
42
Register Descriptions
Control Register
The offset of Control Register is 02
h
. It is a Read/Write register
•
EENABLE: 1 - Enable External interrupt;
•
RENABLE: 1 - Enable circuit interrupt (After BUSY timer);
•
Soft Reset: 1 - Soft Reset Agilent E2259A.
When power-on or reset, all bits of Control Register are set to zero.
Interrupt Register
The offset of Interrupt Register is 04
h
. It is a Read only register.
•
RIRQX: 1 - Circuit interrupt
BUSY Delay Timer
Register
The offset of BUSY Delay Timer Register is 12
h
. It is a write only register.
The value of this register determines the delay time between command
execution and asserting interrupt.The delay time is determined by the
formula:
Delay Time = (Register value + 1) * 0.031875 ms
where: Register value can be from 0000
h
through FFFF
h
•
The default value of Delay Time is 13 ms (register value = 407
10
or
197
h
).
I/O Register
The offset of the Input/Output Register is 14
h
. Reading this Register will get
the status of TR0 - TR15 lines.Writing to this Register will latch
MD15-MD0 into two 74ACTQ273 latches (BC0 - BC15).
•
Writing a 1 sets bit high; writing a 0 sets bit low.
b+02
h
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Write
Reserved
EENABLE
RENABLE
Soft
Reset
Read
Reserved
EENABLE
RENABLE
Soft
Reset
b+04
h
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Write
Reserved
Read
Reserved
RIRQX
b+14
h
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Write
Output Bits (BC15 - BC0)
Read
Input Bits (TR15 - TR0)
Содержание E2259A
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