- 您現在的位置：買賣IC網 > PDF目錄385399 > HT47C20L (Holtek Semiconductor Inc.) 8-BIT MICROCONTROLLER PDF資料下載
參數資料
| 型號： | HT47C20L |
| 廠商： | Holtek Semiconductor Inc. |
| 元件分類： | 數學處理器 |
| 英文描述： | 8-BIT MICROCONTROLLER |
| 中文描述： | 8位微控制器 |
| 文件頁數： | 24/55頁 |
| 文件大?。?/td> | 341K |
| 代理商： | HT47C20L |
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頁當前第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
HT47C20L
24
January 18, 2000
Label
(ADCR)
Bits
Function
OVB/OVA
0
In the RC type A/D converter mode, this bit is used to define the timer/event
counter interrupt which comes from timer A overflow or timer B overflow.
(0= timer A overflow; 1= timer B overflow)
In the timer/event counter mode, this bit is void.
ADC/TM
1
To define 16-bit timer/event counter or RC type A/D converter is enable.
(0= timer/event counter enable; 1= A/D converter is enable)
2~3 Unused bits, read as 0
M0
M1
M2
M3
4
5
6
7
To define the A/D converter operating mode (M3, M2, M1, M0)
0000= IN0 external clock input mode
0001= RS0~CS0 oscillation (reference resistor and reference capacitor)
0010= RT0~CS0 oscillation (resistor sensor and reference capacitor)
0011= CRT0~CS0 oscillation (resistor sensor and reference capacitor)
0100= RS0~CRT0 oscillation (reference resistor and sensor capacitor)
0101= RS1~CS1 oscillation (reference resistor and reference capacitor)
0110= RT1~CS1 oscillation (resistor sensor and reference capacitor)
0111= IN1 external clock input mode
1XXX= Undefined mode
ADCR register
A/D converter
Two channels of RC type A/D converter are im-
plemented in the HT47C20L. The A/D con-
verter contains two 16-bit programmable
count-up counter and the timer A clock source
may come from the system clock, T1 (system
clock/4) or real time clock output. The timer B
clock source may come from the external RC os-
cillator. The TMRAL, TMRAH, TMRBL,
TMRBH are composed of the A/D converter when
ADC/TM bit (bit 1 of ADCR register) is 1 .
The A/D converter timer B clock source may
come from channel 0 (IN0 external clock input
mode, RS0~CS0 oscillation, RT0~CS0 oscilla-
tion, CRT0~CS0 oscillation (CRT0 is a resis-
tor), or RS0~CRT0 oscillation (CRT0 is a
capacitor) or channel 1 (RS1~CS1 oscillation,
RT1~CS1 oscillation or IN1 external clock in-
put). The timer A clock source is from the sys-
tem clock, T1 or real time clock prescaler clock
output decided by TMRC register.
There are six registers related to A/D converter,
i.e., TMRAH, TMRAL, TMRC, TMRBH, TMRBL
and ADCR. The internal timer clock is input to
TMRAH and TMRAL, the A/D clock is input to
TMRBH and TMRBL. The OVB/OVA bit (bit 0
of the ADCR register) decides whether timer A
overflows or timer B overflows, then the TF bit
is set and timer interrupt occurs. When the A/D
converter mode timer A or timer B overflows,
the TON bit is reset and stop counting. Writing
TMRAH/TMRBH puts the starting value in the
timer A/timer B and reading TMRAH/TMRBH
gets the contents of the timer A/timer B. Writ-
ing TMRAL/TMRBL only writes the data into a
low byte buffer, and writing TMRAH/TMRBH
will write the data and the contents of the low
byte buffer into the timer A/timer B (16-bit) si-
multaneously. The timer A/timer B is change by
writing TMRAH/TMRBH operations and writing
TMRAL/TMRBL will keep the timer A/timer B
unchanged.
Reading TMRAH/TMRBH will also latch the
TMRAL/TMRBL into the low byte buffer to
avoid the false timing problem. Reading
TMRAL/TMRBL returns the contents of the
low byte buffer. In other word, the low byte of
timer A/timer B can not be read directly. It
must read the TMRAH/TMRBH first to make
the low byte contents of timer A/timer B be
latched into the buffer.
相關PDF資料 |
PDF描述 |
|---|---|
| HT47C20 | 8-BIT MICROCONTROLLER |
| HT47R20 | 8 位R-F 型OTP 單片機 |
| HT48C05 | Cost-Effective I/O Type 8-Bit MCU |
| HT48C06 | Cost-Effective I/O Type 8-Bit MCU |
| HT48C10-1 | 8-Bit High Performance RISC-like Microcontroller Suitable for Multiple I/O Application(高性能、指令類似RISC的8位微控制器，用于多I/O接口設備) |
相關代理商/技術參數 |
參數描述 |
|---|---|
| HT47C20L_05 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:R-F Type Low Voltage 8-Bit Mask MCU |
| HT47M50 | 制造商:NTE Electronics 功能描述: |
| HT47R10A-1 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:R-F Type 8-Bit MCU |
| HT47R20 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:8 位R-F 型OTP 單片機 |
| HT47R20A-1 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:R-F Type 8-Bit MCU |
發(fā)布緊急采購，3分鐘左右您將得到回復。