DMP Electronics eBOX-3350MX-AP Uživatelský manuál stáhnout pdf (Strana 68)

Jan Yin Chan Electronics Co.,LTD. 386SX Single Chip PC

M6117D : System on a chip

DM&P

Jan Yin Chan Electronics Co,. LTD. M6117D 386SX Single Chip PC Page 67

8F-1,No.22,Wuchyuan 2RD.,Hsin Chuang city Taipei Hsien, Taiwan, R.O.C. Tel: 886-(02) 2298-0770 Fax: (02) 2299-1883

Example 2 : External Switch

LPORTW(056h,084h); /* Enable SMI and PMU function */

LPORTW(067h,003h); /* Set external switch both low-to-high and high-to-low active */

LPORTW(058h,000h); /* Clear external switch */

LPORTW(058h,040h); /* Enable external switch */

/* SMI is generated when external switch is pushed */

/* Wait for the assertion of SMIACKJ */

LPORTR(05Bh); /* To find out the SMI event is caused by which time-out event */

/* It should be the external switch active in this example */

LPORTR(067h); /* Check the external switch status */

/* Start SMI routine */

LPORTW(058h,000h); /* Clear external switch */

LPORTW(058h,040h); /* Enable external switch */

LPORTW(05Ah,080h); /* Set IN(standard input) as a wake-up event */

LPORTW(056h,084h); /* Enable SMI again */

DB 0D6h /* End SMI routine */

DB 0E6h /* RETPM */

Example 3: Usage of the IN Group

IN group is used to monitor the activity of the standard input devices.

IN group is defined as:

IRQ1: default for keyboard

IRQ12: optional for PS/2 mouse ( index 66_D5)

IRQ4: optional for COM1 mouse ( index 66_D6)

IRQ3: optional for COM2 mouse ( index 66_D7)

IN group timer time-out:

(1) Generate power control signal to turn off the screen

(2) Enter SMM by asserting SMIJ

IN group access:

(1) Generate power control signal to turn on the screen

(2) Enter SMM by asserting SMIJ

Hence, monitoring the IN group activity can be used to implement the function of the

creen saver”. Besides, it will not

impact the performance of the running program, instead the whole power can be reduced dramatically.

Example 4

: Software SMI Event

LPORTW(0x56,0xC4); /* Enable SMI and PMU function, and enable software SMI */

/* SMIJ is asserted */

/* Wait for the assertion of SMIADSJ */

LPORTR(0x5B); /* Read SMI cause, it should be software SMI */

LPORTW(0x56,0x04); /* Deassert SMIJ */

/* Start SMI routine */

LPORTW(0x56,0x84); /* Enable SMI again */

DB 0D6h; /* End SMI routine */

DB 0E6h; /* RETPM */

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