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參數(shù)資料
| 型號： | HT95A20P |
| 廠商： | Holtek Semiconductor Inc. |
| 英文描述： | 8-Bit LCD Type Phone Controller MCU |
| 中文描述： | 8位LCD型電話MCU控制器 |
| 文件頁數(shù)： | 17/42頁 |
| 文件大?。?/td> | 768K |
| 代理商： | HT95A20P |
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HT95L100/10P
Rev. 0.10
17
October 1, 2002
Preliminary
Timer/Event Counter 0 and is defined by TMR1C. The
timer/event counter control registers define the operat-
ing mode, counting enable or disable and active edge.
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
(TMR0 or INT/TMR1) pin. The timer mode functions as
a normal timer with the clock source coming from in-
struction clock (TMR0) or 32768Hz (TMR1). The pulse
width measurement mode can be used to count the high
or low level duration of the external signal (TMR0 or
INT/TMR1). The counting is based on the 32768Hz
clock for TMR1 or instruction clock for TMR0.
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 FFFFH. If an over-
flow occurs, the counter is reloaded from the timer/event
counter preload register and generates the correspond-
ing interrupt request flag (T0F/T1F) at the same time.
In pulse width measurement mode with the TON and TE
bits equal to 1, once the TMR0/TMR1 pin has received a
transient from low to high (or high to low; if the TE bit is
0) it will start counting until the TMR0/TMR1 pin returns
to the original level and resets the TON. The measured
result will remain in the timer/event counter even if the
activated transient occurs again. In other words, only 1
cycle measurement can be done. Until setting the TON,
the cycle measurement will function again as long as it
receives further transient pulse. Note that, in this operat-
ing 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 continue to measure the width and issues the inter-
rupt request just like the other two modes.
To enable the counting operation, the timer on bit (TON)
should be set to 1. In the pulse width measurement
mode, the TON will be cleared automatically after the
measurement cycle is completed. But in the other two
modes the TON can only be reset by instruction. The
overflow of the timer/event counter is one of the
wake-up sources. No matter what the operation mode
is, writing a 0 to ET0I/ET1I can disable the correspond-
ing interrupt service.
In the case of timer/event counter off condition, writing
data to the timer/event counter preload register also re-
loads that data to the timer/event counter. But if the
timer/event counter is turned on, data written to the
timer/event counter is reserved only in the timer/event
counter preload register. The timer/event counter will go
on operating until an overflow occurs.
Input/output ports
There are 20 bidirectional input/output lines in the tele-
phone controller, labeled as PA, PB and PE. 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 instruc-
tion MOV A,[m] (m=12H, 14H or 1AH). For output op-
eration, all the data is latched and remains unchanged
until the output latch is rewritten.
Each I/O line has its own control register (PAC,PBC,
PEC) to control the input/output configuration. With this
control register, CMOS output or Schmitt trigger input
canbereconfigureddynamicallyundersoftwarecontrol.
To make one I/O line to function as an input line, the cor-
responding latch of the control register must be written
with a 1 . The pull-high resistance shows itself auto-
matically if the pull-high option is selected. The input
source also depends on the control register. If the con-
trol register bit is 1 , the input will read the pad state. If
the control register bit is 0 , the contents of the latches
will move to the internal bus. The latter is possible in the
read-modify-write
CMOS is the only configuration. Each bit of these in-
instruction. For output function,
put/output latches can be set or cleared by SET [m].i
and CLR [m].i (m=12H, 14H or 1AH) instructions.
Some instructions first input data and then follow the
output operations. For example,
SET [m].i ,
CLR
[m].i , CPL [m] , CPLA [m] read the entire port states
into the CPU, execute the defined operations
(bit-operation), and then write the results back to the
latches or the accumulator.
Each line of port A has the capability of waking-up the
There is a pull-high option available for all I/O lines.
Once the pull-high option of an I/O line is selected, the
I/O lines have pull-high resistor. Otherwise, the pull-high
resistor is absent. It should be noted that a non-pull-high
I/O line operating in input mode may cause a floating
state.
I/O port pull-high, wake-up function are selected by
mask option
I/O
Port
Output
Input
Pull-high
Resistor
Wake-up
Function
PA
CMOS
Selected per bit
Selected
per bit
PB
CMOS
Selected per bit
X
PE
CMOS
Selected per nibble
X
Note: X: unavailable
The PE0~PE3 and SEG16~SEG19 share the same
pads. They can be selected per nibble by software op-
tion at any time.
When the PE0~PE3 are not selected, the I/O port con-
trol register, PEC (1BH) could be read/write-able and be
used as a general user RAM, but this function is not
available for register PE (1AH).
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| HT95L300-100QEP-A | LCD Type Phone 8-Bit MCU |
| HT95A400 | Time-Delay Relay; Mounting Type:Plug In; Relay Mounting:Plug-In |
| HT95A100 | I/O Type Phone 8-Bit MCU |
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相關代理商/技術參數(shù) |
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| HT95A300 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:I/O Type Phone 8-Bit MCU |
| HT95A300/30P | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:I/O Type Phone 8-Bit MCU |
| HT95A30P | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:CID Type Phone 8-Bit MCU |
| HT95A400 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:I/O Type Phone 8-Bit MCU |
| HT95A400/40P | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:I/O Type Phone 8-Bit MCU |
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