Address Comparison En Register (Wren) - Fujitsu F2MC-8L F202RA Hardware Manual

CHAPTER 16 WILD REGISTER FUNCTION
16.3.4

Address Comparison EN Register (WREN)

The address comparison EN register (WREN) is a register that enables the operation of
wild register function for the individual wild register numbers.
■
Address Comparison EN Register (WREN)
Address
0046
WREN
H
R/W : Readable and Writable
Table 16.3-4 Explanation of Functions of Each Bit in Address Comparison EN Register (WREN)
Bit name
bit7
to Unused bits
bit2
bit1 EN01
bit0 EN00
354
Figure 16.3-5 Address Comparison EN Register (WREN)
bit7 bit6 bit5
: Unused
Undefined at read
No effect to the operation at write
When this bit is "0", the corresponding wild register function does not work.
When this bit is "1", the wild register function is enabled. If there is a match with the
address held in WRARH1 and WRARL1, the value of WRDR1, instead of ROM, is
output to the internal bus.
When this bit is "0", the corresponding wild register function does not work.
When this bit is "1", the wild register function is enabled. If there is a match with the
address held in WRARH0 and WRARL0, the value of WRDR0, instead of ROM, is
output to the internal bus.
bit4 bit3 bit2
Function
bit1 bit0
Initial value
EN01 EN00 ------00
B
R/W R/W