參數(shù)資料
型號(hào)： S3C1850XX-SM
元件分類： 微控制器/微處理器
英文描述： 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PDSO24
封裝： 0.375 INCH, SOP-24
文件頁(yè)數(shù)： 65/89頁(yè)
文件大?。?/td> 323K
代理商： S3C1850XX-SM
S3C1840/C1850/C1860/P1860
REMOTE CONTROL TX. APPLICATION NOTE
7-17
S3C1840/C1850 KEYSCAN FUNCTION
Description
This program has an 8 x 9 key matrix, which consists of input P0 and P1 and output P2 and P3. Because pull-up
resistors are connected, the normal state for all input pins is high level. The operating method for the keyscan
function is as follows:
— All output pins remain active state ( = low).
— If key is pressed, set all output pins to non-active state and rotate the pins to set only a pin to active state
during debounce time.
— If key is pressed more than one or if no key is pressed, go to reset label.
— If a new key is pressed, reset debounce time, continuous flag, and key-in flag.
RAM Assignment
O_INP0
N_INP0
O_INP1
N_INP1
O_OUTP
I_TWICE
N_OUTP
DEBOCNT CONKEY
KFLG
05H
09H
H register selects #0
01H
HL
00H
O_INP0:
The old value of P0
N_INP0:
The new value of P0
O_INP1:
The old value of P1
N_INP1:
The new value of P1
O_OUTP:
The old value of output port
N_OUTP:
The new value of output port
I_TWICE:
Double number increment
DEBOCNT: Debounce time
CONKEY:
Continuous key flag
KFLG:
key input flag
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