HI-6138_16 Datasheet, PDF (49/254 Pages) Holt Integrated Circuits – Compact Multi-Terminal Device with SPI Host Interface

HI-6138
Bit No. Mnemonic
13 BCTTA1
12 BCTTA0
11 − 10 Reserved
9
RTTTA1
8
RTTTA0
7
MTTCK3
6
MTTCK2
5
MTTCK1
4
MTTCK0
R/W Reset Function
BC Time Tag Action Bits 1-0.
After performing the action below, these host-written bits self reset to
00:
Bits 13-12 Action
00 or 11 Do Nothing.
01
Reset 16- or 32-bit BC Time Tag count to zero.
R/W 0
10
Load the 16- or 32-bit value from BC Time Tag Utility
Register(s) into the BC Time Tag Count Register(s).
If BCTT32 register bit 3 equals 0, the BC is using 16-bit time tag. The
BC Time Tag Counter uses a single register address, 0x0043. The “Bus
Controller (BC) Time Tag Utility Register (0x0045)” is used for these
operations.
If BCTT32 register bit 3 equals 1 the BC is using 32-bit time tagging,
so the BC Time Tag Counter requires two 16-bit register addresses.
The High and Low BC time tag counter words are found at 0x0044 and
0x0043 respectively. The pair of BC Time Tag Utility Registers used for
timer operations are located at register addresses 0x0046 (High word)
and 0x0045 (Low word).
R
0 These bits are not used.
RT Time Tag Action Bits 1-0.
After performing the RT time tag counter action below, these host-
written bits self reset to 00:
R/W 0
Bits 9-8
00 or 11
Action
Do Nothing.
01
Reset 16-bit RT Time Tag count to zero.
Load the 16-bit value from the RT Time Tag Utility
10
Register (0x004A) into the RT Time Tag Counter
(0x0049).
MT Time Tag Clock Selection Bits 7-4.
These three bits select the clock source for the BC and RT Time Tag
Counters from the following options:
Bits 7-6-5-4 MT Time Tag Counter Clock Source
R/W 0
0-0-0-0
0-0-0-1
0-0-1-0
0-0-1-1
0-1-0-0
0-1-0-1
0-1-1-0
0-1-1-1
1-x-x-x
Time Tag Counter Disabled.
External clock provided at the MTTCLK input pin.
Internally generated 2μs clock.
Internally generated 4μs clock.
Internally generated 8μs clock.
Internally generated 16μs clock.
Internally generated 32μs clock.
Internally generated 64μs clock.
Internally generated 100ns clock.
HOLT INTEGRATED CIRCUITS
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