Rainbow Electronics LM81 - Manual (Page 12)

Functional Description
(Continued)
2.1 Internal Registers of the LM81
TABLE 1. The internal registers and their corresponding internal LM81 addresses are as follows:
Register LM81 Internal Hex
Address
Power on
Value
Notes
Configuration Register 40h 0000 1000
Interrupt Status Register 1 41h 0000 0000
Interrupt Status Register 2 42h 0000 0000
Interrupt Mask Register 1 43h 0000 0000
Interrupt Mask Register 2 44h 0000 0000
CI Clear Register 46h 0000 0000
VID/Fan Divisor Register 47h 0101 XXXX The upper four bits set the divisor for Fan Counters 1
and 2. The lower four bits reflect the state of the
VID0-VID3 inputs.
Serial Bus Address Register 48h 0010 11XX The lower 2 bits reflect the state of A1 and A0, the
Serial Bus address input pins.
VID4 Register 49h 1000 000X The lower bit reflects the state of VID4 input.
Temperature Configuration
Register 4Bh 0000 0001
Extended Mode Register 1 4Ch 0100 0100
Extended Mode Register 2 4Dh 0000 0000
Value RAM DAC Data
Register 19h 1111 1111
Value RAM 20h-3Fh Contains: monitoring results (temperature, voltages,
fan counts), WATCHDOG limits, and
Company/Stepping IDs
LM81
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