DMP Electronics eBOX-3350MX-AP Uživatelský manuál stáhnout pdf (Strana 33)

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

DM&P M6117D : System on a chip

Page 32

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

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

4.6 The way to generate system management interrupt

4.6.1 Mode timer time-out

There is a Mode timer in power management unit of M6117D, this is based on 14.318 Mhz frequency input. There are four

time bases 1 sec, 10 secs, 1 min and 10 mins. The timer counter is from 0 to 15, so the combinations are as follows :

Time Time base

count

1 sec 10 sec 1 min 10 min

0 0 sec 0 sec 0 min 0 mins

1 1 sec 10 secs 1 min 10 mins

2 2 secs 20 secs 2 mins 20 mins

3 3 secs 30 secs 3 mins 30 mins

4 4 secs 40 secs 4 mins 40 mins

5 5 secs 50 secs 5 mins 50 mins

6 6 secs 60 secs 6 mins 60 mins

7 7 secs 70 secs 7 mins 70 mins

8 8 secs 80 secs 8 mins 80 mins

9 9 secs 90 secs 9 mins 90 mins

10 10 secs 100 secs 10 mins 100 mins

11 11 secs 110 secs 11 mins 110 mins

12 12 secs 120 secs 12 mins 120 mins

13 13 secs 130 secs 13 mins 130 mins

14 14 secs 140 secs 14 mins 140 mins

15 15 secs 150 secs 15 mins 150 mins

e.g. There are two possible settings for two minutes, (a) 10 secs time base, time count is 12.

(b) 1 minute time base, time count is 2.

The BIOS should choose the small time base to reduce time shift. In other words, small time base is more precise than

bigger time base.

The configuration register index 64h is the timer setting.

Index 64h

D[7-4] Time count

0000 0

0001 1

0010 2

0011 3

0100 4

0101 5

0110 6

0111 7

1000 8

1001 9

1010 10

1011 11

1100 12

1101 13

1110 14

1111 15

Index 64h

D[2] Timer count/reset

0 Timer reset

1 Timer count

D[1-0] Time base

0 0 1 second

0 1 10 seconds

1 0 1 minute

1 1 10 minutes

Once the mode timer counter is equal to the time count

setting, then the time-out occurs. Time-out will generate a

system management interrupt and index 5Bh will show 06h

to manifest the interrupt cause. Notice that you should set

index 59h : D[5] to ‘1’ to activate mode timer even if you

have already set the index 64h. We can prolong time delay

for double of our time setting by programming index 69h :

D[4] to ‘1’ which is double counter time base control bit.

When timer is enabled, any access to monitored device

range, the corresponding timer will reset and restart

counting until time-out is reached. For instance, mode

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 111 112

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