Apex Data Sheet
892-00000-000-05-201302 11
All data values are 16 bit values transferred in MSB | LSB order. This command requires 100us to
complete; the calling program needs to delay for this length of time before issuing another command.
In some instances, other commands will also write to these registers (i.e., integration time), in these
cases the user has the options of setting the parameters through 2 different methods.
Byte Format
Byte 0 Byte 1 Byte 2 Byte 3
0x6A Register Value Data Byte LSB Data Byte MSB
Register
Address
Description
Default
Value
Min
Value
Max
Value
Time Base
0x00
*
Master Clock Counter
Divisor
6 1 0xFFFF 48MHz
0x04
FPGA Firmware
Version (Read Only)
0x10
*
Integration Period
LSB Divisor
1000 0 0xFFFF 1MHz
0x14
Set base_clk or
base_clkx2
0: base_clk
1: base_clkx2
1 0 1 N/A
0x18
*
Integration Period
MSB Divisor
10 0 0xFFFF
Integration Period
Base Clock
(see Register 0x10)
0x20
*
Reserved
0x28 Reserved
0x2C
&*
Reserved
0x30 Reserved
0x58 Reserved
0x60
Bit*(0) => Reserved 1 0 1 N/A
Bit*(1) => Reserved
DO NOT MODIFY
0 0 1 N/A
Bit*(2) => Reserved
DO NOT MODIFY
1 0 1 N/A
Bit*(3) => Reserved
DO NOT MODIFY
0 0 1 N/A
Bit*(4) => Reserved
DO NOT MODIFY
0 0 1 N/A
Notes: * - User should not change these values because spectrometer performance can be affected. This
information is included just for completeness
& - These values are controlled by other command interfaces to Apex (i.e., Set integration time).
