- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄370459 > HD404394S (Hitachi,Ltd.) 4-bit HMCS400-series microcomputer(4位單片微計(jì)算機(jī)) PDF資料下載
參數(shù)資料
| 型號(hào)： | HD404394S |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | 4-bit HMCS400-series microcomputer(4位單片微計(jì)算機(jī)) |
| 中文描述： | 4位HMCS400系列微電腦（4位單片微計(jì)算機(jī)） |
| 文件頁數(shù)： | 73/100頁 |
| 文件大?。?/td> | 610K |
| 代理商： | HD404394S |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁當(dāng)前第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁
HD404344R Series/HD404394 Series
73
A/D Converter
The MCU has a built-in A/D converter that uses a sequential comparison method with a register ladder. It
can perform a digital conversion with 3 or 4 analog inputs at 8-bit resolution. The following describes the
features of the A/D converter.
A/D mode register 1 (AMR1: $019) is used to select digital or analog ports (figure 53).
A/D mode register 2 (AMR2: $01A) is used to set the A/D conversion speed (figure 54).
The A/D channel register (ACR: $016) is used to select an analog input channel (figure 55).
A/D conversion is started by setting the A/D start flag (ADSF: $020, bit 2) to 1. After the conversion is
completed, converted data is stored in the A/D data register, and at the same time, the A/D start flag is
cleared to 0 (figure 56).
By setting the I
AD
off flag (IAOF: $021, bit 2) to 1, the current flowing through the resistance ladder
can be cut off even in standby or active mode (figure 57).
A/D data registers (ADRL: $017, ADRU: $018) are read-only registers used to store the conversion
result. (ADRL: lower 4 bits, ADRU: upper 4 bits.) These registers cannot be cleared by a reset input.
Also, data in these registers are not guaranteed during the conversion period. After the conversion is
completed, an 8-bit result is set to these registers and kept until the next conversion starts (figures 58,
59, and 60).
Notes On Use:
Use the SEM or SEMD instruction for writing to the A/D start flag (ADSF).
Do not write to the A/D start flag during A/D conversion.
Data in the A/D data register during A/D conversion is undefined.
Since the operation of the A/D converter is based on the clock from the system oscillator, the A/D
converter does not operate in stop mode. In addition, to save power dissipation while in a stop mode, all
current flowing through the converter’s resistance ladder is cut off.
Output signal level from other ports should be fixed during A/D conversion.
The port data register (PDR) is initialized to 1 by an MCU reset. At this time, if pull-up MOS is selected
as active by bit 3 of the miscellaneous register (MIS3), the port will be pulled up to V
CC
. When using a
shared R port/analog input pin as an input pin, clear PDR to 0. Otherwise, if pull-up MOS is selected by
MIS3 and PDR is set to 1, a pin selected by bit 1 of the A/D mode register as an analog pin will remain
pulled up.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HD404612 | 4-Bit Single-Chip Microcomputer |
| HD404612FS | 4-Bit Single-Chip Microcomputer |
| HD404612H | 4-Bit Single-Chip Microcomputer |
| HD404612TF | 4-Bit Single-Chip Microcomputer |
| HD404614 | 4-Bit Single-Chip Microcomputer |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HD404418F | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller |
| HD404418H | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller |
| HD404418S | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller |
| HD404439FS | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Five timer/counters |
| HD404439H | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Five timer/counters |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。