R5F21257SYFP#U0 Renesas Electronics America, R5F21257SYFP#U0 Datasheet - Page 309
![MCU 2KB FLASH 48K 52-LQFP](/photos/28/61/286101/52-lqfp_sml.jpg)
R5F21257SYFP#U0
Manufacturer Part Number
R5F21257SYFP#U0
Description
MCU 2KB FLASH 48K 52-LQFP
Manufacturer
Renesas Electronics America
Series
R8C/2x/25r
Specifications of R5F21257SYFP#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 ~ 105°C
Package / Case
52-LQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
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R8C/24 Group, R8C/25 Group
Rev.3.00
REJ09B0244-0300
Figure 15.3
UARTi Receive Buffer Register (i = 0 or 1)
UARTi Transmit Buffer Register (i = 0 or 1)
(b15)
(b15)
b7
NOTES:
b7
NOTES:
1.
2.
1.
2.
Read out the UiRB register in 16-bit units.
Bits SUM, PER, FER, and OER are set to 0 (no error) w hen bits SMD2 to SMD0 in the UiMR register are set to 000b
(serial interface disabled) or the RE bit in the UiC1 register is set to 0 (receive disabled). The SUM bit is set to 0 (no
error) w hen bits PER, FER, and OER are set to 0 (no error). Bits PER and FER are set to 0 even w hen the higher byte
of the UiRB register is read out.
Also, bits PER and FER are set to 0 w hen reading the high-order byte of the UiRB register.
When the transfer data length is 9 bits, w rite data to high byte first, then low byte.
Use the MOV instruction to w rite to this register.
Feb 29, 2008
Registers U0TB to U1TB and U0RB to U1RB
(b8)
(b8)
b0
b0
b7
b7
Bit Symbol
(b11-b9)
(b7-b0)
(b15-b9)
(b8-b0)
SUM
(b8)
OER
FER
PER
Page 290 of 485
—
—
—
—
—
Nothing is assigned. If necessary, set to 0.
When read, the content is undefined.
Overrun error flag
Framing error flag
Parity error flag
Error sum flag
Transmit data
Nothing is assigned. If necessary, set to 0.
When read, the content is undefined.
b0
b0
Symbol
U0RB
U1RB
Symbol
U0TB
U1TB
(1)
(1, 2)
(2)
Bit Name
(2)
—
—
(2)
(2)
00A7h-00A6h
00AFh-00AEh
Address
Function
00ABh-00AAh
00A3h-00A2h
Address
Receive data (D7 to D0)
Receive data (D8)
0 : No overrun error
1 : Overrun error
0 : No framing error
1 : Framing error
0 : No parity error
1 : Parity error
0 : No error
1 : Error
After Reset
Undefined
Undefined
Function
After Reset
Undefined
Undefined
15. Serial Interface
WO
RW
RW
RO
RO
RO
RO
RO
RO
—
—
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