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參數(shù)資料
| 型號(hào)： | UPD1724x |
| 廠商： | NEC Corp. |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCONTROLLERS FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTERS |
| 中文描述： | 4位單片微控制器的小型通用兩用紅外遙控遞質(zhì) |
| 文件頁數(shù)： | 54/102頁 |
| 文件大?。?/td> | 461K |
| 代理商： | UPD1724X |
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54
Data Sheet U15002EJ1V0DS
μ
PD17240, 17241, 17242, 17243, 17244, 17245, 17246
.
Setting carrier frequency and duty factor
Where the system clock frequency is f
X
, carrier frequency is f
C
, and carrier generation clock is Rf
X
:
When Rf
X
= f
X
/2:
When Rf
X
= f
X
:
When Rf
X
= 2f
X
:
(division ratio) = f
X
/(2
×
f
C
)
(division ratio) = f
X
/f
C
(division ratio) = 2f
X
/f
C
is divided into m:n and is set in the modulo registers as follows:
High-level period set value= {
Low-level period set value = {
×
m/(m + n)}
–
1
×
n/(m + n)}
–
1
Example
Where f
C
= 38 kHz, duty factor (high-level period) = 1/3, f
X
= 4 MHz, and Rf
X
= 2f
X
:
= 2
×
4 MHz/38 kHz = 210.5
m:n = 1:2
From the above, the value of the modulo register is:
High-level period .
Low-level period. .
Therefore, the carrier frequency is 38.10 kHz.
Table 5-1. Carrier Frequency List
(1) Where f
X
= 4 MHz and Rf
X
= f
X
/2
Set Value
t
H
(
μ
s)
t
L
(
μ
s)
1/f
C
(
μ
s)
f
C
(kHz)
Duty
NRZHTMM
NRZLTMM
00H
00H
0.5
0.5
1.0
1000
1/2
01H
02H
1.0
1.5
2.5
400
2/5
04H
04H
2.5
2.5
5.0
200
1/2
09H
09H
5.0
5.0
10.0
100
1/2
0FH
10H
8.0
8.5
16.5
60.6
1/2
0FH
21H
8.0
17.0
25.0
40.0
1/3
11H
21H
9.0
17.0
26.0
38.5
1/3
11H
22H
9.0
17.5
26.5
37.7
1/3
19H
35H
13.0
27.0
40.0
25.0
1/3
3FH
3FH
32.0
32.0
64.0
15.6
1/2
7FH
7FH
64.0
64.0
128.0
7.8
1/2
FFH
FFH
128.0
128.0
256.0
3.9
1/2
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