
Registers U0C1 to U1C1, U1SR, and PMR
b1
0
b0
b0
b0
0
Set to 0Fh w hen using UART1.
As a result, UART1 can be used for clock synchronous or clock asynchronous serial I/O.
Do not set values other than 0Fh.
When read, its content is undefined.
Bit Symbol
Bit Symbol
U1PINSEL
(b7-b6)
(b3-b0)
(b6-b5)
Symbol
Symbol
UiRRM
Symbol
IICSEL
U0C1
U1C1
UiIRS
U1SR
PMR
RE
Page 293 of 485
TE
RI
—
—
—
TI
Transmit enable bit
Transmit buffer empty flag
Receive enable bit
Receive complete flag
UARTi transmit interrupt cause
select bit
UARTi continuous receive mode
enable bit
Nothing is assigned. If necessary, set to 0.
When read, the content is 0.
Reserved bits
Port CLK1/TXD1/RXD1 sw itch bit
Reserved bits
SSU / I
2
C bus sw itch bit
(2)
Address
Bit Name
Address
Bit Name
00A5h
00ADh
00F8h
(1)
(1)
Address
00F5h
Function
0 : Disables transmission
1 : Enables transmission
0 : Data in UiTB register
1 : No data in UiTB register
0 : Disables reception
1 : Enables reception
0 : No data in UiRB register
1 : Data in UiRB register
0 : Transmission buffer empty (TI=1)
1 : Transmission completed (TXEPT=1)
0 : Disables continuous receive mode
1 : Enables continuous receive mode
Set to 0.
0 : I/O ports P6_5, P6_6, P6_7
1 : CLK1, TXD1, RXD1
Set to 0.
0 : Selects SSU function
1 : Selects I
2
C bus function
After Reset
00000010b
00000010b
After Reset
Function
Function
00h
After Reset
Undefined
15. Serial Interface
RW
RW
RW
RW
RW
WO
RW
RW
RW
RO
RO
RW
—
—
—