主要内容简介
影响功耗的主要因素
电源系统
时钟管理
运行模式和低功耗模式
运行模式
等待模式
活跃停机模式
停机模式
功耗与唤醒事件的测量与结果
功耗管理要点
要点摘要
停机模式(Halt):此模式下单片机的功耗最低,振荡器,CPU和外设的时钟都被关闭,主电压调压器断电。可用复位或外部中断唤醒,唤醒后之前运行的寄存器数据等都保持不变,且从HALT处继续执行程序。
停机模式下的功耗测量结果(MVR关LPVR开):12
运行模式下的功耗测量结果(从RAM运行,不是从Flash开始):12
停机模式下的唤醒时间测量结果:12
测试程序
/*
Function: 电源管理:停机(Halt)模式测试,没有进入停机模式前,四个LED
灯是每隔1秒钟亮灭一次的,超过10秒后,自动进入停机mode,
然后可以通过外部中断来唤醒停机,此时程序从停机位置
处继续往下运行。
Date : 2015年7月21日
Note : STVD + COSMIC
Author : yicm
Version : 0.0.9
*/
#include
/*Output Pin*/
_Bool PA3 @PA_ODR:3;
_Bool PC4 @PC_ODR:4;
_Bool PC5 @PC_ODR:5;
_Bool PC6 @PC_ODR:6;
_Bool PC7 @PC_ODR:7;
/*Input Pin*/
_Bool PC3 @PC_IDR:3;
/*电量指示灯*/
#define LED1 PA3
#define LED2 PC5
#define LED3 PC6
#define LED4 PC7
/*按键指示灯*/
#define LED5 PC4
#define KEY PC3
/*主时钟频率为8Mhz*/
void Init_CLK(void)
{
CLK_ICKR |= 0X01;
CLK_CKDIVR = 0x08;
while(!(CLK_ICKR&0x02));
CLK_SWR=0xE1;
}
void Init_GPIO(void)
{
/*LED 配置为推挽输出*/
PA_DDR |= 0X08; //PA3
PA_CR1 |= 0X08;
PA_CR2 &= 0XF7;
/*PC4 -KEY LED*/
PC_DDR |= 0X10;
PC_CR1 |= 0X10;
PC_CR2 &= 0XEF;
PC_DDR |= 0XE0; //PC5/6/7
PC_CR1 |= 0XE0;
PC_CR2 &= 0X1F;
LED1 = 1;LED2 = 1;LED3 = 1;LED4 = 1;LED5 = 1;
}
void Init_TIM1(void)
{
TIM1_IER = 0x00;
TIM1_CR1 = 0x00;
TIM1_EGR |= 0x01;
TIM1_PSCRH = 199/256; // 8M系统时钟经预分频f=fck/(PSCR+1) TIM1 为16位分频器
TIM1_PSCRL = 199%256; // PSCR=0x1F3F,f=8M/(0x1F3F+1)=1000Hz,每个计数周期1ms
TIM1_CNTRH = 0x00;
TIM1_CNTRL = 0x00;
TIM1_ARRH = 400/256; // 自动重载寄存器ARR=0x01F4=500
TIM1_ARRL = 400%256; // 每记数500次产生一次中断,即500ms
TIM1_CR1 |= 0x81;
TIM1_IER |= 0x01;
}
/*PC3设置为上拉输入*/
void Init_EXTI2_GPIO(void)
{
PC_DDR &= 0XF7;
PC_CR1 &= 0XF7;
PC_CR2 |= 0X08;
}
/*上升沿和下降沿促发*/
void Init_EXTI2(void)
{
EXTI_CR1 |= 0x30;
}
main()
{
_asm("sim");
Init_CLK();
Init_GPIO();
Init_EXTI2_GPIO();
Init_EXTI2();
Init_TIM1();
_asm("rim");
while (1);
}
/*外部中断唤醒*/
@far @interrupt void EXTI2_Hand_Fun(void)
{
}
/*定时器中断函数*/
@far @interrupt void TIM1_UPD_OVF_TRG_BRK_IRQHandler(void)
{
static unsigned int i = 0;
TIM1_SR1 &=~(0x01);
++i;
if(0 == (i%50))
{
LED1 = ~LED1;
LED2 = ~LED2;
LED3 = ~LED3;
LED4 = ~LED4;
}
if(i > 1000)
{
_asm("halt");
i = 0;
LED5 = ~LED5;
}
}
stm8_interrupt_vector.c
1
2
/* BASIC INTERRUPT VECTOR TABLE FOR STM8 devices
* Copyright (c) 2007 STMicroelectronics
*/
typedef void @far (*interrupt_handler_t)(void);
struct interrupt_vector {
unsigned char interrupt_instruction;
interrupt_handler_t interrupt_handler;
};
@far @interrupt void NonHandledInterrupt (void)
{
/* in order to detect unexpected events during development,
it is recommended to set a breakpoint on the following instruction
*/
return;
}
extern void _stext(); /* startup routine */
extern @far @interrupt void EXTI2_Hand_Fun(void);
extern @far @interrupt void TIM1_UPD_OVF_TRG_BRK_IRQHandler(void);
struct interrupt_vector const _vectab[] = {
{0x82, (interrupt_handler_t)_stext}, /* reset */
{0x82, NonHandledInterrupt}, /* trap */
{0x82, NonHandledInterrupt}, /* irq0 */
{0x82, NonHandledInterrupt}, /* irq1 */
{0x82, NonHandledInterrupt}, /* irq2 */
{0x82, NonHandledInterrupt}, /* irq3 */
{0x82, NonHandledInterrupt}, /* irq4 */
{0x82, EXTI2_Hand_Fun}, /* irq5 */
{0x82, NonHandledInterrupt}, /* irq6 */
{0x82, NonHandledInterrupt}, /* irq7 */
{0x82, NonHandledInterrupt}, /* irq8 */
{0x82, NonHandledInterrupt}, /* irq9 */
{0x82, NonHandledInterrupt}, /* irq10 */
{0x82, TIM1_UPD_OVF_TRG_BRK_IRQHandler}, /* irq11 */
{0x82, NonHandledInterrupt}, /* irq12 */
{0x82, NonHandledInterrupt}, /* irq13 */
{0x82, NonHandledInterrupt}, /* irq14 */
{0x82, NonHandledInterrupt}, /* irq15 */
{0x82, NonHandledInterrupt}, /* irq16 */
{0x82, NonHandledInterrupt}, /* irq17 */
{0x82, NonHandledInterrupt}, /* irq18 */
{0x82, NonHandledInterrupt}, /* irq19 */
{0x82, NonHandledInterrupt}, /* irq20 */
{0x82, NonHandledInterrupt}, /* irq21 */
{0x82, NonHandledInterrupt}, /* irq22 */
{0x82, NonHandledInterrupt}, /* irq23 */
{0x82, NonHandledInterrupt}, /* irq24 */
{0x82, NonHandledInterrupt}, /* irq25 */
{0x82, NonHandledInterrupt}, /* irq26 */
{0x82, NonHandledInterrupt}, /* irq27 */
{0x82, NonHandledInterrupt}, /* irq28 */
{0x82, NonHandledInterrupt}, /* irq29 */
};
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