st2024c Sitronix Technology Corporation, st2024c Datasheet - Page 51

• Manufacturer Part Number: st2024c
• Description: 24k 8-bit Single Chip Microcontroller
• Manufacturer: Sitronix Technology Corporation

Ver 2.2
10
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12 Make sure timer counting correct ﹒
13 Make sure temperature counting correct ﹒
14 Make sure software key de-bounce work ﹒（ 10 ~ 50 mS ）
15 Make sure calendar counting correct ﹒（ include user setting ）
16 Make sure stack memory will not overflow ﹒
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18 Please use same parts when developing and producing ﹒
19 Please select general parts for production.
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23 Make sure LCD contrast is controlled by LCTL[3~0].
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28 After Power on ,enter wait 0 mode 0.5s before normal operation
1 After power on ， initial user RAM and confirm control register ﹒
2 Confirm LCD panel’s V
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5 Make sure power down mode work ﹒
6 Calculate average operating current ﹒（ Wake up time ratio ）
7 Confirm I/O directions and set pull-up for un-used input pins ﹒
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9
Project name
Confirm the difference between E.V. Board and real chip （ ex.
V
Before entry power down mode ， turn off un-used peripheral.
（ LCD driver 、 PSG 、 OSC or OSCX ）
For input mode with pull-up function ， Please set bit 7 of port condition control
register （ PMCR[7] ） and each bit of port data register ﹒
If use I/O for pin option ， please re-configure I/O status after reading ﹒
（ directions and pull-up resistor ）
Pay attention to“bit instructions” ， because some registers have different
function for read and write acting. ex. PA 、 PB 、 PRS 、 SYS and control
register for write only ﹒
Disable un-used function’s control register and put“RTI”Instruction at
un-used interrupt vector ﹒
Under test mode ， every functions / parts must be tested ﹒ ex. LCD 、 LED 、
speaker / buzzer 、 key 、 motor and sensor…etc.
When testing ， write every unusual situation down and find out the reasons
indeed.
Make sure the program accept un-normal operatings and system will not
hold or crash down ﹒
When you set I/O port as input mode ， please make sure signal level stable
before reading ﹒ ex. When key scan ， please delay 12 uS then get key code ﹒
If PSG output (PB0 & PB1) wiring a buzzer or speaker, set it to output high
even the PSG isn’t working.
Make sure resister of R-OSC on EV-Chip matches desired frequency and
equals the crytal on EV-Board.
If LCD clock source is from R-OSC, LCD will have no clock in WAI1 and
can’t display.
Always disable interrupt function(by an “ SEI ” instruction) when modify the
IENAL,IENAH,IREQL and IREQH register
OP
、 driving strength 、 F
OP
OSC
（ contrast level ）、 Duty and Bias ﹒
Confirmed Item
、 power consumption 、 noise…etc. ）
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Check
ST2024C
Note
1/31/08