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EM6812F2TP24B Datasheet(PDF) 24 Page - EM Microelectronic - MARIN SA |
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EM6812F2TP24B Datasheet(HTML) 24 Page - EM Microelectronic - MARIN SA |
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24 / 81 page  R EM6812 Copyright © 2005, EM Microelectronic-Marin SA 24 www.emmicroelectronic.com 8.2 High frequency clock source 8.2.1 RC oscillator The RC oscillator is the main clock generator of the high frequency domain. Its function is based on internal elements only. An 8-bit trim register is provided to allow precise frequency adjustment based on known timing functions (software Frequency Locked Loop FLL). The RC Osc is switched on by default on system startup and after any reset on its base frequency of 1MHz. The Pre-Divider is set to /8 which results in a CPU and peripheral clock frequency of 125KHz (typ). • Frequency range: 1MHz or 10MHz. Selectable with bit FreqRange in register RegSys1. • Frequency division by 1, 2, 4 or 8. Selectable with bits RCDiv[1:0] in register RegSys2. • RC trimming: Range ± ~40%. Coded on 8 bits Trim[7:0] in register RegTrimRC. Figure 16. Overlapping RC Oscillator trimming regions (75kHz to 14MHz) The user may generate almost any frequency from typ. ~75kHz up to ~14MHz continuously with the 3 combinations mentioned above. The F2 clock mainly depends on the selected frequency range, divider setting and trimm value. Table 18. Clock selection after Pre-Division (signal F2 in Figure 15) RC oscillator @ 1 MHz FreqRange = 0 in RegSys1 RC oscillator @ 10 MHz FreqRange = 1 in RegSys1 Divide by 8 Divide by 4 Divide by 2 Divide by 1 Divide by 8 Divide by 4 Divide by 2 Divide by 1 RCDiv[1:0] 11 RCDiv[1:0] 10 RCDiv[1:0] 01 RCDiv[1:0] 00 RCDiv[1:0] 11 RCDiv[1:0] 10 RCDiv[1:0] 01 RCDiv[1:0] 00 RC trimming: minimum frequency Trim[7:0] = 00 75kHz 150kHz 300kHz 0.6MHz 0.75MHz 1.5MHz 3MHz 6MHz RC trimming: nominal frequency Trim[7:0] = 7F (default) 125 kHz 250kHz 500kHz 1MHz 1.25MHz 2.5MHz 5MHz 10MHz RC trimming: maximum frequency Trim[7:0] = FF 175kHz 350kHz 700kHz 1.4MHz 1.75MHz 3.5MHz 7MHz 14MHz Typ 1MHz Frequency after Pre-Division /2 /1 /4 /8 Typ -40% Typ +40% Typ 500kHz Typ 250kHz Typ 125kHz Min. 75kHz(RC=1MHz) Max. 1.4MHz(RC=1Mhz) RC 1MHz Frequency after Pre-Division /2 /1 /4 /8 Typ 10MHz Typ -40% Typ +40% Typ 5MHz Typ 2.5MHz Typ 1.25MHz Min 750kHz(RC=10MHz) Max. 14MHz(RC=10Mhz) RC 10MHz |
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