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SLG46824 Datasheet(PDF) 80 Page - Dialog Semiconductor

Part No. SLG46824
Description  GreenPAK Programmable Mixed Signal Matrix with In System
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Maker  DIALOG [Dialog Semiconductor]
Homepage  http://www.dialog-semiconductor.com/
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SLG46824 Datasheet(HTML) 80 Page - Dialog Semiconductor

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Datasheet
31-Jan-2018
CFR0011-120-01
Revision 2.3
80 of 152
© 2018 Dialog Semiconductor
SLG46824
GreenPAK Programmable Mixed Signal Matrix with In System
Programmability
PRELIMINARY
13
Clocking
13.1 OSC GENERAL DESCRIPTION
The SLG46824 has three internal oscillators to support a variety of applications:
Oscillator0 (2.048 kHz)
Oscillator1 (2.048 MHz)
Oscillator2 (25 MHz).
There are two divider stages for each oscillator that gives the user flexibility for introducing clock signals to connection matrix, as
well as various other Macrocells. The predivider (first stage) for Oscillator allows the selection of /1, /2, /4 or /8 to divide down
frequency from the fundamental. The second stage divider has an input of frequency from the predivider, and outputs one of eight
different frequencies divided by /1, /2, /3, /4, /8, /12, /24 or /64 on Connection Matrix Input lines <27>, <28> and <29>. Please
see Figure 56, for more details on the SLG46824 clock scheme.
Oscillator2 (25 MHz) has an additional function of 100 ns delayed startup, which can be enabled/disabled by reg <1052>. This
function is recommended to use when analog blocks are used along with the Oscillator.
The Matrix Power Down/Force On function allows switching off or force on the oscillator using an external pin. The Matrix Power
Down/Force On (Connection Matrix Output <72>, <73>, <74>) signal has the highest priority. The OSC operates according to the
following table:
Table 46: Oscillator Operation Mode Configuration Settings
POR
External Clock
Selection
Signal From
Connection
Matrix
Register:
Power Down or
Force On by
Matrix Input
Register: Auto
Power On or
Force On
OSC Enable
Signal from
CNT/DLY
Macrocells
OSC
Operation
Mode
0
XXX
XX
OFF
11
X
X
X
X
Internal OSC is
OFF, logic is ON
101
0
X
X
OFF
101
1
X
X
ON
100
X
1
X
ON
100
X
0
CNT/DLY re-
quires OSC
ON
100
X
0
CNT/DLY does
not require OSC
OFF
Note 7: The OSC will run only when any macrocell that uses OSC is powered on.


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