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| 型號： | HE84761 |
| 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)： | 26/30頁 |
| 文件大小： | 456K |
| 代理商： | HE84761 |
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King Billion Electronics Co., Ltd
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億
電
子
股
份
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公
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HE84761
HE80000 SERIES
continuous phase. This feature is useful for generating phase coherent FSK (Frequency Shift Keying) tone
August 15, 2003
This specification is subject to change without notice. Please contact sales person for the latest version before use.
Page 26 of 30
V1.2
as often used in Telecommunication.
The frequency range is further expanded to 4095 Hz to cover the more range. For example, the Caller
Alerting Tone requires 2130 and 2750 Hz tones to be generated which is beyond the range of the original
design.
Bit3 Bit2
0
0
1
1
Channel select
0 Row + Column
1 Row frequency
0 Column frequency.
1
x
In addition to DTMF generation function, this function block also provides others features which are
useful for the phone application. For example, Bit 4 (KT bit) of command register controls the generation
of 1024 Hz square wave to provide the audio feedback to the user in response to key presses. When KT
bit is ‘1’, square wave generation is enabled, and when KT bit ‘0’, the square wave is disabled. The
DTMF and Keytone outputs are not dedicated output pins, but are multiplexed with I/O PRT10[0] and
PRT10[1]. The functions of these two pins are determined by mask options MO_TONE and
MO_KEYTONE.
Mask Option
MO_TONE
MO_KEYTONE
Value Function
0
Normal I/O pin (PRT10[0])
1
TONEO output through prt10[0]
0
Normal I/O pin (PRT10[1])
1
KEYTONE output through prt10[1]
18.
Absolute Maximum Rating
Item
Sym.
V
DD
V
LVL5
V
IN
V
O
T
OP
T
ST
Rating
-0.5V ~ 4.0V
< 8.5 V
-0.5V ~ V
DD
+0.5V
-0.5V ~ V
DD
+0.5V
0
°
C ~ 70
°
C
-50
°
C ~ 100
°
C
Condition
Supply Voltage
LCD Operating Voltage
Input Voltage
Output Voltage
Operating Temperature
Storage Temperature
19.
Recommended Operating Conditions
Item
Sym.
V
DD
V
IH
V
IL
Rating
2.4V ~ 3.6V
0.9 V
DD
~ V
DD
0.0V ~ 0.1V
DD
8 MHz
Condition
V
DD
=3.0V
Supply Voltage
Input Voltage
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