參數(shù)資料
型號(hào)： EM78P568
廠商： ELAN Microelctronics Corp .
英文描述： 8-BIT OTP MICRO-CONTROLLER
中文描述： 8位檢察官微控制器
文件頁(yè)數(shù)： 55/61頁(yè)
文件大?。?/td> 568K
代理商： EM78P568
EM78P568
8-bit OTP Micro-controller
__________________________________________________________________________________________________________________________________________________________________
* This specification are subject to be changed without notice.
01/31/2004 V4.7
VII.13 Programming tone generators
N-R
resistor
string
Tone 1
analog
multiplexer
Tone 2
analog
multiplexer
Tone 2
programmable counter
Tone 1
programmable counter
TONE
Buffer
Buffer
Mixer
(output inverse)
fi
fs2
T2Mux
control
T1Mux
control
fs1
Vref2
Vref2
Vref2
Reference
voltage
Vref1
Vref1
Vref2
VT
fs1 = fi / N1, fs2 = fi / N2
N2
N1
fT1 = fi / N1 / N, tone1 output frequency
fT2 = fi / N2 / N, tone2 output frequency
T27 ~ T20
T1A ~ T10
Name
T1A ~ T18 IOCE PAGE0 bit 2 ~ 0
T17 ~ T10
IOCD PAGE0 bit 7 ~ 0
T27 ~ T20
IOCA PAGE0 bit 7 ~ 0
Register bit location
Fig.23 Programming tone generator
Programming tone generators is an universal dual tone generators. It includes Tone 1 and Tone 2 generators which
can be combines as dual tones output or either one tone output. The clock source fi is come from PLL and divided
to required ratio. Tone 1 and Tone 2 are sinewave output. The programming tone generators consists of Tone 1/2
programmable counters, analog multiplexer, N-R resistor string, output buffers, mixer amplifier and reference
voltage. N-R resistor is a voltage divider which has different output levels. By programmable counters and analog
multiplexer, the hardware will automatically generate individual divider output with circular order back and forth.
The output frequency will be 119957/N1 for Tone 1 and 11.957/N2 for Tone 2, where N1 is 11-bit T1A ~ T10 and
N2 is 8-bit T17 ~ T10.
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