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44
DMx820 User’s Manual
R,+0000 00
RW,+0
RW,+0
7
6
5
4
3
2
1
0
Reserved
STR2_OUT
STR1_OUT
Reserved
STR2_IN
STR1_IN
R,+00
RW,+0
RW,+0
R,+00
R,+x
R,+x
Field
Description
STR1_IN
Current State of Strobe 1
’0’ = Low
’1’ = High
STR2_IN
Current State of Strobe 2
’0’ = Low
’1’ = High
STR1_OUT
Value to drive on Strobe 1 when an output
’0’ = Low
’1’ = High
STR2_OUT
Value to drive on Strobe 2 when an output
’0’ = Low
’1’ = High
STR1_TRI
Selects Input or Output for strobe 1
’0’ = Input
’1’ = Output
STR2_TRI
Selects Input or Output for strobe 2
’0’ = Input
’1’ = Output
6.3.3
82C54
T
IMER
C
OUNTER
C
ONTROL
The Timer/Counter Control section is used to select the clock, gates and interrupt sources for the 82C54 Timer/Counters. The actual
Timer/Counter registers are found in the 82C54 Timer Counter n section on page 61.
TC_ID
ID register to identify the Timer/Counter Block.
15
0
ID_Register
R
Field
Description
ID_Register15:0]
Value of 0x1001 indicates Timer Counter Control Block
TC_INT
Enable and status for the interrupts generated by the 82C54 Timer Counters
15
14
13
8
7
6
5
0
Reserved
INT_STAT[5:0]
Reserved
INT_ENA[5:0]
R,+00
RC,+0
R,+00
RW,+0
Field
Description
INT_STAT[5:0]
Interrupt Status
– ‘1’ = Interrupt condition has occurred.
Write ‘1’ to clear. Interrupts are asserted on the
positive edge of the clock.
