R5F21258SNFP#U0 Renesas Electronics America, R5F21258SNFP#U0 Datasheet - Page 119

• Manufacturer Part Number: R5F21258SNFP#U0
• Description: IC R8C/25 MCU FLASH 52LQFP
• Manufacturer: Renesas Electronics America
• Series: R8C/2x/25r

Specifications of R5F21258SNFP#U0

• Core Size: 16/32-Bit
• Program Memory Size: 64KB (64K x 8)
• Core Processor: R8C
• Speed: 20MHz
• Connectivity: I²C, LIN, SIO, SSU, UART/USART
• Peripherals: POR, Voltage Detect, WDT
• Number Of I /o: 41
• Program Memory Type: FLASH
• Ram Size: 3K 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
• No. Of I/o's: 41
• Ram Memory Size: 3KB
• Cpu Speed: 20MHz
• No. Of Timers: 4
• Digital Ic Case Style: LQFP
• Supply Voltage Range: 2.2V To 5.5V
• Embedded Interface Type: I2C, UART
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: YMCRPR8C25 - REF PLATFORM MOTOR CTRL R8C/25R0K521256S000BE - KIT EVAL STARTER FOR R8C/25
• Eeprom Size: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

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
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—
—
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