R5F21257SNFP#U0 Renesas Electronics America, R5F21257SNFP#U0 Datasheet - Page 439

• 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
19.5
19.5.1
Table 19.7
VCC,VSS
RESET
P4_6/XIN
P4_7/XOUT
P4_3/XCIN
P4_4/XCOUT
P0_0 to P0_7
P1_0 to P1_7
P2_0 to P2_7
P3_0, P3_1, P3_3 to
P3_5, P3_7
P4_2/VREF, P4_5
P6_0 to P6_5
MODE
P6_6
P6_7
In standard serial I/O mode, the user ROM area can be rewritten while the MCU is mounted on-board by using a
serial programmer which is suitable for the MCU.
There are three types of Standard serial I/O modes:
This MCU uses Standard serial I/O mode 2 and Standard serial I/O mode 3.
Refer to Appendix 2. Connection Examples between Serial Writer and On-Chip Debugging Emulator.
Contact the manufacturer of your serial programmer for details. Refer to the user’s manual of your serial
programmer for instructions on how to use it.
Table 19.7 lists the Pin Functions (Flash Memory Standard Serial I/O Mode 2), Table 19.8 lists the Pin Functions
(Flash Memory Standard Serial I/O Mode 3), and Figure 19.17 shows Pin Connections for Standard Serial I/O
Mode 3.
After processing the pins shown in Table 19.8 and rewriting the flash memory using the programmer, apply “H” to
the MODE pin and reset the hardware to run a program in the flash memory in single-chip mode.
• Standard serial I/O mode 1 ............Clock synchronous serial I/O used to connect with a serial programmer
• Standard serial I/O mode 2 ............Clock asynchronous serial I/O used to connect with a serial programmer
• Standard serial I/O mode 3 ............Special clock asynchronous serial I/O used to connect with a serial
The ID code check function determines whether the ID codes sent from the serial programmer and those written
in the flash memory match (refer to 19.3 Functions to Prevent Rewriting of Flash Memory).
Standard Serial I/O Mode
Feb 29, 2008
Pin
ID Code Check Function
Pin Functions (Flash Memory Standard Serial I/O Mode 2)
Power input
Reset input
P4_6 input/clock input
P4_7 input/clock output I/O
P4_3 input/clock input
P4_4 input/clock output I/O
Input port P0
Input port P1
Input port P2
Input port P3
Input port P4
Input port P6
MODE
TXD output
RXD input
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I/O
Apply the voltage guaranteed for programming and
erasure to the VCC pin and 0 V to the VSS pin.
Reset input pin.
Connect a ceramic resonator or crystal oscillator
between the XIN and XOUT pins.
Connect crystal oscillator between pins XCIN and
XCOUT.
Input “H” or “L” level signal or leave the pin open.
Input “H” or “L” level signal or leave the pin open.
Input “H” or “L” level signal or leave the pin open.
Input “H” or “L” level signal or leave the pin open.
Input “H” or “L” level signal or leave the pin open.
Input “H” or “L” level signal or leave the pin open.
Input “L” level signal.
Serial data output pin.
Serial data input pin.
Description
19. Flash Memory