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| 型號： | EM78P468NH |
| 廠商： | ELAN Microelctronics Corp . |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8-BIT MICROCONTROLLER |
| 中文描述： | 8位微控制器 |
| 文件頁數(shù)： | 50/82頁 |
| 文件大小： | 1491K |
| 代理商： | EM78P468NH |
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EM78P468N
8-BIT Microcontroller
4.10
Generate
46
Product Specification (V1.2) 03.15.2005
(This specification is subject to change without further notice)
nfrared Remote Control Application / PWM Waveform
This LSI can output infrared carrier in a friendly manner or in PWM standard waveform.
The IR and PWM waveform generated functions include an 8-bit down count
timer/counter, high-pulse width timer, low-pulse width timer, and IR control register. The
IR system block diagram is show in Fig.21, The IROUT pin waveform is determined by IR
control register (RE), IOC90 (Counter 1, 2 control register), IOCA0 (high-pulse width
timer, low-pu
(high-pulse
register). Details on Fcarrier, high ulse time, and low pulse time are explained as
follows
:
unter 2 preset), IOCD0
w-pulse width timer preset
If Counter 2
IOC91);
lse width timer control register), IOCC0 (Co
width timer preset register), and IOCE0 (lo
-p
source clock is F (this clock source can set by
prescaler
*
))
0
IOCC
(
value
preset
2
counter
of
decimal
+
1
*
2
F
=
F
T
carrier
If high-pulse width timer source clock is FT (this clock source can set by IOCA1);
T
time
pulse
high
T
F
))
0
IOCD
(
value
timer
width
pulse
high
of
decimal
+
1
*
prescaler
=
If low-pulse width timer source clock is FT (this clock source can set by IOCA1);
T
F
time
pulse
low
T
))
0
IOCE
(
value
timer
width
pulse
low
of
decimal
+
1
*
prescaler
=
H/W Modulator Circuit
Pre-scaler
(IOC91)
8 bit dow n counter
Fs
8 bit dow n counter
Pre-scaler
(IOC A1)
8
Auto-reload buffer
Auto-reload buffer
8
8
8 bit dow n counter
8
Auto-reload buffer
8
IROUT pin
Pre-scaler
(IOCA1)
IRE
Fcarrier
Fm
LGP
High-Pulse Width Timer
(IOCD0)
Low -Pul
( I
se Width Timer
OCE0)
HF
Counter 2
(IOCC0)
8
RE egister
8
8
Fm:
main oscillator frequency
;
Fs:
sub-o cillator frequency
. 21 IR/PWM System Block Diagram
Fig
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