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參數(shù)資料
| 型號(hào)： | HTVDS84 |
| 廠商： | Holtek Semiconductor Inc. |
| 英文描述： | 8-Bit High Performance Microcontroller With Macro Instruction and Voice Synthesizer and Tone Generator(高性能、8位微控制器，帶宏指令、聲話音成器和聲音發(fā)生器) |
| 中文描述： | 8位高性能微控制器，帶有宏觀指導(dǎo)和語(yǔ)音合成器和音發(fā)生器（高性能，8位微控制器，帶宏指令，聲話音成器和聲音發(fā)生器） |
| 文件頁(yè)數(shù)： | 22/44頁(yè) |
| 文件大小： | 275K |
| 代理商： | HTVDS84 |
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HTVDS84
22
June 7, 2000
Input/output ports
The VDS84 series include four input line and
eight bidirectional input/output lines, labeled
PAand PB which are mapped to the data mem-
ories of [12H], [14H], respectively. PA is input
only, PB can be used as input and output opera-
tions. For input operation, these ports are
non-latched, i.e., the inputs must be ready at
the T2 rising edge of the instruction "MOV A,
[m]" (m=12H, 14H). For output operation, all
the data are latched and remain unchanged un-
til the output latch is rewritten.
PB has its own control register (PBC) to control
the input/output configuration. With a control
register, a CMOS output or schmitt trigger in-
put can be reconfigured dynamically (i.e., on
the fly) under a software control. To function as
an input, the corresponding latch of a control
register must write "1". The pull-high resis-
tance will be automatically exhibited . The in-
put source also depends on the control register.
If the bit of the control register bit is "1", the in-
put will read the pad state. If it is "0", the con-
tents of the latches will move to the internal
bus. The latter is possible only in the
"read-modify-write" instruction. For the output
function, CMOS is the only configuration.
These control registers are all mapped to loca-
tions [15H]. PA is input only and functions the
same as PB.
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Input/output ports
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