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Chapter 22
On-Chip Debug Function
User’s Manual U16702EE3V2UD00
22.2 Security
Function
The V850E/RS1 series have a security function that limits starting of the N-Wire emulator by comparing
an ID code written in advance to the internal ROM area with an ID code that is input when the debugger
is started, when the N-Wire emulator is connected. This function prevents a third party from reading the
internal ROM area.
(1)
ID code
Be sure to write an ID code when writing a program to the internal ROM.
The area of the ID code is 10 bytes wide and in the range of addresses 00000070H to
00000079H.
The ID code when the memory is erased is shown below.
(2)
Security bit
Bit 7 of address 00000079H enables or disables use of the N-Wire emulator.
•
Bit 7 of address 00000079H
0: Disable
1: Enable
Cautions: 1. If the value of address 00000079H is 00H to 7FH, the N-Wire emulator cannot be
connected.
2. If the value of address 00000079H is 80H to FFH, the N-Wire emulator can be
connected if the 10-byte ID code to be input when the N-Wire emulator is
connected matches.
Table 22-1:
ID Code
Address
ID Code
00000079H
FFH
00000078H
FFH
00000077H
FFH
00000076H
FFH
00000075H
FFH
00000074H
FFH
00000073H
FFH
00000072H
FFH
00000071H
FFH
00000070H
FFH
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