EM78808
8-bit Micro-controller
comparator is adjusted accordingly.
*The reference signal must be between Vss and Vdd.
*Threshold detector applications may be the same reference.
*The comparator can operate from the same or different reference source.
OP outputs
*The compared result is stored in the OPOUT through a Schmitt trigger.
Using as an operation amplifier
The comparator can be used as an operation amplifier, if a feedback resister is connected from the input to the
output externally.
Bit 4 (CMPIN1) : Switch for controlling PORT63 as IO PORT or a comparator input.
0 ꢂIO PORT63
1 ꢂcomparator input
Bit5 (CMPIN2) : Switch for controlling PORT64 as IO PORT or a comparator input.
0 ꢂIO PORT64
1 ꢂcomparator input
Bit 6 (CMPIN3) : Switch for controlling PORT65 as IO PORT or a comparator input.
0 ꢂIO PORT65
1 ꢂcomparator input
Bit 7 (CMPREF) : Switch for comparator reference voltage type
0 ꢂinternal reference voltage
1 ꢂexternal reference voltage
PAGE2 (Energy Detector)
7
6
5
4
3
2
1
0
VRSEL
DED
EDGE
WUEDD CW_SMB DEDCLK DEDPWR
DEDTHD
Bit 0 (DEDTHD) : The minimum detection threshold of Differential Energy Detector (DED)
0/1 ꢂ-45dBm/-35dBm
Bit 1 (DEDPWR) : Power control of Differential Energy Detector (DED)
0/1 ꢂPower off / Power on
Bit 2 (DEDCLK) : Operating clock for Differential Energy Detector (DED)
0/1 ꢂ32.768kHz/3.5826MHz
This bit is used to select operating clock for Differential Energy Detector (DED). When this bit is set to “1”,
the PLL is also enabled regardless of RA bit 6 (ENPLL) value. At this time, the Energy detector works at high
frequency mode. When this bit is set to “0”, the Energy Detector works at low frequency mode. The difference
between high frequency mode and low frequency is as follows.
DEDPWR
0
DEDCLK ENPLL
Energy detector CLK main CLK
X
X
X
Decision by
ENPLL
Disable
Enable
1
1
1
1
0
0
1
1
0
1
0
1
32.768 KHZ
32.768 KHZ
3.5826 MHZ
3.5826 MHZ
Disable
Enable
PS. “X” means don’t care
Bit 3(CW_SMB) : Call Waiting / short message receiver switch
0 ꢂShort message mode select. ± 5.5% CAS tone accepted frequency range deviation.(Protocol : ± 5%)
1 ꢂCall Waiting mode select. CAS tone accepted frequency range deviation is decided on CODE Option
Register bit 5 ( 1:for Europe and USA / 0:for China )
Bit 4 (WUEDD) : Wake-up control of Energy Detector (DED) output data
1/0 ꢂenable/disable
Bit 5 (EDGE) : Wake-up and interrupt trigging edge control of Energy Detector (DED) output
1/0 ꢂFalling edge trig. / Rising edge and Falling edge trig.
Bit 6 (DED) : Interrupt mask of DED output data
0 ꢂdisable interrupt of DED output data
______________________________________________________________________________________________________________________________________________________
* This specification is subject to change without notice.
8/1/2004 (V3.1)
42
ELAN [ ELAN MICROELECTRONICS CORP ]
