Filter
Top Products
354
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)
Figure 16.3-5 Address Comparison EN Register (WREN)
WREN
bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0
0046
H
EN01 EN00 ------00
B
R/W R/W
Address
Initial value
R/W : Readable and Writable
: Unused
Table 16.3-4 Explanation of Functions of Each Bit in Address Comparison EN Register (WREN)
Bit name Function
bit7
to
bit2
Unused bits
Undefined at read
No effect to the operation at write
bit1 EN01
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.
bit0 EN00
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.