SH3100 Datasheet, PDF (42/80 Pages) Semtech Corporation – Supervisory IC with I2C Interface and PWM

SH3100
POWER MANAGEMENT
Register Descriptions (continued)
Address(hex): 44
Register Name DCOCode
Bit 7
Bit 6
Bit 5
Bit No.
[5:0]
Description
DCOCode[18:13]
THIS REGISTER IS FUSE
INITIALIZED
Address(hex): 45
Register Name DCOCode
Bit 7
Bit 6
Bit 5
Bit No.
[5:0]
Description
DCOCode[12:7]
THIS REGISTER IS FUSE
INITIALIZED
Description
Bit 4
Bit Value
(R/W) Sets the default HFDCO
code for a free-running (non
FLL Locked) HFDCO.
Default Value: 0000 0000
Reset Event: P, W, B
Bit 3
Bit 2
Bit 1
Bit 0
DCOCode[18:13]
Value Description
The 19-bit DCOCode defines the code and hence frequency at
which the High Frequency Digitally Controlled Oscillator (HFDCO)
starts, thereby determining its initial frequency prior to the FLL
locking it to the 32.768 kHz source. Due to the nature of the
HFDCO, the exact frequency for any one device can not be
deducted from the DCOCode, but can be read back after FLL
locking with the CoarseLock feature in the FLLConfig register,
and thereafter programmed into the fuses to ensure that the
starting frequency is very close to the target frequency
This register is set up so that CLK0 is as close as possible to the
target frequency before FLL locking
Most customers need not access this register, but it can be
used in cases where the standard SH3100 frequency (TBD) is
not suitable for the system
Note that this register may not be changed if the
App-specificFuseWP bit in the WriteProtects register is set
Description
Bit 4
Bit Value
(R/W) Sets the default HFDCO
code for a free-running (non
FLL Locked) HFDCO.
Default Value: 0000 0000
Reset Event: P, W, B
Bit 3
Bit 2
Bit 1
Bit 0
DCOCode[12:7]
Value Description
See description for register 44
Note that this register may not be changed if the
App-specificFuseWP bit in the WriteProtects register is set
© 2006 Semtech Corp.
42
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