I have some questions about mcf52211's clock module,hope you can geive me some explanations
1. the CLKMOD[1:0] Pins determine clock mode during POR, The 52211 reference manual says:
CLKMOD[1:0] XTAL Clocking Mode
00 0 PLL disabled, clock driven by external oscillator
00 1 PLL disabled, clock driven by on-chip oscillator
01 N/A PLL disabled, clock driven by external crystal
10 0 PLL in normal mode, clock driven by external oscillator
10 1 PLL in normal mode, clock driven by on-chip oscillator
11 N/A PLL in normal mode, clock driven by external crystal
my question is if I use MCF52211CAE66 (LQFP64 package), which has not CLKMOD1 pin, how about the clock mode during POR? for example if I connect CLKMOD0 pin to VCC33, what is the clock mode ?
2.The CCLR register select clock source, reference manual's table 6-11 says:
Table 6-11. CCLR[OSCSEL1] and CCLR[OSCSEL0] Settings
OSCSEL1 OSCSEL0 Source of PLL input/bypass clock
0 0 Primary oscillator (default)
0 1 Relaxation oscillator
my question is what is Primary oscillator and what is secondary oscillator?