Datasheet

AD9920A
Rev. B | Page 101 of 112
Table 59. Shutter and GPO Registers
Address
Data
Bits
Default
Value
Update
Type Name Description
0x70 [2:0] 0 VD PRIMARY_ACTION Select action for primary and secondary counters.
[5:3] 0 SECOND_ACTION 0 = idle (do nothing): autoreset on VD.
1 = activate counter (primary: automatic exposure/read).
2 = RapidShot: wrap/repeat counter.
3 = ShotTimer: delay start of count.
4 = ShotTimer with RapidShot.
5 = SLR exposure (manual).
6 = SLR read (manual).
7 = force to idle.
[13:6] 0 MANUAL_TRIG
1: manual trigger for GP signals when Protocol 1 is selected.
Bit 6: GP1 manual trigger.
Bit 13: GP8 manual trigger.
0x71 [12:0] 0 VD PRIMARY_MAX Primary counter maximum value.
[24:13] 0 SECOND_MAX Secondary counter maximum value.
[27:25] 0 VDHD_MASK Mask VD/HD during counter operation.
0x72 [12:0] 0 VD PRIMARY_DELAY
Number of fields to delay before the next primary count (exposure)
starts. For ShotTimer with RapidShot, the delay value is used between
each repetition.
[13] 0 PRIMARY_SKIP
For ShotTimer with RapidShot, use the primary delay value only before
the first count (exposure).
[26:14] 0 SECOND_DELAY
Number of fields to delay before the next secondary count (exposure)
starts. For ShotTimer with RapidShot, the delay value is used between
each repetition.
[27] 0 SECOND_SKIP
For ShotTimer with RapidShot, use the secondary delay value only
before the first count (exposure).
0x73 [2:0] 0 VD GP1_PROTOCOL Selects protocol for each general-purpose signal.
[5:3] 0 GP2_PROTOCOL 0 = idle.
[8:6] 0 GP3_PROTOCOL
1 = no counter association. Use MANUAL_TRIG bits to enable each GP
signal.
[11:9] 0 GP4_PROTOCOL 2 = test use only.
[14:12] 0 GP5_PROTOCOL 3 = test use only.
[17:15] 0 GP6_PROTOCOL 4 = link to mode counter.
[20:18] 0 GP7_PROTOCOL 5 = link to primary counter.
[23:21] 0 GP8_PROTOCOL 6 = link to secondary counter.
7 = keep on.
0x74 [12:0] 0 VD SGMASK_NUM Exposure duration (number of fields to mask SG) for LS operation.
[25:13] 0 VD/SG SUBCKMASK_NUM Exposure + readout duration (number of fields to mask SUBCK) for LS.
[26] 0x01 VD/SG SUBCKTOG_UPDATE
0 = SUBCK HP toggles and the registers involved in SUBCK masking
(Register 0x78 and Register 0x74, Bits[27:13]) are updated at SG line.
1 = updated at update line (VD updated).
[27] 0 VD/SG SUBCKMASK_SKIP1 Skip the SUBCK mask for the first exposure field only.
0x75 [0] 0 VD/SG Test Test purpose only. Must be set to 0.
[13:1] 0 SUBCKSUPPRESS Number of lines after VSG line to begin SUBCK pulses.
[26:14] 0 SUBCKNUM Number of SUBCK pulses per field. Must be set less than VDLEN.
[27] 0 SG_SUPPRESS Suppress the SG and allow SUBCK to finish at SUBCKNUM.
0x76 [0] 0 VD/SG SUBCK_POL SUBCK start polarity.
[1] 0 TESTMODE Test use only. Must be set to 0.
0x77 [13:0] 0 VD/SG SUBCK_TOG1 SUBCK Toggle Position 1.
[27:14] 0 SUBCK_TOG2 SUBCK Toggle Position 2.
0x78 [13:0] 0 VD/SG SUBCKHP_TOG1 High precision SUBCK Toggle Position 1.
[27:14] 0 SUBCKHP_TOG2 High precision SUBCK Toggle Position 2.
0x79 [25:0] 0 VD TESTMODE Test use only. Must be set to 0.