Status, Control, Interrupt – C&H Technologies M222 User Manual
Page 15: Relay, Id eeprom, Figure 3. i/o registers
9
Reg. 00
Status
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Write
Read-only
Read
Not Used
BUSY
Not Used
RIRQ
BUSY Relay Busy
1
(0 = relay is busy, not stable yet (busy for 16mS after Relay Register is written))
RIRQ Relay Interrupt
2
(1 = interrupt pending)
Notes:
1. This BUSY bit is re-triggerable.
2. Reading this register does not clear a pending interrupt (RIRQ).
Reg. 02
Control
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Write
Not Used
REN
SRST
Read
Not Used
REN
SRST
REN Enable Relay Interrupt (1 = enables relay interrupt (after BUSY timer))
SRST Soft Reset (1 = initiates a soft reset)
Reg. 04
Interrupt
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Write
Not Used
Read
Not Used
RIRQ
RIRQ Relay Interrupt (1 = interrupt pending)
Note: Reading this register clears a pending interrupt.
Reg. 14
Relay
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Write
Not Used
CH3
CH2
CH1
CH0
Read
Not Used
CH3
CH2
CH1
CH0
CH0 – CH3 Channel (1 = channel open (COM-NC), 0 = channel closed (COM-NO))
Reg.
FE
ID EEPROM
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Write
Unused
CS
CLK
I/O
Read
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
I/O
I/O Data In/Out (value from the Data Out pin of the ID EEPROM)
CLK Clock (1 = forces the SK pin of the ID EEPROM high, 0 = low)
CS Chip Select (1 = selects the ID EEPROM, 0 = deselects the ID EEPROM)
Notes:
1. The ID EEPROM register allows you to access the contents of the ID EEPROM which contains
sixty-four 16-bit works of M-Module ID and VXI M-Module data.
2. CAUTION: Do not attempt to write to Bit00 of the ID EEPROM register. You could overwrite the
contents of the EEPROM.
Figure 3. I/O Registers
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