Motorola MVME2300 Series - Manual (Page 57)

ISA Local Resource Bus
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The NVRAM/RTC Address Strobe 0 register latches the lower 8 bits of the
address and the NVRAM/RTC Address Strobe 1 register latches the upper
5 bits of the address.
The NVRAM and RTC are accessed through the above three registers.
When accessing an NVRAM/RTC location, follow this procedure:
1. Write the low address (A7-A0) of the NVRAM to the
NVRAM/RTC STB0 register,
2. Write the high address (A15-A8) of the NVRAM to the
NVRAM/RTC STB1 register, and
3. Then read or write the NVRAM/RTC Data Port.
Refer to the M48T59 Data Sheet for additional details and programming
information.
Module Configuration and Status Registers
Four registers provide the configuration and status information about the
board. These registers are listed in the following table:
Table 1-17. M48T59/559 Access Registers
PCI I/O Address Function
0000 0074 NVRAM/RTC Address Strobe 0 (A7 - A0)
0000 0075 NVRAM/RTC Address Strobe 1 (A15 - A8)
0000 0077 NVRAM/RTC Data Register
Table 1-18. Module Configuration and Status Registers
PCI I/O Address Function
0000 0800 CPU Configuration Register
0000 0802 Base Module Feature Register
0000 0803 Base Module Status Register
0000 08C0 - 0000 08C1 Seven-Segment Display Register