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| 型號(hào)： | HMS81C43XX |
| 廠商： | Hynix Semiconductor Inc. |
| 英文描述： | CMOS SINGLE-CHIP 8-BIT MICROCONTROLLER FOR TELEVISION |
| 中文描述： | CMOS單芯片8位單片機(jī)電視 |
| 文件頁數(shù)： | 43/100頁 |
| 文件大小： | 1943K |
| 代理商： | HMS81C43XX |
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HMS81C43xx / GMS87C4060
43
November 2001 ver 1.2
12. A/D Converter
The A/D convertor circuit is shown in Figure 12-1 .
The A/D convertor circuit consists of the comparator and
control register AIPS(00EF
H
), ADCM(00F0
H
),
ADR(00F1
H
). The AIPS register select normal port or an-
alog input. The ADCM register control A/D converter’s
activity. The ADR register stores A/D converted 8bit re-
sult. The more details are shown Figure 12-2 .
Figure 12-1 Block Diagram of A/D convertor circuit
Control
The HMS81C43xx/GMS87C4060 contains a A/D con-
verter module which has six analog inputs.
1. First of all, you have to select analog input pin by set the
ADCM and AIPS.
2. Set ADEN (A/D enable bit : ADCM bit5).
3. Set ADST (A/D start bit : ADCM bit1). We recommend
you do not set ADEN and ADST at once, it makes worse
A/D converted result.
4. ADST bit will be cleared automatically 1cycle after you
set this.
Example:
:
; Set AIPS, change to what you want
;
0 : digital port
;
1 : analog port
LDM AIPS,#00b
; Set ADEN, xxx is analog port number
LDM ADCM,#001xxx00b
; or “SET1 ADEN”
; Set ADST, xxx is analog port number
LDM ADCM,#001xxx10b
; or “SET1 ADST”
:
:
5. After A/D conversion is completed, ADSF bit and inter-
rupt flag IFA will be set. (A/D conversion takes 36 ma-
chine cycle : 9uS when f
ex
=8MHz).
Note:
Make sure AIPS bits, if you using a port which is set
digital input by AIPS, analog voltage will be flow into MCU
internal logic not A/D converter. Sometimes device or port
is damaged permanently.
Comparator
AN0
AN1
AN2
AN3
AN4
AN5
MUX
port
select
+
S/H
ADCM [F0
H
]
ADEN ADS2 ADS1 ADS0 ADST ADSF
ADR [F1
H
]
Control circuit
Register ladder
Succesive
Approximation
Circuit
IFA
Vref
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| HMS81C4460 | 制造商:HYNIX 制造商全稱:Hynix Semiconductor 功能描述:HYNIX SEMICONDUCTOR INC. 8-BIT SINGLE-CHIP MICROCONTROLLERS |
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