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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 53/61頁 |
| 文件大小： | 568K |
| 代理商： | EM78P568 |
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EM78P568
8-bit OTP Micro-controller
__________________________________________________________________________________________________________________________________________________________________
* This specification are subject to be changed without notice.
01/31/2004 V4.7
VII.11 8-bit R-2R DAC
DAST/P67
PORT67
DAO/P67
DATEN
MUX
2.5V
ref
VDD
REFSEL
REFEN
B2
B1
2R
2R
R
2R
2R
R
8-bit
DAC
input
data
buffer
(This circuit is from Comparator)
VRSEL
To ladder resistors
CMPEN
(This circuit is from CTCSS)
MUX
ASW3
VTX3
VRX3
To Sub-Audio LPF
MUX
DAC input
MUX
DA7~DA0
DAT/DAD
(part of DAC Tone Gen.)
DAC tone gen
Name
DA7 ~ DA0
DAT/DAD
Register bit location
RA PAGE1 bit 7 ~ 0
IOCA PAGE1 bit 7
Name
DAST/P67
DATEN
Register bit location
IOCA PAGE1 bit 3
IOCA PAGE1 bit 5
ps. Please refer to “Voltage reference control logic” to set DAC reference.
Fig.22 DAC block
In DAC tone generator mode, user can get CTCSS tone output. In other case, DAC is useful in general tone
generation such as key tone, alert tone, music and so on. In DAC general mode, only VREF and DAST/P67 bits are
relative to DAC reference voltage. DAC reference voltage is come from VDD or 2.5V ref. Setting VREF bit (IOCE
PAGE1 bit 6) = 0/1 to select VDD/2.5V as reference. Setting DAST/P67 bit = 1 to power on DAC and also enable
output buffer B1. After that, DAC output signal will be sent to DAO/P67 pin.
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