ST2202A datasheet(73/75 Pages) SITRONIX

73 / 75 page

ROM CODE CHECKLIST

Ver 2.5

73/75

9/16/2008

Project Name

DATE:

ITEM

CHECK

NOTE

1. Check the resistor of R-OSC matches the desired frequency and VCC

2. Check and use the updated version of data sheet

3. After power on, enter wait-1 mode for 1.5 second before normal operation

4. After starting operation, switch OSCX to normal load mode

5. Initialize user RAM and every related control register

Confirm VOP, contrast level, duty, bias, frame rate, alternating rate and the display

quality of LCD

Before entering power down mode, turn off unused peripheral such as LCD

controller, PSG, and LVD

Confirm I/O direction, default state, and function enable bits. Enable pull-up for

unused input pins

Read from an input port after the signals are stable. Ex. when doing key scan,

delay 12 us from a new scan value then read the return lines.

10.

If an input connects to VCC or GND directly, make sure to remove any DC current

from internal pull-up/down resistor after the status is being read.

11.

Do not use bit instructions to registers that are read-only, write-only or have

different functions for read and write.

12. Disable unused functions and reserve “RTI” instruction for unused interrupt vectors

13. Check stack memory is limited within 256 bytes.

14. Design a test mode to check every possible function

15.

Use a ST2202 real chip, together with the emulation mode, to development the

whole system. Test and verify every condition

16.

Settings of Port-L for LCD control signals must include lines below:

STZ

<PL

LDA

#FFh

STA

<PCL

17.

If high frequency was optioned to crystal mode (not RC oscillator), system clock need to be

switched to low frequency (32768Hz) before into WAI1 mode.

Example:

smb7

<SYS

;; Change to OSCX

bbr7

<SYS,$

;; Wait OSCX stable.

smb6

<SYS

;; OSC OFF

Engineer

Manager

ST2202A Datasheet(PDF) 73 Page - Sitronix Technology Co., Ltd.

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