R5F21257SYFP#U0 Renesas Electronics America, R5F21257SYFP#U0 Datasheet - Page 119
![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
11. Protection
The protection function protects important registers from being easily overwritten when a program runs out of control.
Figure 11.1 shows the PRCR Register. The registers protected by the PRCR register are listed below.
Figure 11.1
Protect Register
• Registers protected by PRC0 bit: Registers CM0, CM1, OCD, FRA0, FRA1, and FRA2
• Registers protected by PRC1 bit: Registers PM0 and PM1
• Registers protected by PRC2 bit: PD0 register
• Registers protected by PRC3 bit: Registers VCA2, VW0C, VW1C, and VW2C
b7 b6 b5 b4
NOTE:
1. This bit is set to 0 after w riting 1 to the PRC2 bit and executing a w rite to any address. Since the other bits are not
0 0
set to 0, set them to 0 by a program.
Feb 29, 2008
b3 b2 b1 b0
PRCR Register
Bit Symbol
(b5-b4)
(b7-b6)
Symbol
PRCR
PRC0
PRC1
PRC2
PRC3
Page 100 of 485
—
—
Protect bit 0
Protect bit 1
Protect bit 2
Protect bit 3
Reserved bits
Reserved bits
Address
Bit Name
000Ah
Writing to registers CM0, CM1, OCD, FRA0, FRA1,
and FRA2 is enabled.
0 : Disables w riting
1 : Enables w riting
Writing to registers PM0 and PM1 is enabled.
0 : Disables w riting
1 : Enables w riting
Writing to the PD0 register is enabled.
0 : Disables w riting
1 : Enables w riting
Writing to registers VCA2, VW0C, VW1C, and
VW2C is enabled.
0 : Disables w riting
1 : Enables w riting
Set to 0.
When read, the content is 0.
(1)
After Reset
Function
00h
11. Protection
RW
RW
RW
RW
RW
RW
RO
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