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MCP19124 Datasheet(PDF) 105 Page - Microchip Technology

Part # MCP19124
Description  Digitally-Enhanced Power Analog Synchronous Low-Side Dual-Loop PWM Controller
PDF  236 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP19124 Datasheet(HTML) 105 Page - Microchip Technology

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 2016 Microchip Technology Inc.
DS20005619A-page 105
MCP19124/5
16.0 OSCILLATOR MODES
The MCP19124/5 have one oscillator configuration,
which is an 8 MHz internal oscillator.
16.1
Internal Oscillator (INTOSC)
The Internal Oscillator module provides a system
clock source of 8 MHz. The frequency of the internal
oscillator can be trimmed with a calibration value in the
OSCTUNE register.
16.2
Oscillator Calibration
The 8 MHz internal oscillator is factory-calibrated. The
factory calibration values reside in the read-only
CALWD6 register. These values must be read from the
CALWD6 register and stored in the OSCCAL register.
Refer to Section 20.0 “Flash Program Memory
Control” for the procedure on reading the program
memory.
16.3
Frequency Tuning in User Mode
In addition to the factory calibration, the base
frequency can be tuned in the user's application. This
frequency tuning capability allows the user to deviate
from the factory-calibrated frequency. The user can
tune the frequency by writing to the OSCTUNE
register (refer to Register 16-1).
Note:
The FCAL<6:0> bits in the CALWD6
register must be written into the OSCCAL
register to calibrate the internal oscillator.
REGISTER 16-1:
OSCTUNE: OSCILLATOR TUNING REGISTER
U-0
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
—
TUN4
TUN3
TUN2
TUN1
TUN0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 7-5
Unimplemented: Read as ‘0’
bit 4-0
TUN<4:0>: Frequency Tuning bits
01111
= Maximum frequency
01110
= Maximum frequency
•
•
•
00001
=
00000
= Center frequency. Oscillator Module is running at the calibrated frequency.
11111
=
•
•
•
10000
= Minimum frequency



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