SIS Documentation
SIS3820
VME Scaler
Page 28 of 79
7.8 Preset value register counter group 1 (0x20)
#define SIS3820_PRESET_GROUP1
0x20
/* read/write; D32 */
The preset value for channels 1-16 is defined by this register. The preset channel select
register is used to define which of the 16 channels of the group is actually compared to the
preset value.
Bit Function
31
Preset bit 31
... ...
0
Preset bit 0
7.9 Preset value register counter group 2 (0x24)
#define SIS3820_PRESET_GROUP2
0x24
/* read/write; D32 */
The preset value for channels 17-32 is defined by this register. The preset channel select
register is used to define which of the 16 channels of the group is actually compared to the
preset value.
Bit Function
31
Preset bit 31
... ...
0
Preset bit 0
7.10 Preset Enable and Hit register (0x28)
#define SIS3820_PRESET_ENABLE_HIT
0x28
/* read/write; D32 */
This register is used to enable one or both counter groups for preset operation and provides
the information which group has reached the preset value.
Bit write Function
read Function
18
none
LNE latched preset reached status group 2
0: channel group 2 has not reached preset value
1: channel group 2 has reached preset value
17
none
preset reached status group 2
0: channel group 2 has not reached preset value
1: channel group 2 has reached preset value
16
ENABLE group 2
Status ENABLE group 2
...
2
none
LNE latched preset reached status group 1
0: channel group 1 has not reached preset value
1: channel group 1 has reached preset value
1
none
preset reached status group 1
0: channel group 1 has not reached preset value
1: channel group 1 has reached preset value
0
ENABLE group 1
Status ENABLE group 1
At power up or after key reset the register the register will read 0.
