S3C2450的PWR_EN电平怎么回事？

sunqiyan99168

S3C2450的PWR_EN电平怎么回事？ [复制链接]

According to the datasheet of S3C2451, the CPU can be in SLEEP MODE after we set PWRMODE register to 0x2BED, I added the command "rPWRMODE=0x2BED" in my program. When I run this program, the sentences after this command were not executed at all, i think the CPU was in SLEEP mode. Datasheet shows that the voltage of PWR_EN should be low while CPU is in SLEEP mode,but I discovered that the voltage of PWR_EN was always high.I don't know why.I don't know whether the sequence of entering SLEEP mode was finished completely.
Is there anyone who can do me a favor?

hc1990

怎么没人回复呢？

wvp333

英文的咋看啊！！

yoyo1985914

你可以把PWR_EN人为拉低（直接接地或者通过一个小电阻接地），看看你程序添加的rPWRMODE=0x2BED能否执行？
你在仔细看看进入SLEEP MODE还需要设置哪些寄存器。

nfwo

引用 3 楼 llkk0616 的回复:
你可以把PWR_EN人为拉低（直接接地或者通过一个小电阻接地），看看你程序添加的rPWRMODE=0x2BED能否执行？
你在仔细看看进入SLEEP MODE还需要设置哪些寄存器。

S3C2450的datasheet说PWR_EN引脚是一个输出引脚，在SLEEP状态下是low，otherwise high。 rPWRMODE=0x2BED后面的语句没有执行，说明rPWRMODE=0x2BED执行了，如果没有rPWRMODE=0x2BED，后面的语句会执行的，我做过实验。联系samsung也没有回音！哎，真没招了，专家帮帮忙！

lianshi007

没人有想法吗？

zhaohuaipu

你可以把PWR_EN人为拉低，看是不是硬件问题。