部分如下data-sheet
Bits 10–9 T2TOADC. Start ADC by GP timer 2 event
00 = No event starts ADC
01 = Setting of underflow interrupt flag. Starts ADC
10 = Setting of period interrupt flag. Starts ADC
11 = Setting of compare interrupt flag. Starts ADC
程序代码如下：
LDP #e8h
LACC 0h ；对应GPTCON
OR #600h ；对应11 = Setting of compare interrupt flag. Starts ADC
AND 0f9ffh ；对应No event starts ADC
SACL 0h
问题：为何对同一寄存器GPTCON的Bits 10–9 （T2TOADC）设置两次不同的值？我觉得最后一次的值才有效，第一次设置的值被第二次的覆盖了。
