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PC87372 Datasheet(PDF) 43 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # PC87372
Description  LPC SuperI/O with Glue Functions
PDF  144 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

PC87372 Datasheet(HTML) 43 Page - National Semiconductor (TI)

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3.0 Device Architecture and Configuration (Continued)
43
www.national.com
Revision 1.2
3.7.6
Clock Generator Control Register (CLOCKCF)
Power Well: VSB3
Location:
Index 29h
Type:
Varies per bit
Bit
76
5
43210
Name
HFCGEN
Reserved
CKVALID
Reserved
Reset
0
0
0
00000
Bit
Type
Description
7
R/W1S HFCGEN (Clock Generator Enable). When set to 1, this bit enables the operation of the Clock
Generator, and locks the configuration register CLOCKCF by disabling writing to all its bits (including to
the HFCGEN bit itself). Once set, this bit can be cleared by VDD3 Power-Up reset (or Hardware reset).
0: Clock Generator disabled; the R/W bits are enabled for write (default).
1: Clock Generator enabled; all the bits are RO.
6-5
−
Reserved.
4RO
CKVALID (Valid Clock Generator, Clock Status). This bit indicates the status of the on-chip, 48 MHz
Clock Generator and controls the generator output clock signal. The PC87372 modules using this clock
may be enabled (see Section 3.3.1 on page 36) only after this bit is read high (generator clock is valid).
0: Generator output clock frozen (default)
1: Generator output clock active (stable and toggling)
3-0
−
Reserved.



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