6
6-8
INTERNAL MEMORY
32180 Group User’s Manual (Rev.1.0)
FPROT = 0
FENTRY = 1
YES
NO
FENTRY = 1
FPROT = 1
FPROT is not set to 1 if a write cycle
to any other area occurs during this time.
FPR
O
T = 0
FPR
O
T =
1
Figure 6.4.1 Protection Unlocking Flow
6.4 Registers Associated with the Internal Flash Memory
Flash Control Register 2 (FCNT2)
<Address: H’0080 01E3>
9
10
11
12
13
14
b15
b8
FPROT
0
0
0
0
0
0
0
0
<After reset: H’00>
b
Bit Name
Function
R
W
8–14
No function assigned. Fix to "0".
0
0
15
FPROT
0: Protection by lock bit effective
R
W
Unlock bit
1: Protection by lock bit invalidated
Flash Control Register 2 (FCNT2) controls invalidation of the internal flash memory protection by a lock bit
(protection against programming/erase operation). Protection of the internal flash memory is invalidated by
setting the FPROT bit to "1", so that any blocks protected by a lock bit can now be programmed or erased.
To set the FPROT bit to "1", write "0" and then "1" to the FPROT bit in succession while the FENTRY bit = "1". To
clear the FPROT bit to "0", write "0" to the FPROT bit.
If one of the following operations is attempted, the FPROT bit is cleared to "0".
1) Writing "0" to the FPROT bit
2) Entering a low-level signal to the FP pin
3) Clearing the FENTRY bit to "0"
4) Entering a low-level signal to the RESET# pin
Summary of Contents for M32R/ECU Series
Page 17: ...12 This page is blank for reasons of layout...
Page 712: ...CHAPTER 18 OSCILLATOR CIRCUIT 18 1 Oscillator Circuit 18 2 Clock Generator Circuit...
Page 794: ...CHAPTER 22 TYPICAL CHARACTERISTICS...
Page 796: ...APPENDIX 1 MECHANICAL SPECIFICAITONS Appendix 1 1 Dimensional Outline Drawing...
Page 798: ...APPENDIX 2 INSTRUCTION PROCESSING TIME Appendix 2 1 32180 Instruction Processing Time...
Page 802: ...APPENDIX 3 PROCESSING OF UNUSED PINS Appendix 3 1 Example Processing of Unused Pins...
