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參數資料
| 型號： | HT48CA0-2 |
| 廠商： | Holtek Semiconductor Inc. |
| 元件分類： | 微控制器 |
| 英文描述： | Remote Type 8-Bit MCU |
| 中文描述： | 遠程型8位微控制器 |
| 文件頁數： | 9/32頁 |
| 文件大小： | 238K |
| 代理商： | HT48CA0-2 |
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HT48RA0-2/HT48CA0-2
Rev. 1.50
9
July 23, 2004
Carrier
The HT48RA0-2/HT48CA0-2 provides a carrier output
which shares the pin with PC0. It can be selected to be a
carrier output (REM) or level output pin (PC0) by code
option. If the carrier output option is selected, setting
PC0= 0 toenablecarrieroutputandsettingPC0= 1 to
disable it at low level output.
The clock source of the carrier is implemented by in-
struction clock (system clock divided by 4) and pro-
cessed by a frequency divider to yield various carry
frequency.
Carry Frequency=
Clock Source
m 2
n
where m=2 or 3 and n=0~3, both are selected by code
option. If m=2, the duty cycle of the carrier output is 1/2
duty. If m=3, the duty cycle of the carrier output can be
1/2dutyor1/3dutyalsodeterminedbycodeoption(with
the exception of n=0).
Detailed selection of the carrier duty is shown below:
m 2
n
Duty Cycle
2, 4, 8, 16
1/2
3
1/3
6, 12, 24
1/2 or 1/3
The following table shows examples of carrier fre-
quency selection.
f
SYS
f
CARRIER
Duty
m 2
n
455kHz
37.92kHz
1/3 only
3
56.9kHz
1/2 only
2
Input/Output Ports
There are an 8-bit bidirectional input/output port, a 4-bit
input with 2-bit I/O port and one-bit output port in the
HT48RA0-2/HT48CA0-2, labeled PA, PB and PC which
are mapped to [12H], [14H], [16H] of the RAM, respec-
tively. Each bit of PAcan be selected as NMOS output or
Schmitt trigger with pull-high resistor by software in-
struction. PB0~PB1 have the same structure with PA,
while PB2~PB5 can only be used for input operation
(Schmitt trigger with pull-high resistors). PC is only
one-bit output port shares the pin with carrier output. If
the level option is selected, the PC is CMOS output.
Both PA and PB for the input operation, these ports are
non-latched, that is, the inputs should be ready at the T2
rising edge of the instruction MOV A, [m] (m=12H or
14H). For PA, PB0~PB1 and PC output operation, all
data are latched and remain unchanged until the output
latch is rewritten.
When the PA and PB0~PB1 is used for input operation,
it should be noted that before reading data from pads, a
1 should be written to the related bits to disable the
NMOS device. That is, the instruction SET[m].i (i=0~7
for PA, i=0~1 for PB) is executed first to disable related
NMOSdevice,andthen MOVA,[m] togetstabledata.
After chip reset, PA and PB remain at a high level input
line while PC remain at high level output, if the level op-
tion is selected.
Each bit of PA, PB0~PB1 and PC output latches can be
set or cleared by the
(m=12H, 14H or 16H) instructions respectively.
SET [m].i
and
CLR [m].i
Some instructions first input data and then follow the
output operations. For example, SET [m].i , CLR [m] ,
CPL [m] , CPLA [m] read the entire port states into
theCPU,executethedefinedoperations(bit-operation),
and then write the results back to the latches or to the
accumulator.
Each line of PB has a wake-up capability to the device
by code option. The highest seven bits of PC are not
physically implemented, on reading them a 0 is re-
turned and writing results in a no-operation.
Note: The bit 6 and Bit 7 the PB register (14H) are un-
used in the HT48RA0-2/HT48CA0-2, any read from that
will return the value 0 . User Should be very careful in
transferring the program from the HT48RA0A or
HT48RA0-1/HT48CA0-1 device to the HT48RA0-2/
HT48CA0-2 device.
1
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7
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2 : @
#
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,
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1
.
1
Carrier/Level Output
相關PDF資料 |
PDF描述 |
|---|---|
| HT48RA0 | Remote Type 8-Bit MCU |
| HT48RA0-2 | Remote Type 8-Bit MCU |
| HT48CA0 | 8-BIT MICROCONTROLLER |
| HT48CA1 | Remote Type 8-Bit MCU |
| HT48RA1 | Remote Type 8-Bit MCU |
相關代理商/技術參數 |
參數描述 |
|---|---|
| HT48CA0-20DIP-A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| HT48CA0-3 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:Remote Type 8-Bit MCU |
| HT48CA1 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:Remote Type 8-Bit MCU |
| HT48CA3 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:Remote Type 8-Bit MCU |
| HT48CA5 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:Remote Type 8-Bit MCU |
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