SH3100 Datasheet, PDF (44/80 Pages) Semtech Corporation – Supervisory IC with I2C Interface and PWM

SH3100
POWER MANAGEMENT
Register Descriptions (continued)
Address(hex): 49
Register Name WriteProtects
Bit 7
Bit 6
Bit 5
Bit No.
[4]
Description
XtalTrimWP
[2]
Calibration fuse WP
THIS REGISTER IS FUSE
INITIALIZED
[1]
App-specific fuse WP
THIS REGISTER IS FUSE
INITIALIZED
[0]
ResetThresholdWP
Description
(R/W) Write-protects.
Default Value: 0001 0000
Reset Event: P (bit 4)
Reset Event: P, W (bits 2:0)
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Xtal Trim WP
Cal Fuse WP
Bit Value Value Description
App-specific ResetThresh
Fuse WP
WP
0
The XtalTrim register can be written immediately after clearing
this bit, whereafter this flag reverts to 1
1
The XtalTrim register can not be written
0
The calibration fuses and registers can be changed
1
The calibration fuses and registers can not be changed
Calibration registers include:
Int32kCoarseTrim
Int32kFineTrim
BGCode
TempTrim
0
The application-specific fuses and registers can be changed
1
The application-specific fuses and registers can not be changed
Application-specific registers include:
CLK0PostScaler
CLK1PostScaler
SSEnable
SSConfig
FLLDivideRatio
XtalTrim
I2CSlaveAddr
DeviceMode
ResetDuration
DACLevel
DCOCode
CLK1En
CLK1Supply
InvertCLK1
CLK1 HF/LF
0
The ResetThreshold fuses and register can be changed
1
The ResetThreshold fuses and register can not be changed
© 2006 Semtech Corp.
44
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