參數(shù)資料
型號(hào)： M34508G4H-XXXFP
元件分類： 微控制器/微處理器
英文描述： 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PDSO20
封裝： 5.30 X12.60 MM, 1.27 MM PITCH, PLASTIC, SOP-20
文件頁(yè)數(shù)： 72/106頁(yè)
文件大?。?/td> 1059K
代理商： M34508G4H-XXXFP
Rev.1.03
2009.07.27
page 66 of 140
REJ03B0148-0103
4508 Group
Fig. 62 Analog input external circuit example-1
Fig. 63 Analog input external circuit example-2
LA
8
; (02)
TV2A
; The SNZAD instruction is valid ........
LA
0
; (02)
TQ1A
; Operation mode of A/D converter is
changed from comparator mode to A/D
conversion mode.
SNZAD
NOP
: this bit is not related to change the operation
mode of A/D converter.
Fig. 61 External 0 interrupt program example-3
Notes for the use of A/D conversion 1
TALA instruction
When the TALA instruction is executed, the low-order 2 bits of reg-
ister AD is transferred to the high-order 2 bits of register A,
simultaneously, the low-order 2 bits of register A is “0.”
Do not change the operating mode (both A/D conversion mode and
comparator mode) of A/D converter with the bit 3 of register Q1
while the A/D converter is operating.
Clear the bit 2 of register V2 to “0” to change the operating mode
from the comparator mode to A/D conversion mode.
The A/D conversion completion flag (ADF) may be set when the
operating mode of the A/D converter is changed from the compara-
tor mode to the A/D conversion mode. Accordingly, set a value to
the bit 3 of register Q1, and execute the SNZAD instruction to clear
the ADF flag.
Sensor
AIN
Apply the voltage withiin the specifications
to an analog input pin.
Sensor
AIN
About 1k
Notes for the use of A/D conversion 2
Each analog input pin is equipped with a capacitor which is used to
compare the analog voltage. Accordingly, when the analog voltage
is input from the circuit with high-impedance and, charge/dis-
charge noise is generated and the sufficient A/D accuracy may not
be obtained. Therefore, reduce the impedance or, connect a ca-
pacitor (0.01 F to 1 F) to analog input pins (Figure 62).
When the overvoltage applied to the A/D conversion circuit may
occur, connect an external circuit in order to keep the voltage
within the rated range as shown the Figure 61. In addition, test the
application products sufficiently.
22
23
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