R5F21238DFP#U0 Renesas Electronics America, R5F21238DFP#U0 Datasheet - Page 117

• Manufacturer Part Number: R5F21238DFP#U0
• Description: IC R8C/23 MCU FLASH 48-LQFP
• Manufacturer: Renesas Electronics America
• Series: R8C/2x/23r

Specifications of R5F21238DFP#U0

• Core Size: 16/32-Bit
• Program Memory Size: 64KB (64K x 8)
• Peripherals: POR, Voltage Detect, WDT
• Core Processor: R8C
• Speed: 20MHz
• Connectivity: CAN, I²C, LIN, SIO, SSU, UART/USART
• Number Of I /o: 41
• Program Memory Type: FLASH
• Ram Size: 3K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 12x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-LQFP
• No. Of I/o's: 41
• Ram Memory Size: 3KB
• Cpu Speed: 20MHz
• No. Of Timers: 4
• Digital Ic Case Style: LQFP
• Embedded Interface Type: CAN, I2C, UART
• Rohs Compliant: Yes
• Cpu Family: R8C
• Device Core Size: 16b
• Frequency (max): 20MHz
• Interface Type: I2C/UART
• Total Internal Ram Size: 3KB
• # I/os (max): 41
• Number Of Timers - General Purpose: 5
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 3V
• On-chip Adc: 12-chx10-bit
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 48
• Package Type: LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: RCDK8C - KIT DEV EVAL FOR CAN R8C/23R0K521237S000BE - KIT DEV RSK R8C/23R0E521237CPE00 - EMULATOR COMPACT R8C/20/21/22/23
• Eeprom Size: -
• Lead Free Status / Rohs Status: Compliant

R8C/22 Group, R8C/23 Group
Rev.2.00 Aug 20, 2008
REJ09B0251-0200
11. Protection
Protection function protects important registers from being easily overwritten when a program runs out of control.
Figure 11.1 shows the PRCR Register. The following lists the registers protected by the PRCR register.
Figure 11.1
Protect Register
• Registers protected by PRC0 bit: CM0, CM1, OCD, FRA0, FRA1, FRA2, and CCLKR registers
• Registers protected by PRC1 bit: PM0 and PM1 registers
• Registers protected by PRC2 bit: PD0 register
• Registers protected by PRC3 bit: VCA2, VW1C and VW2C registers
b7 b6 b5 b4
NOTE:
1.
0 0
This bit is set to 0 after w riting 1 to the PRC2 bit and executing w riting to any address.
Since the other bits are not set to 0, set to 0 by a program.
b3 b2 b1 b0
PRCR Register
Bit Symbol
(b5-b4)
(b7-b6)
Symbol
PRCR
PRC0
PRC1
PRC2
PRC3
Page 95 of 501
—
—
Protect bit 0
Protect bit 1
Protect bit 2
Protect bit 3
Reserved bits
Reserved bits
Address
Bit Name
000Ah
Writing to the CM0, CM, OCD, FRA0, FRA1, FRA2,
and CCLKR registers is enabled
0 : Disables w riting
1 : Enables w riting
Writing to the PM0 and PM1 registers 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 the VCA2, VW1C and VW2C registers 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