Some important thing for operation mode switching
I) As operation mode switching user must be every carefully about some function will be
disabled or hold.
Single clock system
Operation mode
CPU
OSC
Melody
LCD
Speech
Dual clock system
Operation mode
CPU
OSC.(high freq.)
OSC.(low freq.)
Melody
LCD
Speech
Normal
Running
Running
Running
Running
Running
Running
Slow
Running
Stop
Running
Disable
Running
Disable
Idle
Stop
Stop
Running
Disable
Hold
Disable
Stop
Stop
Stop
Stop
Disable
Disable
Disable
Normal
Running
Running
Running
Running
Running
Sleep
Stop
Stop
Disable
Disable
Disable
Hold
Stop
Running
Disable
Disable
Disable
II) As usual condition, operation mode switch from Slow to Normal only need to output
command number to P22. But there is a special condition for EM73A88,A83,983,883 must be
noticed by programmer. If you want to enable speech or melody just as you switch the
operation mode from slow to normal. Please refer to the following example. It will show you
the best way to ensure the correct result.
*********************************************************************************
ORG 010h;
;
B_RET:
;
LD_SPECH:
RET;
:
:
RET;
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