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參數(shù)資料
| 型號： | IP82C54Z |
| 廠商： | INTERSIL CORP |
| 元件分類： | XO, clock |
| 英文描述： | CMOS Programmable Intervel Timer |
| 中文描述： | 3 TIMER(S), PROGRAMMABLE TIMER, PDIP24 |
| 封裝： | LEAD FREE, PLASTIC, MS-011AA, DIP-24 |
| 文件頁數(shù)： | 15/22頁 |
| 文件大小： | 395K |
| 代理商： | IP82C54Z |
15
Counter will be loaded with new count on the next CLK pulse
and counting will continue from there.
Operation Common To All Modes
Programming
When a Control Word is written to a Counter, all Control
Logic, is immediately reset and OUT goes to a known initial
state; no CLK pulses are required for this.
Gate
The GATE input is always sampled on the rising edge of
CLK. In Modes 0, 2, 3 and 4 the GATE input is level
sensitive, and logic level is sampled on the rising edge of
CLK. In modes 1, 2, 3 and 5 the GATE input is rising-edge
sensitive. In these Modes, a rising edge of Gate (trigger)
sets an edge-sensitive flip-flop in the Counter. This flip-flop is
then sampled on the next rising edge of CLK. The flip-flop is
reset immediately after it is sampled. In this way, a trigger will
be detected no matter when it occurs - a high logic level
does not have to be maintained until the next rising edge of
CLK. Note that in Modes 2 and 3, the GATE input is both
edge-and level-sensitive.
Counter
New counts are loaded and Counters are decremented on
the falling edge of CLK.
The largest possible initial count is 0; this is equivalent to 2
16
for binary counting and 10
4
for BCD counting.
The counter does not stop when it reaches zero. In Modes 0,
1, 4, and 5 the Counter “wraps around” to the highest count,
either FFFF hex for binary counting or 9999 for BCD
counting, and continues counting. Modes 2 and 3 are
periodic; the Counter reloads itself with the initial count and
continues counting from there.
N
N
N
N
0
3
0
2
0
1
0
0
FF
FF
0
3
WR
CLK
GATE
OUT
CW = 1A LSB = 3
N
N
N
N
0
3
0
2
0
3
0
2
0
1
N
N
N
N
0
3
0
2
0
1
0
0
FF
FF
FF
FE
WR
CLK
GATE
OUT
CW = 1A LSB = 3
WR
CLK
GATE
OUT
CW = 1A LSB = 3
N
N
N
0
0
FF
FF
LSB = 5
N
0
5
0
4
FIGURE 14. MODE 5
SIGNAL
STATUS
MODES
LOW OR
GOING LOW
RISING
HIGH
0
Disables Counting
-
Enables Counting
1
-
1) Initiates
Counting
2) Resets output
after next clock
-
2
1) Disables
counting
2) Sets output
immediately high
Initiates Counting Enables Counting
3
1) Disables
counting
2) Sets output
immediately high
Initiates Counting Enables Counting
4
1) Disables
Counting
-
Enables Counting
5
-
Initiates Counting
-
FIGURE 15. GATE PIN OPERATIONS SUMMARY
MODE
MIN COUNT
MAX COUNT
0
1
0
1
1
0
2
2
0
3
2
0
4
1
0
5
1
0
NOTE:
counting.
0 is equivalent to 2
16
for binary counting and 10
4
for BCD
FIGURE 16. MINIMUM AND MAXIMUM INITIAL COUNTS
82C54
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