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?2011 Microchip Technology Inc.
DS22275A-page 25
RE46C180
4.4
User Feature Selections
User feature selections can be clocked in serially using
TEST as data input, and FEED, as a clock input, then
stored in the internal EEPROM.
The detailed steps are as follows:
1.    Power up with the bias condition shown in
Figure 4-1. At power-up: 
TEST = IO = FEED = T2 = V
SS
,
DETECT = V
DD
. Now in mode M0.
2.    Drive T2 input from V
SS
 to V
DD
 and hold at V
DD
to enter TM0.
3.   Drive TEST from V
SS
 to V
DD
 and hold at V
DD
.
4.   Apply two clock pulses to the T2 input (V
DD
 to
V
SS
 and then back to V
DD
) to enter in TM2.
5.   Using TEST as data and FEED as clock, shift in
values of 18 bits as selected from Register 4-2.
6.   After shifting in data, pull IO input to V
DD
, then
V
SS
  (minimum pulse-width of 10 ms) to store
shift register contents in the memory.
7.   If any changes are required, power down the
part and return to Step 1. All bit values must be
reentered.
 
REGISTER 4-2:
USER FEATURE CONFIGURATION REGISTER
U
W-x

LBTR2
bit 18
bit 17
W-x
W-x
W-x
W-x
W-x
W-x
W-x
W-x
LBTR1
EOLEn
COEn
NoAAL
SyncEn
LBHshEn
AMHCEn
AMLEDEn
bit 16
bit 8
W-x
W-x
W-x
W-x
W-x
W-x
W-x
W-x
AMTO2
AMTO1
AMEn
ShrTO
SmrtH
HIAO
HushEnB
TSEL
bit 8
bit 1
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as 0
-n = Value at POR
1 = Bit is set
0 = Bit is cleared
x = Bit is unknown
bit 18
Unimplemented: Read as x
bit 17
LBTR2: MSB
bit 16
LBTR1: LSB
00 = 7.5V
01 = 7.8V
10 = 6.9V
11 = 7.2V
bit 15
EOLEn: End-of-Life Indicator Enable Bit
1 =  Enable
0 =  Disable
bit 14
COEn: CO Alarm Function (Smart IO) Enable Bit
1 =  Enable
0 =  Disable
bit 13
NoAAL: Auto Alarm Locate Disable Bit
1 =  AAL is Disabled
0 =  AAL is Enabled
bit 12
SyncEn: Horn Synchronization Enable Bit
1 =  Enable
0 =  Disable
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