參數(shù)資料
型號(hào)： HT95A20P
廠商： Holtek Semiconductor Inc.
英文描述： 8-Bit LCD Type Phone Controller MCU
中文描述： 8位LCD型電話MCU控制器
文件頁(yè)數(shù)： 18/42頁(yè)
文件大小： 768K
代理商： HT95A20P
HT95L100/10P
Rev. 0.10
18
October 1, 2002
Preliminary
Register
Label
Bits
R/W
Function
LCDIO
(28H)
0~4
6~7
RO
Unused bit, read as 0
SPE0
5
RW
0: SEG16~ SEG19 pins are LCD segment output
1: SEG16~ SEG19 pins are PE0~PE3 pins
DTMF generator
The DTMF (Dual Tone Multiple-Frequency) signal gen-
erator is implemented in the telephone controller. It can
generate 16 dual tones and 8 single tones from the
DTMF pin. This generators also support power down,
tone on/off function. The DTMF generator clock source
is 3.58MHz, before using this function, the system oper-
ation mode must be at Normal mode.
The power down mode (D_PWDN=1) will terminate all
the DTMF generator function, however, the registers
DTMFC and DTMFD are accessible at this power down
mode.
The duration of DTMF output should be handled by the
software. DTMFD register value could be changed as
desired, the DTMF pin will output the new dual-tone si-
multaneously.
Register
Label
Bits
R/W
Function
DTMFC
(20H)
D_PWDN
0
RW
DTMF generator power down
1: DTMF generator is at power down mode.
0: DTMF generator is at operation mode.
1
RO
Unused bit, read as 0
TONE
2
RW
Tone output enable
1: DTMF signal output is enabled.
0: DTMF signal output is disabled.
7~3
RO
Unused bit, read as 0
DTMFD
(21H)
TC4~TC1
3~0
RW
To set high group frequency
TR4~TR1
7~4
RW
To set low group frequency
The DTMF pin output is controlled by the combination of the D_PWDN, TONE, TR~TC value.
Control Register Bits
DTMF Pin Output Status
D_PWDN
TONE
TR4~TR1/TC4~TC1
1
x
x
0
0
0
x
1/2 VDD
0
1
0
1/2 VDD
0
1
Any valid value
16 dual tones or 8 signal tones, bias with 1/2 VDD
6 $ " ;
7 D
4 4 "
"
" ! "
"
7 D
"
"
7 D % "
"
" A
"
! /
7 D %
7 D
7 D %
7 D
7 D %
E
3
D %
E
3
D
DTMF output
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