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CHAPTER 16 WILD REGISTER FUNCTION
16.2 Configuration of the Wild Register Function
The wild register function consists of the following two blocks:
Memory area part
• Data setting register (WRDR)
• Higher address set register (WRARH)
• Lower address set register (WRARL)
Control circuit part
■ Block Diagram of the Wild Register Function
Figure 16.2-1 Block Diagram of Wild Register Function
● Memory area part
This part consists of the data setting register, higher address set register ("H" address), and lower address
set register ("L" address). Set the address and data to be replaced by the wild register. The MB89202/
F202RA series incorporates two bytes for each register.
● Control circuit part
This part compares the data held in the address set registers and the actual data on the address bus. If it
detects a match, it sets the data in the data setting register to the data bus. The control circuit part can
control the operation by the address comparison EN register.
(WRDR)
Incorporated ROM/RAM
Wild register function
Memory area part
Control circuit part
Data setting register
Access control circuit
Address comparison
EN register (WREN)
Decoder
Internal data bus
Address
Higher address set
register (WRARH)
Matching signal
Address comparison
Lower address set
register (WRARL)
Access control