RX610 Group
26. ROM (Flash Memory for Code Storage)
R01UH0032EJ0120 Rev.1.20
Page 834 of 1006
Feb 20, 2013
FEKEY[7:0] Bits (Key Code)
These bits enable or disable rewriting of the FENTRYD, FENTRY1*, and FENTRY0 bits.
Data written to the FEKEY[7:0] bits is not retained.
Note: * Cannot be used in a product whose ROM size is equal to or smaller than 1 Mbyte.
Table 26.4 Correspondence of FENTRY1 and FENTRY0 Bits in Each Product
Product Code
ROM Size
FENTRY1
Bit
*
1
FENTRY0
Bit
FCU Mode
Target Addresses
R5F56108
2 Mbytes
0
0
ROM read mode
Read addresses: FFE0 0000h to FFFF FFFFh
0
1
ROM P/E mode
Programming/erasure addresses: 00F0 0000h to
00FF FFFFh
Access disabled addresses: FFE0 0000h to
FFFF FFFFh
1
0
Programming/erasure addresses: 00E0 0000h to
00EF FFFFh
Access disabled addresses: FFE0 0000h to
FFFF FFFFh
1
1
Do not set.
R5F56107
1.5 Mbytes
0
0
ROM read mode
Read addresses: FFE8 0000h to FFFF FFFFh
0
1
ROM P/E mode
Programming/erasure addresses: 00F0 0000h to
00FF FFFFh
Access disabled addresses: FFE8 0000h to
FFFF FFFFh
1
0
Programming/erasure addresses: 00E8 0000h to
00EF FFFFh
Access disabled addresses: FFE8 0000h to
FFFF FFFFh
1
1
Do not set.
R5F56106
1 Mbyte
Unusable
*
2
0
ROM read mode
Read addresses: FFF0 0000h to FFFF FFFFh
Unusable
*
2
1
ROM P/E mode
Programming/erasure addresses: 00F0 0000h to
00FF FFFFh
Access disabled addresses: FFF0 0000h to
FFFF FFFFh
R5F56104
768 Kbytes Unusable
*
2
0
ROM read mode
Read addresses: FFF4 0000h to FFFF FFFFh
Unusable
*
2
1
ROM P/E mode
Programming/erasure addresses: 00F4 0000h to
00FF FFFFh
Access disabled addresses: FFF4 0000h to
FFFF FFFFh
Notes: 1. Cannot be used in a product whose ROM size is equal to or smaller than 1 Mbyte.
2. This is a reserved bit in the R5F56106 and R5F56104. The write value should always be 0.