- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄385400 > HT48R30A (Holtek Semiconductor Inc.) 8-BIT MICROCONTROLLER PDF資料下載
參數(shù)資料
| 型號： | HT48R30A |
| 廠商： | Holtek Semiconductor Inc. |
| 元件分類： | 數(shù)學(xué)處理器 |
| 英文描述： | 8-BIT MICROCONTROLLER |
| 中文描述： | 8位微控制器 |
| 文件頁數(shù)： | 18/43頁 |
| 文件大小： | 710K |
| 代理商： | HT48R30A |
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頁當(dāng)前第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
HT48R30A-1
Rev. 1.10
18
July 2, 2001
There are 2 registers related to the timer/event
counter;TMR([0DH]),TMRC([0EH]).Twophys-
ical registers are mapped to TMR location; writ-
ing TMR makes the starting value be placed in
the timer/event counter preload register and
reading TMR gets the contents of the timer/event
counter. The TMRC is a timer/event counter con-
trol register, which defines some options.
The TM0, TM1 bits define the operating mode.
The event count mode is used to count external
events, which means the clock source comes
from an external (TMR) pin. The timer mode
functions as a normal timer with the clock
source coming from the f
INT
clock or RTC clock.
The pulse width measurement mode can be used
tocountthehighorlowleveldurationoftheexter-
nal signal. The counting is based on the f
INT
clock
or RTC clock.
In the event count or timer mode, once the
timer/event counter starts counting, it will count
from the current contents in the timer/event
counter to FFH. Once overflow occurs, the coun-
ter is reloaded from the timer/event counter
preload register and generates the interrupt re-
quest flag (TF; bit 5 of INTC) at the same time.
In the pulse width measurement mode with the
TON and TE bits equal to one, once the ow to
high (or high to low if the TE bits is "0") it will
start counting until the TMR returns to the
original level and resets the TON. The mea-
sured result will remain in the timer/event
counter even if the activated transient occurs
again. In other words, only one cycle measure-
ment can be done. Until setting the TON, the
cycle measurement will function again as long
asitreceivesfurthertransientpulse.Notethat,
in this operating mode, the timer/event counter
starts counting not according to the logic level
but according to the transient edges. In the case
of counter overflows, the counter is reloaded
from the timer/event counter preload register
and issues the interrupt request just like the
other two modes. To enable the counting opera-
tion, the timer ON bit (TON; bit 4 of TMRC)
should be set to 1. In the pulse width measure-
ment mode, the TON will be cleared automati-
cally after the measurement cycle is completed.
But in the other two modes the TON can only be
reset by instructions. The overflow of the
timer/event counter 0/1 is one of the wake-up
sources. No matter what the operation mode is,
writing a 0 to ETI can disable the correspond-
ing interrupt services.
In the case of timer/event counter OFF condi-
tion, writing data to the timer/event counter
preload register will also reload that data to
the timer/event counter. But if the timer/event
counter is turned on, data written to it will only
be kept in the timer/event counter preload reg-
ister. The timer/event counter will still operate
until overflow occurs (a timer/event counter re-
loading will occur at the same time). When the
timer/event counter (reading TMR) is read, the
clock will be blocked to avoid errors. As clock
blocking may results in a counting error, this
mustbetakenintoconsiderationbytheprogram-
mer.
The bit0~bit2 of the TMRC can be used to de-
fine the pre-scaling stages of the internal clock
sources of timer/event counter. The definitions
are as shown. The overflow signal of
timer/event counter can be used to generate
PFD signals for buzzer driving.
Input/output ports
There are 25 bidirectional input/output lines in
the microcontroller, labeled from PA to PC and
PG, which are mapped to the data memory of
[12H], [14H], [16H] and [1EH] respectively. All of
these I/O ports can be used for input and output
operations. For input operation, these ports are
non-latching, that is, the inputs must be ready at
the T2 rising edge of instruction "MOV A,[m]"
(m=12H, 14H, 16H or 1EH). For output opera-
tion, all the data is latched and remains un-
changed until the output latch is rewritten.
Each I/O line has its own control register (PAC,
PBC, PCC, PGC) to control the input/output
configuration. With this control register,
CMOS output or Schmitt trigger input with or
without pull-high resistor structures can be re-
configured dynamically (i.e. on-the-fly) under
software control. To function as an input, the
corresponding latch of the control register must
write "1". The input source also depends on the
control register. If the control register bit is "1",
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HT48R31-1 | 8-bit OTP Microcontrollers |
| HT48R31-2 | 8-bit OTP Microcontrollers |
| HT48R50-2(40DIP-A0) | 8-BIT MICROCONTROLLER |
| HT48R50-1(28SKDIP-H0) | 8-BIT MICROCONTROLLER |
| HT48R50-1(40DIP-A0) | 8-BIT MICROCONTROLLER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HT48R30A-1 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:I/O Type 8-Bit MCU |
| HT48R30A-1_09 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:I/O Type 8-Bit MCU |
| HT48R31 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:8-Bit Microcontroller Series |
| HT48R31(18DIP-A0) | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| HT48R31(20DIP-F0) | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。