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SH79F6489P/080PR Datasheet(PDF) 37 Page - SINOWEALTH Electronic Ltd

No. de pieza SH79F6489P/080PR
Descripción Electrónicos  Enhanced 8051 Microcontroller with 20bit Σ-ΔADC and LCD Driver
PDF  152 Pages
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Fabricante Electrónico  SINOWEALTH [SINOWEALTH Electronic Ltd]
Página de inicio  https://en.sinowealth.com
Logo SINOWEALTH - SINOWEALTH Electronic Ltd

SH79F6489P/080PR Datasheet(HTML) 37 Page - SINOWEALTH Electronic Ltd

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SH79F6488/SH79F6489
37
7.5.5 System Clock Select
1. If code option OP_OSC is 0000, Below for two clocks to be selected.
OSC1: internal 12MHzRC
OSC2: 48MHz PLLCLK 1/2 prescaler
OSC1:
12MHz RC
OSC2:
PLL CLK : 24M
1
2
① When OSCSCLK changed from OSC1 to PLL, the steps below must be done in sequence:
a. Set OSC2ON = 1
b. Set PLLON = 1 to turn on the 48MHz PLL
c. Wait at least 2ms
d. Set PLLFS=1 to select PLL as OSC2CLK
e.Set FS = 1 to select PLL as OSCSCLK
②When OSCSCLK changed from PLL to OSC1, the steps below must be done in sequence:
a. Set FS = 0 to select 12MHz RC as OSCSCLK
b. Set PLLON = 0 to turn off PLL, reduce the power consumption of the system
2. If code option OP_OSC is 1010 or 1101, Below for three clocks to be selected.
OSC1:32.768kHz oscillator from XTAL
OSC2: high frequncy oscillator from XTALX or internal 12MHzRC
PLLCLK:48MHz PLLCLK 1/2 prescaler
OSC1:
32.768kHz Crystal
OSC2:
12MHz RC or
400kHz~16MHz Crystal
PLL CLK :
24M
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