Silan

Semiconductors

SC3423

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

8

The high-order 8-digit of a calculation result is indicated together with "E". The location of the decimal

point corresponds to the result of calculation times le-8, and no zero shift is performed.

c). Error Release

i) System error: A system error can be released by depressing ON/AC key.

ii) Rough Estimate Calculation result: A rough estimate calculation error can be released by depressing the

ON/AC or CE/C key. However the calculation result is not cleared by CE/C key but is retained.

4. OPERATION CHARACTERISTICS

a) Constant Operation

The SC3423 has implied constant mode on +, -, x,

÷, &, % operations. The constant is performed

automatically by the "=" key, "%" key, or "%" key without a constant for addition, subtraction and division

while the first operand is the constant for multiplication.

b) Number Entry

Numbericals can be entered up to 8-digit. Entries equal to 9-digit or more are ignored.

c) Memory Protection

In any error detection, the memory contents present before the error detection are protected.

d) Memory Indication

If the memory contents are a number other than zero, "M" is indicated in the sign-digit position.

e) Auto Power Off

If no key is depressed for a specific period of time, the power supply will automatically turn off. This time

interval up to power-off is 131,072 words (Approximately equal to 14 minutes and 24 seconds at Fd= 52 Hz,

the display time of a word being equal to 6ms when Fd= 52 Hz).

1/Fd

3V

1.5V

0V

(3 Word cycles)

Output waveform example

f) Double Key Depression

The order of priority, when two keys are depressed simultaneously is as follows :

OFF -> ON/AC -> CE/C -> 5 -> 6 -> 4 -> ROM -> · -> 9

>M+->=->+/- -> CE ->+->M- ->% -> RM

x <-

<- <-0<- 1<- 3 < - 2<- CM <-7 <- 8 <--

<

·

·

g) Key Bounce Protection

- Font edge: Down to l word and up to about 3 words.

- Back edge: 14 words.