r5f21346mnfp Renesas Electronics Corporation., r5f21346mnfp Datasheet - Page 175

• Manufacturer Part Number: r5f21346mnfp
• Description: Single-chip Mcus Incorporates The R8c Cpu Core
• Manufacturer: Renesas Electronics Corporation.

R8C/34M Group
R01UH0131EJ0100 Rev.1.00
Jun 21, 2011
10. Protection
The protection function protects important registers from being easily overwritten if a program runs out of control.
The registers protected by the PRCR register are as follows:
• Registers protected by PRC0 bit: Registers CM0, CM1, CM3, OCD, FRA0, FRA1, FRA2, and FRA3
• Registers protected by PRC1 bit: Registers PM0 and PM1
• Registers protected by PRC2 bit: PD0 register
• Registers protected by PRC3 bit: Registers OCVREFCR, VCA2, VD1LS, VW0C, VW1C, and VW2C
10.1
10.1.1
Note:
1. Bits PRC0, PRC1, and PRC3 are not set to 0 even after setting them to 1 (write enabled) and writing to the SFR
After Reset
Bit
b0
b1
b2
b3
b4
b5
b6
b7
Address 000Ah
areas. Set these bits to 0 by a program.
Symbol
Register
Symbol
PRC0
PRC1
PRC2
PRC3
Bit
Protect Register (PRCR)
—
—
—
—
b7
—
0
Protect bit 0
Protect bit 1
Protect bit 2
Protect bit 3
Reserved bits
Nothing is assigned. If necessary, set to 0. When read, the content is 0.
Bit Name
b6
—
0
b5
—
0
Enables writing to registers CM0, CM1, CM3, OCD, FRA0,
FRA1, FRA2, and FRA3.
0: Write disabled
1: Write enabled
Enables writing to registers PM0 and PM1.
0: Write disabled
1: Write enabled
Enables writing to the PD0 register.
0: Write disabled
1: Write enabled
Enables writing to registers OCVREFCR, VCA2, VD1LS,
VW0C, VW1C, and VW2C.
0: Write disabled
1: Write enabled
Set to 0.
b4
—
0
PRC3
b3
0
(1)
(1)
(1)
PRC2
b2
0
Function
PRC1
b1
0
PRC0
b0
0
Page 143 of 740
10. Protection
R/W
R/W
R/W
R/W
R/W
R/W
—