R5F21257SDFP#U0 Renesas Electronics America, R5F21257SDFP#U0 Datasheet - Page 363

• Manufacturer Part Number: R5F21257SDFP#U0
• Description: IC R8C/25 MCU FLASH 52LQFP
• Manufacturer: Renesas Electronics America
• Series: R8C/2x/25r

Specifications of R5F21257SDFP#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: -40°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 16.30
Figure 16.31
IIC bus Receive Data Register
IIC bus Shift Register
Port Mode Register
b7 b6 b5 b4
b7 b6 b5 b4
b7 b6 b5 b4
0 0
Feb 29, 2008
b3 b2 b1 b0
b3 b2 b1 b0
b3 b2
0
0
Registers ICDRR and ICDRS
PMR Register
b1
0
b0
0
Store receive data
When the ICDRS register receives 1 byte of data, the receive data is transferred to the ICDRR
register and the next receive operation is enabled.
This register is used to transmit and receive data.
The transmit data is transferred from registers ICRDT to the ICDRS and data is transmitted
from the SDA pin w hen transmitting.
After 1 byte of data received, data is transferred from registers ICDRS to ICDRR w hile
receiving.
Bit Symbol
U1PINSEL
(b3-b0)
(b6-b5)
Symbol
Symbol
Symbol
ICDRR
ICDRS
IICSEL
PMR
Page 344 of 485
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Reserved bits
Port CLK1/TXD1/RXD1 sw itch bit
Reserved bits
SSU / I
2
C bus sw itch bit
Address
Bit Name
Address
00F8h
00BFh
Function
Function
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
16. Clock Synchronous Serial Interface
2
C bus function
After Reset
After Reset
Function
00h
FFh
RW
RW
RW
RW
RW
RO
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