还是有一些改动的，以前收到过一封邮件，源头是从ST Automotive部门发出的，信的内容详细介绍了ST72F321与ST7FAudio的区别，信的主要内容如下：
ST7Faudio question VS ST72F321AR9TAE
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1. remove AVD
2. remove LVD low and medium threshold
3. remove internal and external RC
4. remove PLL - for 8MHz internal, a 16 MHz quartz and divider by two will be necessary.
5. remove LP and MP osc range
6. remove HW watchdog option
7. remove HALT mode
8. remove option bit WDGHALT
9. no CSS
10.remove 256 cycle option (also with ceramic resonator you can use the 4096 cycles)
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