R5F21256SNFP#U0 Renesas Electronics America, R5F21256SNFP#U0 Datasheet - Page 430
R5F21256SNFP#U0
Manufacturer Part Number
R5F21256SNFP#U0
Description
IC R8C MCU FLASH 32K 52LQFP
Manufacturer
Renesas Electronics America
Series
R8C/2x/25r
Datasheets
1.R5F211A2SPU0.pdf
(300 pages)
2.R5F21246SDFPU0.pdf
(61 pages)
3.R5F21246SDFPU0.pdf
(527 pages)
Specifications of R5F21256SNFP#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
32KB (32K x 8)
Program Memory Type
FLASH
Ram Size
2K 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
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
R5F21256SNFP#U0R5F21256SNFP#ES
Manufacturer:
Renesas Electronics America
Quantity:
10 000
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R8C/24 Group, R8C/25 Group
Rev.3.00
REJ09B0244-0300
Figure 19.11
NOTES:
1. Set the FMR01 bit to 1 (CPU rewrite mode enabled) before setting the
2. Before switching to a different clock source for the CPU, make sure
3. Insert a 30 µs wait time in a program. Do not access to the flash
Transfer a high-speed on-chip oscillator mode, low-
speed on-chip oscillator mode (XIN clock stops), and
low-speed clock mode (XIN clock stops) program to
the RAM.
Jump to the high-speed on-chip oscillator mode, low-
speed on-chip oscillator mode (XIN clock stops), and
low-speed clock mode (XIN clock stops) program
which has been transferred to the RAM.
(The subsequent processing is executed by the
program in the RAM.)
FMSTP bit to 1.
the designated clock is stable.
memory during this wait time.
Feb 29, 2008
Low-Speed On-Chip Oscillator Mode (XIN Clock Stops) and Low-Speed Clock Mode
(XIN Clock Stops)
Process to Reduce Power Consumption in High-Speed On-Chip Oscillator Mode,
Page 411 of 485
High-speed on-chip oscillator mode,
low-speed on-chip oscillator mode
(XIN clock stops), and low-speed
clock mode (XIN clock stops)
program
Jump to a specified address in the flash memory
Turn XIN clock on → wait until oscillation
stabilizes → switch the clock source for CPU
clock
Switch the clock source for the CPU clock.
Turn XIN off
Wait until the flash memory circuit stabilizes
(30 µ s)
Write 1 to the FMSTP bit (flash memory stops.
Process in high-speed on-chip oscillator
mode, low-speed on-chip oscillator mode
(XIN clock stops), and low-speed clock
mode (XIN clock stops)
Write 0 to the FMR01 bit before writing 1
(2)
(3)
low power consumption mode)
(CPU rewrite mode enabled)
(CPU rewrite mode disabled)
Write 0 to the FMR01 bit
(flash memory operation)
Write 0 to the FMSTP bit
19. Flash Memory
(1)
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