rtd DM35820HR, User Manual, Page: 45 / 82

RTD Embedded Technologies, Inc.
| www.rtd.com 45 DMx820 User’s Manual
Field Description
INT_ENA[5:0] Interrupt Enable
– ‘1’ = Interrupt is enabled, ‘0’ = disabled
Interrupt source are:
5
TC B2
4 TC B1
3 TC B0
2 TC A2
1 TC A1
0 TC A0
TC_xy_CONTROL
This register selects the input clock and gate source for the 82C54 Timer Counters. Note that the maximum input frequency to the
Timer/Counters is 10 MHz. Also, no provision is made in hardware to prevent a Timer/Counter from using its own output clock as its input
clock.
15 13 12 8 7 4 3 0
Reserved GATE_SEL[4:0] Reserved CLOCK_SEL[3:0]
R,+00 RW,+0 R,+00 RW,+0
Field Description
GATE_SEL[4:0] Selects the gate input to this channel of the Timer/ Counter.
Value definitions are:
31 Port2[15]
…
16 Port2[0]
15 Inverted Strobe2
14 Inverted Strobe1
13 Strobe2
12 Strobe1
11 Prog. Clock 3
10 Prog. Clock 2
9 Prog. Clock 1
8 Prog. Clock 0
7 82C54 TC B2
6 82C54 TC B1
5 82C54 TC B0
4 82C54 TC A2
3 82C54 TC A1
2 82C54 TC A0
1
‘1’
0
‘0’
CLOCK_SEL[3:0] Selects the clock input to this channel of the Timer/ Counter.
Value definitions are:
15 Inverted Strobe2
14 Inverted Strobe1
13 Strobe2
12 Strobe1
11 Prog. Clock 3
10 Prog. Clock 2
9 Prog. Clock 1
8 Prog. Clock 0
7 82C54 TC B2
6 82C54 TC B1
5 82C54 TC B0
4 82C54 TC A2
3 82C54 TC A1
2 82C54 TC A0
1 Reserved
0 5 MHz