RX610 Group
26. ROM (Flash Memory for Code Storage)
R01UH0032EJ0120 Rev.1.20
Page 826 of 1006
Feb 20, 2013
26.2.4
FCU RAM Enable Register (FCURAME)
FCRME
b7
b6
b5
b4
b3
b2
b1
b0
Value after reset:
0
0
0
0
0
0
0
0
—
—
—
—
—
—
—
Address: 007F C454h
b15
b14
b13
b12
b11
b10
b9
b8
Value after reset:
0
0
0
0
0
0
0
0
KEY[7:0]
Bit
Symbol
Bit Name
Description
R/W
b0
FCRME
FCU RAM Enable
0: Access to the FCU RAM disabled
1: Access to the FCU RAM enabled
R/W
b7 to b1
Reserved
These bits are always read as 0. The write value should always be 0. R/W
b15 to b8
KEY[7:0]
Key Code
This bit is used to enable or disable rewriting of the FCRME bit.
R/(W)
*
Note:
*
Write data is not retained.
FCURAME is a register to enable and disable an access to the FCU RAM area.
Only specific values written to the upper byte in word access are valid. Data written to the upper byte is not retained.
When on-chip ROM is disabled, the data read from FCURAME is 00h and writing is disabled.
FCURAME is initialized by a reset.
FCRME Bit (FCU RAM Enable)
This bit is used to enable and disable an access to the FCU RAM.
Data written to the FCRME bit is valid only when it is written in word access and the KEY[7:0] bits are C4h. When
programming data to the FCU RAM, set FENTRYR to 0000h and stop the FCU.
KEY[7:0] Bits (Key Code)
These bits are used to enable or disable rewriting of the FCRME bit.
Data written to the KEY[7:0] bits is not retained.