R5F21102DFP#U0 Renesas Electronics America, R5F21102DFP#U0 Datasheet - Page 42

• Manufacturer Part Number: R5F21102DFP#U0
• Description: IC R8C MCU FLASH 8K 32LQFP
• Manufacturer: Renesas Electronics America
• Series: M16C™ M16C/R8C/Tiny/10r

Specifications of R5F21102DFP#U0

• Core Processor: R8C
• Core Size: 16-Bit
• Speed: 16MHz
• Connectivity: SIO, UART/USART
• Peripherals: LED, WDT
• Number Of I /o: 22
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-LQFP
• For Use With: R0K521134S000BE - KIT EVAL STARTER FOR R8C/13R0E521134EPB00 - KIT EMULATOR PROBE FOR PC7501R0E521134CPE00 - EMULATOR COMPACT R8C/13
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/10 Group
Rev.1.20 Jan 27, 2006
REJ09B0019-0120
7. Protection
Figure 7.1 PRCR Register
In the event that a program runs out of control, this function protects the important registers so that they
will not be rewritten easily. Figure 7.1 shows the PRCR register. The following lists the registers protected
by the PRCR register.
Set the PRC2 bit to “1” (write enabled) and then write to any address, and the PRC2 bit will be set to “0”
(write protected). The registers protected by the PRC2 bit should be changed in the next instruction after
setting the PRC2 bit to “1”. Make sure no interrupts will occur between the instruction in which the PRC2
bit is set to “1” and the next instruction. The PRC0 and PRC1 bits are not automatically set to “0” by writing
to any address. They can only be set to “0” in a program.
• Registers protected by PRC0 bit: CM0, CM1, and OCD registers
• Registers protected by PRC1 bit: PM0 and PM1 registers
• Registers protected by PRC2 bit: PD0 register
P r o t e c t r e g i s t e r
b7
N O T E S :
1 . T h e P R C 2 b i t i s s e t t o “ 0 ” b y w r i t i n g t o a n y a d d r e s s a f t e r s e t t i n g i t t o “ 1 ” . O t h e r b i t s a r e n o t s e t t o “ 0 ”
b6
b y w r i t i n g t o a n y a d d r e s s , a n d m u s t t h e r e f o r e b e s e t t o “ 0 ” i n a p r o g r a m .
b5
0
b4
0
b3
0
b2
page 30 of 180
b1
b0
B i t s y m b o l
( b 7 - b 6 )
( b 5 - b 3 )
PRC0
PRC1
PRC2
Symbol
PRCR
Reserved bit
Reserved bit
Protect bit 0
Protect bit 1
Protect bit 2
B i t n a m e
Address
000A
16
00XXX000
After reset
W h e n w r i t e , m u s t s e t t o " 0 "
When read, its content is “0”.
E n a b l e w r i t e t o C M 0 , C M 1 , O C D
r e g i s t e r s
0 : W r i t e p r o t e c t e d
1 : W r i t e e n a b l e d
Enable write to PM0, PM1
registers
0 : W r i t e p r o t e c t e d
1 : W r i t e e n a b l e d
Enable write to PD0 register
0 : Write protected
1 : Write enabled
2
Function
1
7. Protection
RW
RW
RW
R W
R W
RO