MSP430F5437低功耗电流大小

我有个板子MSP430F5437的，用外部3.5V供电，程序只有

P1SEL = 0X00;
P2SEL = 0X00;
P3SEL = 0X00;
P4SEL = 0X00;
P5SEL = 0X00;
P6SEL = 0X00;
P7SEL = 0X00;
P8SEL = 0X00;
PJSEL = 0X00;
P1DIR = 0X00; P2DIR = 0x00;
P3DIR = 0x00;
P4DIR = 0X00;
P5DIR = 0X00;
P6DIR = 0x00;
P7DIR = 0X00;
P8DIR = 0X00;
PJDIR = 0x00;
P1REN = 0XFF;
P2REN = 0XFF;
P3REN = 0XFF;
P4REN = 0XFF;
P5REN = 0XFF;
P6REN = 0XFF;
P7REN = 0XFF;
P8REN = 0XFF;
P1OUT = 0X00;
P2OUT = 0x00;
P3OUT = 0x00;
P4OUT = 0X00;
P5OUT = 0X00;
P6OUT = 0x00;
P7OUT = 0X00;
P8OUT = 0X00;
PJOUT = 0x00;

__bis_SR_register(LPM4_bits);     // Enter LPM4, Enable interrupts

然后电流在400ua，

用仿真器MSP430-FET430UIF仿真时（依然是外部供电）大概是3ua,

请问这个是什么问题呢？我不接仿真器这个电流很大啊，功耗降不下去啊，急死了~~~

灰小子：

接仿真器时，有一部分电流是通过仿真器提供的