msp430x24x_hfxt2.s43

来自「步进电机驱动程序msp430f247单片机」· S43 代码 · 共 15 行

;*******************************************************************************
;   MSP430x24x Demo - Basic Clock, MCLK Sourced from HF XTAL
;
;   Description: Proper selection of an external HF XTAL for MCLK is shown by
;   first polling the OSC fault until XTAL is stable - only then is MCLK
;   sourced by LFXT1. MCLK/10 is on P1.1 driven by a software loop taking
;   exactly 10 CPU cycles.
;   ACLK = MCLK = LFXT1 = HF XTAL, SMCLK = default DCO ~1.025MHz
;   //* HF XTAL NOT INSTALLED ON FET *//
;   //* Min Vcc required varies with MCLK frequency - refer to datasheet *//
;
;                MSP430F249
;             -----------------
;         /|\|              XIN|-
;          | |                 | HF XTAL (3