參數(shù)資料
型號： UPD17207GF
廠商： NEC Corp.
英文描述： 4-BIT SINGLE-CHIP MICROCONTROLLER WITH LCD CONTROLLER/DRIVER AND A/D CONVERTER FOR INFRARED REMOTE CONTROL TRANSMITTERS
中文描述： 4位單片機與LCD控制器/驅(qū)動器和A / D轉(zhuǎn)換器紅外遙控遞質(zhì)
文件頁數(shù)： 40/120頁
文件大?。?/td> 516K
代理商： UPD17207GF
μ
PD17201A, 17207
40
Fig. 7-5 Input/Output Control Register for Port/Timer Output, LED Output, and Serial Interface
7.3.2
Setting a Carrier Frequency and a Duty Factor
Frequency division ratio necessary for obtaining carrier frequency f
C
can be calculated by the following expression
where the frequency of main clock (X) is f
X
.
= f
X
/(2 x f
C
).
Set the following values to the modulo register to divide into duty factors m: n.
High-level period setting value (NRZHTMM) = x m/(m + n) – 1
Low-level period setting value (NRZLTMM) = x n/(m + n) – 1
Example:
Where f
X
= 4 MHz, f
C
= 38 kHz, and duty factor = 1/3 (m:n = 1:2)
= 4 MHz/(2 x 38 kHz) ..
Therefore, the values of the modulo registers are as follows:
High-level period (NRZHTMM) ..
Low-level period (NRZLTMM) ..
Calculating the carrier frequency with these values,
f
C
= f
X
/(2 x ) = 4 MHz/(2 x 53) ..
(where = (17 + 1) + (34 + 1) = 53)
RF: address 23H
Bit 3
Bit 2
Bit 1
Bit 0
0
N
R
Z
E
N
T
M
O
E
S
I
O
E
N
R
R/W
R/W
R/W
0
0
0
0
Read/write
Initial value at reset
TMOE
Read = R, Write = W
0
Function
Uses P0D
1
as I/O port pin
1
Uses P0D
1
as external signal output pin of 8-bit timer
0
Function
1
NRZEN
Uses P0D
0
as I/O port pin
Uses P0D
0
as LED output pin
相關(guān)PDF資料
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