參數(shù)資料
型號(hào)： KS57C2504
廠商： SAMSUNG SEMICONDUCTOR CO. LTD.
元件分類： 4位微控制器
英文描述： 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER
中文描述： 4位單片機(jī)的小型通用紅外遙控器
文件頁數(shù)： 67/94頁
文件大?。?/td> 763K
代理商： KS57C2504
S3C7254
PRODUCT SPECIFICATION
4–67
PORT 1 MODE REGISTER (P1MOD)
P1MOD register settings determine if P1.0 and P1.1
are used for analog or digital input. The P1MOD
register is 4-bit write-only register. P1MOD is
mapped to address FE2H. A reset operation
initializes all P1MOD register values to zero,
configuring P1.0 and P1.1 as a analog input port.
COMPARATOR OPERATION
The comparator compares analog voltage input at
CIN0-CIN1 with an external or internal reference
voltage (V
REF
) that is selected by the CMOD
register. The result is written to the comparison
result register CMPREG at address FD4H. The
comparison result at internal reference is calculated
as follows:
If "1"
Analog input voltage >=V
REF
+ 150 mV
Analog input voltage <= V
REF
– 150 mV
If "0"
To obtain a comparison result, the data must be
read out from the CMPREG register after V
REF
is
updated by changing the CMOD value after a
conversion time has elapsed.
ANALOG INPUT
VOLTAGE (CIN0–1)
REFERENCE
VOLTAGE (V
REF
)
COMPARATOR CLOCK
(CMPCLK, fx/16, fx/128)
COMPARISON
RESULT (CMPREG)
COMPARISON TIME
(CMPCLK x 4)
COMPARISON
END
1
0
COMPARISON
START
UNKNOWN
1
Figure 44. Conversion Characteristics
PROGRAMMING TIP — Programming the Comparator
The following code converts the analog voltage input at the CIN0–CIN1 pins into 4-bit digital code.
BITR
LD
LD
LD
EMB
A,#3H
P1MOD,A
EA,#0CXH
;
;
;
Analog input selection (CIN0–CIN1)
x = 0–F, comparator enable
Internal reference, conversion time (15.6 μs at 4.19 MHz)
LD
LD
INCS
JR
LD
LD
CMOD,EA
A,#0H
A
WAIT
A,CMPREG
P2,A
WAIT
;
;
Read the result
Output the result from port 2
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