R5F21257SNFP#U0 Renesas Electronics America, R5F21257SNFP#U0 Datasheet - Page 431

• 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
19.4.3
Table 19.4
Read array
Read status register
Clear status register
Program
Block erase
19.4.3.1
19.4.3.2
19.4.3.3
SRD: Status register
WA: Write address (ensure the address specified in the first bus cycle is the same address as the write
WD: Write data (8 bits)
BA: Given block address
×: Any specified address in the user ROM area
The software commands are described below. Read or write commands and data in 8-bit units.
The read array command reads the flash memory.
The MCU enters read array mode when FFh is written in the first bus cycle. When the read address is entered in
the following bus cycles, the content of the specified address can be read in 8-bit units.
Since the MCU remains in read array mode until another command is written, the contents of multiple
addresses can be read continuously.
In addition, the MCU enters read array mode after a reset.
The read status register command is used to read the status register.
When 70h is written in the first bus cycle, the status register can be read in the second bus cycle (refer to 19.4.4
Status Registers). When reading the status register, specify an address in the user ROM area.
Do not execute this command in EW1 mode.
The MCU remains in read status register mode until the next read array command is written.
The clear status register command sets the status register to 0.
When 50h is written in the first bus cycle, bits FMR06 to FMR07 in the FMR0 register and SR4 to SR5 in the
status register are set to 0.
Command
address specified in the second bus cycle.)
Feb 29, 2008
Software Commands
Read Array Command
Read Status Register Command
Clear Status Register Command
Software Commands
data (D7 to D0)
Page 412 of 485
Write
Write
Write
Write
Write
Mode
First Bus Cycle
×
×
×
WA
×
Address
FFh
70h
50h
40h
20h
(D7 to D0)
Data
Read
Write
Write
Mode
Second Bus Cycle
×
WA
BA
Address
19. Flash Memory
SRD
WD
D0h
(
D7 to D0)
Data