HP E1563A, User Manual, Page: 128 / 166

128 HP E1563A and E1564A Register-Based Programming Appendix B
Sample Count Low
Word Register
Register containing the low word (2 bytes) for the sample count.
This register and the high byte in register 38
16
hold a value that can
be set by the SAMPle:COUNt command in Chapter 3. Chapter 2,
Figure 2-3 shows the relationship of the sample count and the pre-
trigger count.
Trigger Source/
Control Register
This register provides the bits that control the trigger system.
Trigger Source/Control register bits defined:
NOTE
See the section titled “Master-Slave Operation” at the end of this appendix
for more information on register programming the digitizer in a master-slave
configuration. This uses bits 5, 6, 10 and 11 of the above register.
base + 3A
16
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Write C15 C14 C13 C12 C11 C10 C9 C8 C7 C6 C5 C4 C3 C2 C1 C0
Read C15 C14 C13 C12 C11 C10 C9 C8 C7 C6 C5 C4 C3 C2 C1 C0
base + 3C
16
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Write* CMP4 CMP3 CMP2 CMP1 SLAVING
PAIR
EX_
TRIG
POS_
NEG
SOFT
TRIG
MAS-
TER
SLAVE EN_
TTL
IN/
OUT
TTL_3 TTL_1 TTL_0
Read** CMP4 CMP3 CMP2 CMP1 SLAVING
PAIR
EX_
TRIG
POS_
NEG
SOFT
TRIG
MAS-
TER
SLAVE EN_
TTL
IN/
OUT
TTL_3 TTL_1 TTL_0
*WRITE BITS (Trigger Source Register) and
**READ BITS (Trigger Control Register)
bits 0-2 TTL_n 000 = TTLT0, 001 = TTLT1, 010 = TTLT2, ... , 011 = TTLT6, 111 = TTLT7.
bit 3 IN/OUT TTLTn line is: 0 = IN, 1 = OUT.
bit 4 EN_TTL 0 = disable TTLTn, 1 = enable TTLTn
bit 5 SLAVE 0 = not a slave module, 1 = slave module.
bit 6 MASTER 0 = not a master module, 1 = master module.
bit 7 SOFT TRIG software trigger: 0 = IMMediate disabled, 1 = IMMediate enabled.
bit 8 POS_NEG trigger slope: 0 = NEG, 1 = POS.
bit 9 EX_TRIG 0 = EXTernal trigger disabled, 1 = EXTernal trigger enabled and must be
input on the “Trig” pin on the front panel D-subminiature connector.
bits 10-11 SLAVING_PAIR 00 = MASTer0/SLAVe0; 01 = MASTer2/SLAVe2;
10 = MASTer4/SLAVe4; 11 = MASTer6/SLAVe6
bits 12-15 CMP1-4 0 = INTn disabled, 1 = INTn enabled; Example: a “1” in CMP2 means the
level set in the Trigger/Interrupt Level Channel 2 Register will be used as the
INTernal trigger source.