?2011 Microchip Technology Inc.
DS22275A-page 31
RE46C180
bit 29
TMTR3: 3SB 
bit 28
TMTR2: 2SB 
bit 27
TMTR1: LSB 
bit 26
HYTR3: MSB (See Table 4-3)
bit 25
HYTR2: 2SB 
bit 24
HYTR1: LSB 
bit 23
STTR5: MSB (See Table 4-2)
bit 22
STTR4: 4SB 
bit 21
STTR3: 3SB 
bit 20
STTR2: 2SB 
bit 19
STTR1: LSB 
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
bit 11
LBHshEn: Low Battery Hush Enable Bit 
1 =  Enable
0 =  Disable
bit 10
AMHCEn: Alarm Memory PTT Indicator Horn Chirp Enable Bit 
1 =  Enable
0 =  Disable
bit 9
AMLEDEn: Alarm Memory PTT Indicator LED Flashing Enable Bit
1 =  Enable
0 =  Disable
bit 8
AMTO2: MSB 
bit 7
AMTO1: LSB 
00 = 24 Hours Timeout
01 =  48 Hours Timeout
10 =  0 Hours Timeout
11 =  Never Timeout
bit 6
AMEn: Alarm Memory Enable Bit 
1 =  Enable
0 =  Disable
REGISTER 4-3:
SERIAL READ/WRITE REGISTER (CONTINUED)
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