CH Tech M222 user manual Status, Control, Interrupt, Relay, Id Eeprom, I/O Registers

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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.							ID EEPROM
FE
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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