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| 型號(hào)： | HE84G770B |
| 廠商： | King Billion Electronics Co., Ltd. |
| 英文描述： | 8-BIT MICRO-CONTROLLER |
| 中文描述： | 8位微控制器 |
| 文件頁數(shù)： | 47/61頁 |
| 文件大?。?/td> | 817K |
| 代理商： | HE84G770B |
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20.
Infrared output
King Billion Electronics Co., Ltd
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億
電
子
股
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公
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HE84G770
HE80004H SERIES
October 31, 2003
This specification is subject to change without notice. Please contact sales person for the latest version before use.
47
Version:V1.1
To achieve an IR output with programmable frequency and duty cycle, two 7-bit registers are employed
here. The IRH register represents the period (on FCK clock number) of output high, while IRL register
represents the period of output low. With this mechanism, the output IR frequency is equal to
FCK/(IRH+IRL), and the high duty cycle ratio is equal to IRH/(IRH+IRL). To make the IRO as output
pin alone, either IRH or IRL can be set as 0. When IRH is 0, the IRO output is a DC low. On the contrary,
if IRL is 0, the output is a DC high. Special care in hardware implementation is also taken according to
the MO_IRO (mask option to determine the default state of the IRO) to avoid glitch when PWM output is
disabled.
MUX
1
0
IRH
IRL
IRO
IRO
Counter
7-bit
CK
R
D
Q
Fck
Counter+1
Compare
IR
generator
reset
Toggle signal
M
I
I
IRO
To avoid unexpected IR output, users should firstly load the content of IRH and IRL before turn on IR by
set IROE bits to ‘1’.
The access of all the registers of IR is through the extension register. They are list as below:
Extension register
Address Name Bit7
0x15h
0x16h
IROE: ‘0’
IR is disabled (default); ‘1’
IR is enabled.
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0 Mode Reset value
R/W
W
IRL
IRH
IROE
-
IR PWM LOW DURATION
IR PWM HIGH DURATION
0xxx xxxx
-xxx xxxx
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