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MCP19116 Datasheet(PDF) 95 Page - Microchip Technology |
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MCP19116 Datasheet(HTML) 95 Page - Microchip Technology |
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95 / 246 page  2015-2016 Microchip Technology Inc. DS20005479B-page 95 MCP19116/7 13.0 OSCILLATOR MODES The MCP19116/7 devices have one oscillator configu- ration which is an 8 MHz internal oscillator. 13.1 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. 13.2 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 18.0 “Flash Program Memory Control” for the procedure on reading the program memory. 13.3 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 13-1). Note: The FCAL<6:0> bits in the CALWD6 register must be written into the OSCCAL register to calibrate the internal oscillator. REGISTER 13-1: 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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