SIS Documentation
SIS3800
Scaler/Counter
Page 15 of 39
8.2 Control Register (0x0)
The control register is in charge of the control of most of the basic properties of the SIS3800
board in write access. It is implemented via a selective J/K register, a specific function is
enabled by writing a 1 into the set/enable bit, the function is disabled by writing a 1 into the
clear/disable bit (which has a different location within the register). An undefined toggle
status will result from setting both the enable and disable bits for a specific function at the
same time.
On read access the same register represents the status register.
Bit
Function
31
reserved
30
disable IRQ source 2 (*)
29
disable IRQ source 1 (*)
28
disable IRQ source 0 (*)
27
reserved
26
reserved
25
reserved
24
clear reserved bit
23
reserved
22
enable IRQ source 2
21
enable IRQ source 1
20
enable IRQ source 0
19
reserved
18
reserved
17
reserved
16
set reserved bit
15
disable broadcast mode handshale controller (*)
14
disable broadcast mode (*)
13
disable input test mode (*)
12
disable 25 MHz test pulses (*)
11
clear input mode bit 1 (*)
10
clear input mode bit 0 (*)
9
clear IRQ test source 2
8
switch off user LED (*)
7
enable handshake controller for broadcast mode
6
enable broadcast mode
5
enable input test mode
4
enable 25 MHz test pulses
3
set input mode bit 1
2
set input mode bit 0
1
set IRQ test (source 2)
0
switch on user LED
(*) denotes the default power up or key reset state
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